U.S. patent application number 16/020416 was filed with the patent office on 2018-10-25 for aluminum alloy housing and preparation method thereof.
The applicant listed for this patent is BYD COMPANY LIMITED. Invention is credited to LIANG CHEN, CHONGCHONG LIAO, XIONG XIONG, ZHIWEN ZHONG.
Application Number | 20180305838 16/020416 |
Document ID | / |
Family ID | 59225599 |
Filed Date | 2018-10-25 |
United States Patent
Application |
20180305838 |
Kind Code |
A1 |
XIONG; XIONG ; et
al. |
October 25, 2018 |
ALUMINUM ALLOY HOUSING AND PREPARATION METHOD THEREOF
Abstract
This disclosure provides an aluminum alloy housing and a
preparation method for same. An external surface of the aluminum
alloy housing has a convex portion and a concave portion, the
convex portion has a convex oxide film and a convex electrophoretic
decorative layer in turn, the concave portion has a concave oxide
film or a concave electrophoretic decorative layer, surface of the
convex electrophoretic decorative layer has a glossiness of 90-105,
and surface of the concave oxide film has a glossiness of 5-25 or
surface of the concave electrophoretic decorative layer has a
glossiness of 0.5-5.
Inventors: |
XIONG; XIONG; (SHENZHEN,
CN) ; LIAO; CHONGCHONG; (SHENZHEN, CN) ; CHEN;
LIANG; (SHENZHEN, CN) ; ZHONG; ZHIWEN;
(SHENZHEN, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
BYD COMPANY LIMITED |
SHENZHEN |
|
CN |
|
|
Family ID: |
59225599 |
Appl. No.: |
16/020416 |
Filed: |
June 27, 2018 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
PCT/CN2016/111568 |
Dec 22, 2016 |
|
|
|
16020416 |
|
|
|
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
C25D 13/22 20130101;
C25D 11/20 20130101; C25D 11/026 20130101; C25D 11/12 20130101;
C25D 11/08 20130101; C25D 11/22 20130101; C25D 13/04 20130101; C25D
11/18 20130101; C25D 13/20 20130101; C25D 11/14 20130101 |
International
Class: |
C25D 13/20 20060101
C25D013/20 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 30, 2015 |
CN |
201511019773.5 |
Claims
1. An aluminum alloy housing, comprising an external surface having
a convex portion and a concave portion, wherein: the convex portion
includes a convex oxide film and a convex electrophoretic
decorative layer, wherein a surface of the convex electrophoretic
decorative layer has a glossiness of 90-105; and the concave
portion includes a concave oxide film or a concave electrophoretic
decorative layer, wherein a surface of the concave oxide film has a
glossiness of 5-25, and a surface of the concave electrophoretic
decorative layer has a glossiness of 0.5-5.
2. The aluminum alloy housing according to claim 1, wherein a
height difference between the convex portion and the concave
portion is 0.05-0.2 mm.
3. The aluminum alloy housing according to claim 1, wherein the
convex oxide film and the concave oxide film have different
colors.
4. A preparation method for an aluminum alloy housing, comprising
steps of: step a: performing first anodic oxidation on a surface of
an aluminum alloy housing substrate; step b: forming a convex
electrophoretic decorative layer on a surface of the aluminum alloy
housing substrate on which the first anodic oxidation has been
performed via first electrophoretic treatment; step c: performing
mechanical polishing on a surface of the aluminum alloy housing
substrate on which the first electrophoretic treatment has been
performed; step d: performing laser carving on a surface of the
aluminum alloy housing substrate on which the mechanical polishing
has been performed, so as to obtain a texture pattern having a
convex-concave effect on the surface of the aluminum alloy housing
substrate; step e: performing a process on portion of the texture
pattern on the surface of the aluminum alloy housing substrate,
wherein the process is selected from the group consisting of:
second electrophoretic treatment, second anodic oxidation, hard
anodic oxidation and micro-arc oxidation.
5. The preparation method according to claim 4, wherein the first
anodic oxidation or the second anodic oxidation comprises
performing pretreatment on the surface of the aluminum alloy
housing substrate and then forming an anode film by anodic
oxidation.
6. The preparation method according to claim 5, wherein the
pretreatment comprises: performing alkali etching for 3-20 s at a
temperature of 50-70.degree. C. by using 50-60 g/L of sodium
hydroxide, neutralizing for 10-20 s a temperature of 15-25.degree.
C. by using 200-300 ml/L of nitric acid, and performing chemical
polishing for 5-20 s at a temperature of 90-95.degree. C. by using
a chemical polishing solution containing 650-750 ml/L of phosphoric
acid and 350-250 ml/L of sulfuric acid.
7. The preparation method according to claim 4, wherein the anodic
oxidation comprises oxidizing the surface of the aluminum alloy
housing substrate for 15-50 min under an anode voltage of 13-17 V
and at a temperature of 10-21.degree. C. by using 190-200 g/L of
sulfuric acid.
8. The preparation method according to claim 4, wherein the first
electrophoretic treatment or the second electrophoretic treatment
comprises electrophoresing for 1-3 min under a voltage of 140-200 V
and at a temperature of 28-32.degree. C. by using an
electrophoresing solution having a pH of 7-9.
9. The preparation method according to claim 4, wherein the hard
anodic oxidation comprises oxidizing for 25-50 min under a
temperature of 5-12.degree. C. by using a hard anodic oxidation
solution.
10. The preparation method according to claim 4, wherein the hard
anodic oxidation solution includes 170-270 g/L of sulfuric acid and
8-20 g/L of oxalic acid.
11. The preparation method according to claim 4, wherein the
micro-arc oxidation includes oxidizing for 40-100 min under a
temperature of 20-30.degree. C. by using a micro-arc oxidation
solution.
12. The preparation method according to claim 4, wherein the
micro-arc oxidation solution includes 0.02-0.05 mol/L of sodium
silicate and 0.03-0.07 mol/L of sodium hydroxide.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application is a continuation application of
International Application No. PCT/CN2016/111568, filed on Dec. 22,
2016, which is based on and claims priority to and benefits of
Chinese Patent Application No. 201511019773.5, filed with the State
Intellectual Property Office (SIPO) of the People's Republic of
China on Dec. 30, 2015. The entire contents of the above referenced
applications are hereby incorporated by reference.
TECHNICAL FIELD
[0002] The present disclosure relates to the field of electronic
product technologies, and in particular, to an aluminum alloy
housing and a preparation method for same.
BACKGROUND
[0003] With the development of electronic technologies,
increasingly more electronic products appear in our life, for
example, mobile phones, tablet computers, and e-readers. Most of
these electronic products use plastic casings. However, as people
have higher requirements on the quality of the electronic products,
more and more electronic products use metal casings. On one hand,
metal casings have better protection effects than plastic casings.
On the other hand, the unique metal texture is also an important
reason why the metal casings are becoming more popular.
[0004] Currently, surface treatment performed on a metal casing of
an electronic product is mainly for the purpose of decorative and
protective effects. In the existing method of performing surface
treatment on a metal casing, anodic oxidation, micro-arc oxidation,
and hard anodic oxidation on the surface of the metal casing can
all achieve the foregoing two effects. However, in terms of the
decorative effect, the metal casing after the treatment lacks
diversity in appearance decoration and textures.
[0005] Therefore, to improve the diversity in appearance decoration
and textures of a metal casing, it is necessary to develop an
aluminum alloy housing that has desirable appearance decoration and
a solid texture, and a preparation method for same.
SUMMARY
[0006] In order to resolve the problem that a mobile phone housing
in the prior art lacks diversity in appearance decoration and
textures, the present disclosure is directed to provide an aluminum
alloy housing and a preparation method for same. The aluminum alloy
housing has a bumpy solid texture and has a glossy convex side and
concave side.
[0007] In order to achieve the foregoing objective, the present
disclosure provides an aluminum alloy housing. According to
embodiments of the present disclosure, an external surface of the
aluminum alloy housing has a convex portion and a concave portion,
the convex portion has a convex oxide film and a convex
electrophoretic decorative layer in turn, the concave portion has a
concave oxide film or a concave electrophoretic decorative layer,
surface of the convex electrophoretic decorative layer has a
glossiness of 90-105, and surface of the concave oxide film has a
glossiness of 5-25 or surface of the concave electrophoretic
decorative layer has a glossiness of 0.5-5.
[0008] Preferably, a height difference between the convex portion
and the concave portion is 0.05-0.2 mm.
[0009] Preferably, the convex oxide film and the concave oxide film
have different colors.
[0010] The present disclosure further provides a preparation method
for an aluminum alloy housing, which includes steps of:
[0011] step a: performing first anodic oxidation on the surface of
the aluminum alloy housing substrate;
[0012] step b: forming a convex electrophoretic decorative layer on
surface of the aluminum alloy housing substrate on which the first
anodic oxidation has been performed via first electrophoretic
treatment;
[0013] step c: performing mechanical polishing on the surface of
the aluminum alloy housing substrate on which the first
electrophoretic treatment has been performed;
[0014] step d: performing laser carving on a surface of the
aluminum alloy housing substrate on which the mechanical polishing
has been performed, so as to obtain a texture pattern having a
convex-concave effect on the surface of the aluminum alloy housing
substrate;
[0015] step e: performing second electrophoretic treatment or
second anodic oxidation or hard anodic oxidation or micro-arc
oxidation on portion of the texture pattern on the surface of the
aluminum alloy housing substrate.
[0016] Preferably, wherein the first anodic oxidation and/or the
second anodic oxidation comprises performing pretreatment on the
surface of the aluminum alloy housing substrate and then forming an
anode film by anodic oxidation.
[0017] Preferably, the pretreatment comprises: performing alkali
etching for 3-20 s at a temperature of 50-70.degree. C. by using
50-60 g/L of sodium hydroxide, neutralizing for 10-20 s a
temperature of 15-25.degree. C. by using 200-300 ml/L of nitric
acid, and performing chemical polishing for 5-20 s at a temperature
of 90-95.degree. C. by using a chemical polishing solution
containing 650-750 ml/L of phosphoric acid and 350-250 ml/L of
sulfuric acid.
[0018] Preferably, the anodic oxidation comprises oxidizing the
surface of the aluminum alloy housing substrate for 15-50 min under
an anode voltage of 13-17 V and at a temperature of 10-21.degree.
C. by using 190-200 g/L of sulfuric acid.
[0019] Preferably, the first electrophoretic treatment and/or the
second electrophoretic treatment comprises electrophoresing for
1-3min under a voltage of 140-200 V and at a temperature of
28-32.degree. C. by using an electrophoresing solution having a pH
of 7-9.
[0020] Preferably, the hard anodic oxidation comprises oxidizing
for 25-50 min under a temperature of 5-12.degree. C. by using a
hard anodic oxidation solution.
[0021] Preferably, the hard anodic oxidation solution includes
170-270 g/L of sulfuric acid and 8-20 g/L of oxalic acid.
[0022] Preferably, the micro-arc oxidation includes oxidizing for
40-100 min under a temperature of 20-30.degree. C. by using a
micro-arc oxidation solution.
[0023] Preferably, the micro-arc oxidation solution includes
0.02-0.05 mol/L of sodium silicate and 0.03-0.07 mol/L of sodium
hydroxide.
[0024] With the foregoing technical solution, first anodic
oxidation is firstly performed on the surface of the aluminum alloy
housing substrate, then a convex electrophoretic decorative layer
is formed via first electrophoretic treatment, and then mechanical
polishing is performed on the surface of the aluminum alloy housing
substrate on which the first electrophoretic treatment has been
performed, then a texture pattern having a convex-concave effect on
the surface of the aluminum alloy housing substrate is formed via
laser carving, next, second electrophoretic treatment or second
anodic oxidation or hard anodic oxidation or micro-arc oxidation is
performed on portion of the texture pattern on the surface of the
aluminum alloy housing substrate, thereby producing an aluminum
alloy housing having a bumpy solid texture and having a glossy
convex side and non-glossy concave side.
[0025] The additional aspects and advantages of the present
disclosure will be provided in the following description, and some
of the additional aspects and advantages will become clear in the
following description or be understood through practice of the
present disclosure.
DETAILED DESCRIPTION
[0026] Specific implementations of the present disclosure are
described in detail below. It should be understood that the
specific implementations described herein are merely used for
illustrating the present disclosure rather than limiting the
present disclosure.
[0027] An aluminum alloy housing is provided according to an
embodiment of the present disclosure. An external surface of the
aluminum alloy housing has a convex portion and a concave portion,
the convex portion has a convex oxide film and a convex
electrophoretic decorative layer in turn, the concave portion has a
concave oxide film or a concave electrophoretic decorative layer,
surface of the convex electrophoretic decorative layer has a
glossiness of 90-105, and surface of the concave oxide film has a
glossiness of 5-25 or surface of the concave electrophoretic
decorative layer has a glossiness of 0.5-5. By forming a convex
portion and a concave portion on the external surface of the
aluminum alloy housing, the aluminum alloy housing can have a bumpy
solid texture. In addition, by polishing the convex oxide film
formed on the surfaces of the convex portion, the surfaces of the
convex oxide film are glossy. In the present disclosure, the
glossiness means how close the surface of the oxide film is to a
mirror surface, and can be measured by using a method commonly
known in the field, for example, measured by using a gloss
meter.
[0028] In the present disclosure, a method for forming a convex
portion and a concave portion on the external surface of the
aluminum alloy housing, and a method for forming a convex oxide
film on the convex portion and forming a concave oxide film on the
concave portion will be described in the following preparation
method for the aluminum alloy housing.
[0029] In the preparation method for the aluminum alloy housing
according to an embodiment of the present disclosure, preferably,
the convex oxide film and the concave oxide film are of different
colors. By making the convex oxide film and the concave oxide film
have different colors, the aluminum alloy housing has film layers
of different colors.
[0030] A preparation method for an aluminum alloy housing according
to an embodiment of the present disclosure sequentially
includes:
[0031] step a: performing first anodic oxidation on the surface of
the aluminum alloy housing substrate;
[0032] step b: forming a convex electrophoretic decorative layer on
surface of the aluminum alloy housing substrate on which the first
anodic oxidation has been performed via first electrophoretic
treatment;
[0033] step c: performing mechanical polishing on the surface of
the aluminum alloy housing substrate on which the first
electrophoretic treatment has been performed;
[0034] step d: performing laser carving on a surface of the
aluminum alloy housing substrate on which the mechanical polishing
has been performed, so as to obtain a texture pattern having a
convex-concave effect on the surface of the aluminum alloy housing
substrate;
[0035] step e: performing second electrophoretic treatment or
second anodic oxidation or hard anodic oxidation or micro-arc
oxidation on portion of the texture pattern on the surface of the
aluminum alloy housing substrate.
[0036] In the preparation method for an aluminum alloy housing
according to the embodiment of the present disclosure, in order to
obtain a glossy effect of the aluminum alloy housing, mechanical
polishing is performed on the surface of the aluminum alloy housing
substrate on which the first electrophoretic treatment has been
performed. The anodic oxidation film layer on the surface of the
aluminum alloy housing substrate is polished by using a mechanical
polishing machine, to reduce the overall thickness of the anodic
oxidation film layer by approximately 2 .mu.m, so that the surface
of the anodic oxidation film is glossy and can reflect light, and a
glossy surface having a high glossiness is formed, and then laser
carving is performed so as to obtain a convex-concave difference on
surface of the aluminum alloy housing substrate, thus to obtain a
bumpy solid texture.
[0037] The aluminum alloy housing substrate used in the present
disclosure is not particularly limited. Various aluminum alloy
housing bodies can be used, for example, a product of industrial
standard 1000-7000 series, a die-casting aluminum alloy, and a
pressure-casting aluminum alloy. The aluminum alloy housing
substrate in the present disclosure is an aluminum alloy housing
body of various shapes and structures that are commonly used by a
person skilled in the art, and is not particularly limited in the
present disclosure. The various shapes and structures of the
aluminum alloy housing substrate can be accomplished by mechanical
processing. The aluminum alloy housing can be used as a housing of
a mobile phone, a tablet computer, an e-reader, or the like.
[0038] In the preparation method for an aluminum alloy housing
according to the embodiment of the present disclosure, in step a,
before first anodic oxidation is performed on the surface of the
aluminum alloy housing substrate, blasting and drawing treatment
can be performed on the surface of the aluminum alloy housing
substrate in advance. In the present disclosure, the blasting can
be performed by using a method commonly known in the field. For
example, after the surface of the aluminum alloy housing substrate
is sanded by using a sander, blasting treatment is performed on the
surface of the aluminum alloy housing substrate by using a ceramic
sand of 80-400 meshes under a pressure of 0.1-0.24 MPa, so that the
surface of the aluminum alloy housing substrate feels sandy. The
drawing treatment can be performed by using a method commonly known
in the field. For example, the surface of the aluminum alloy
housing substrate can be drawn by a drawing machine with No. 400 to
No. 1200 drawing wheels to achieve the required brushed texture
from coarse to fine.
[0039] In the preparation method for an aluminum alloy housing
according to the embodiment of the present disclosure, preferably,
the first anodic oxidation and/or the second anodic oxidation may
include performing pretreatment on the surface of the aluminum
alloy housing substrate and then forming an anode film by anodic
oxidation. There is no special requirement on the thickness of the
formed anode film, and the thickness is usually 6-10 .mu.m.
[0040] In the preparation method for an aluminum alloy housing
according to the embodiment of the present disclosure, preferably,
the pretreatment is performed to make the surface of the aluminum
alloy housing substrate clean and ensure that a uniform anode film
is formed on the surface of the aluminum alloy housing substrate by
anodic oxidation. The pretreatment may include: performing alkali
etching for 3-20 s at a temperature of 50-70.degree. C. by using
50-60 g/L of sodium hydroxide, neutralizing for 10-20 s a
temperature of 15-25.degree. C. by using 200-300 ml/L of nitric
acid, and performing chemical polishing for 5-20 s at a temperature
of 90-95.degree. C. by using a chemical polishing solution
containing 650-750 ml/L of phosphoric acid and 350-250 ml/L of
sulfuric acid.
[0041] In the preparation method for an aluminum alloy housing
according to the embodiment of the present disclosure, the method
of the anodic oxidation can be an anodic oxidation method commonly
known in the field. Preferably, the anodic oxidation may include
oxidizing the surface of the aluminum alloy housing substrate for
15-50 min under an anode voltage of 13-17 V and at a temperature of
10-21.degree. C. by using 190-200 g/L of sulfuric acid.
[0042] In the preparation method for an aluminum alloy housing
according to the embodiment of the present disclosure, an
electrophoretic decorative layer is formed on surface of the
aluminum alloy housing substrate via the first electrophoretic
treatment and/or the second electrophoretic treatment, which may
protect the aluminum alloy housing effectively and provide a
decorative effect. The first electrophoretic treatment and/or the
second electrophoretic treatment may include electrophoresing for
1-3min under a voltage of 140-200 V and at a temperature of
28-32.degree. C. by using an electrophoresing solution having a pH
of 7-9. The electrophoresing solution could be any electrophoresing
solution commonly used in the art, as long as the electrophoretic
decorative layer could be formed on surface of the aluminum alloy
housing substrate. For example, the electrophoresing solution may
contain a flat lacquer (WNO-1) of Shimizu Corporation (Japan) and a
varnish (NNO-4) of Shimizu Corporation (Japan); the weight ratio of
the flat lacquer to the varnish is 7:3, and a content of a solid
composition in the electrophoresing solution is 13 wt %; the
varnish (NNO-4) includes 50 wt % of acrylic resin, 6 wt % of
2-butoxy ethanol, 20 wt % of ethylene glycol monoisobutyl ether, 18
wt % of diethyl diol butyraldehyde, and 6 wt % of other
composition; the flat lacquer (WNO-1) includes 50 wt % of acrylic
resin, 10 wt % of 2-butoxy ethanol, and 40 wt % of other
composition.
[0043] In the preparation method for an aluminum alloy housing
according to the embodiment of the present disclosure, a texture
pattern having a convex-concave effect on the surface of the
aluminum alloy housing substrate could be obtained by laser carving
a surface of the aluminum alloy housing substrate on which the
mechanical polishing has been performed. A method of the laser
carving could be any method of laser carving commonly used in the
art, for example, the laser carving may carried out through a laser
carving machine, so as to expose the aluminum alloy substrate and
to obtain a texture pattern having a depth of 0.1 m.
[0044] In the preparation method for an aluminum alloy housing
according to the embodiment of the present disclosure, preferably,
the hard anodic oxidation may include oxidizing for 25-50 min under
a temperature of 5-12.degree. C. by using a hard anodic oxidation
solution. More preferably, the hard anodic oxidation solution may
include 170-270 g/L of sulfuric acid and 8-20 g/L of oxalic acid.
Electrical parameters of the hard anodic oxidation may include:
forward square wave pulse, duty ratio of 60%-80%, frequency of
500-1000 Hz, electric current density of 3-7 A/dm.sup.2.
[0045] In the preparation method for an aluminum alloy housing
according to the embodiment of the present disclosure, preferably,
the micro-arc oxidation may include oxidizing for 40-100 min under
a temperature of 20-30.degree. C. by using a micro-arc oxidation
solution. More preferably, the micro-arc oxidation solution may
include 0.02-0.05 mol/L of sodium silicate and 0.03-0.07 mol/L of
sodium hydroxide. A oxidation forward voltage of the micro-arc
oxidation may be 400-600 V.
[0046] The preparation method for an aluminum alloy housing
according to the present disclosure is further described below by
using exemplary embodiments. However, the present disclosure is not
limited to the following exemplary embodiments.
Embodiment 1
[0047] This embodiment is used to describe the aluminum alloy
housing of the present disclosure and a preparation method for
same.
[0048] A pressure-casting aluminum alloy rear housing substrate
(purchased from BYD Co., Ltd.) for use in a P8-model mobile phone
is used as an aluminum alloy housing substrate of the this
embodiment.
[0049] At a temperature of 50.degree. C., the aluminum alloy
housing substrate was subjected to alkali etching for 10 s in a
sodium hydroxide aqueous solution with a concentration of 55 g/L,
and was cleaned twice with deionized water. Then, at a temperature
of 15.degree. C., the aluminum alloy housing substrate was
subjected to neutralization for 10 s in nitric acid with a
concentration of 250 ml/L, and was cleaned twice with deionized
water. Next, at a temperature of 90.degree. C., the aluminum alloy
housing substrate was subjected to polishing for 10 s in a chemical
polishing solution containing 650 ml/L of phosphoric acid and 350
ml/L of sulfuric acid, and was cleaned twice with deionized water.
Then, at a temperature of 15.degree. C., the aluminum alloy housing
substrate was subjected to neutralization for 10 s in nitric acid
with a concentration of 250 ml/L, and was cleaned twice with
deionized water. Next, the aluminum alloy housing substrate was
dried for 20 min at a temperature of 80.degree. C. in a drying
oven, to obtain the cleaned and dried aluminum alloy housing
substrate.
[0050] An anode film was formed on a surface of the cleaned and
dried aluminum alloy housing substrate by anodic oxidation.
Conditions of the anodic oxidation include: using sulfuric acid
with a concentration of 190 g/L as a bath solution, an anode
voltage being 15 V, a temperature being 19.degree. C., and an
oxidation time being 35 min.
[0051] The aluminum alloy housing substrate on which the anodic
oxidation has been performed was subjected to electrophoretic
treatment to form an electrophoretic decorative layer on surface of
the aluminum alloy housing substrate. Conditions of the
electrophoretic treatment include: a temperature of 30.degree. C.,
a voltage of 160 V, a electrophoresing time of 2 min, a pH of 7.8,
using a electrophoresing solution containing a flat lacquer (WNO-1)
of Shimizu Corporation (Japan) and a varnish (NNO-4) of Shimizu
Corporation (Japan); the weight ratio of the flat lacquer to the
varnish is 7:3, and a content of a solid composition in the
electrophoresing solution is 13 wt %; the varnish (NNO-4) includes
50 wt % of acrylic resin, 6 wt % of 2-butoxy ethanol, 20 wt % of
ethylene glycol monoisobutyl ether, 18 wt % of diethyl diol
butyraldehyde, and 6 wt % of other composition; the flat lacquer
(WNO-1) includes 50 wt % of acrylic resin, 10 wt % of 2-butoxy
ethanol, and 40 wt % of other composition.
[0052] The electrophoretic decorative layer on the surface of the
aluminum alloy housing substrate was polished by using a mechanical
polishing machine, to reduce the overall thickness of the
electrophoretic decorative layer by approximately 2 .mu.m, so that
the surface of the electrophoretic decorative layer is glossy and
can reflect light.
[0053] The surface of the aluminum alloy housing substrate on which
the mechanical polishing has been performed was subjected to laser
carving via a laser carving machine, so as to expose the aluminum
alloy substrate and to obtain a texture pattern having a depth of
0.05 mm and a convex-concave effect on the surface of the aluminum
alloy housing substrate.
[0054] Then, at a temperature of 50.degree. C., the aluminum alloy
housing substrate after being laser carved was subjected to alkali
etching for 10 s in a sodium hydroxide aqueous solution with a
concentration of 55 g/L, and was cleaned twice with deionized
water, and then, at a temperature of 15.degree. C., the aluminum
alloy housing substrate was subjected to neutralization for 10 s in
nitric acid with a concentration of 250 ml/L, and was cleaned twice
with deionized water.
[0055] Then, the cleaned aluminum alloy housing substrate was
subjected to electrophoretic treatment to form an electrophoretic
decorative layer on surface of the aluminum alloy housing
substrate, thereby obtaining the aluminum alloy housing of the
present disclosure. Conditions of the electrophoretic treatment
include: a temperature of 30.degree. C., a voltage of 160 V, an
electrophoresing time of 2 min, a pH of 7.8, using an
electrophoresing solution containing a flat lacquer (WNO-1) of
Shimizu Corporation (Japan) and a varnish (NNO-4) of Shimizu
Corporation (Japan). The weight ratio of the flat lacquer to the
varnish is 7:3, and a content of a solid composition in the
electrophoresing solution is 13 wt %; the varnish (NNO-4) includes
50 wt % of acrylic resin, 6 wt % of 2-butoxy ethanol, 20 wt % of
ethylene glycol monoisobutyl ether, 18 wt % of diethyl diol
butyraldehyde, and 6 wt % of other composition; the flat lacquer
(WNO-1) includes 50 wt % of acrylic resin, 10 wt % of 2-butoxy
ethanol, and 40 wt % of other composition.
Embodiment 2
[0056] This embodiment is used to describe the aluminum alloy
housing of the present disclosure and a preparation method for
same.
[0057] A pressure-casting aluminum alloy rear housing substrate
(purchased from BYD Co., Ltd.) for use in a P8-model mobile phone
is used as an aluminum alloy housing substrate of the this
embodiment.
[0058] At a temperature of 70.degree. C., the aluminum alloy
housing substrate was subjected to alkali etching for 20 s in a
sodium hydroxide aqueous solution with a concentration of 60 g/L,
and was cleaned twice with deionized water. Then, at a temperature
of 20.degree. C., the aluminum alloy housing substrate was
subjected to neutralization for 20 s in nitric acid with a
concentration of 300 ml/L, and was cleaned twice with deionized
water. Next, at a temperature of 93.degree. C., the aluminum alloy
housing substrate was subjected to polishing for 20 s in a chemical
polishing solution containing 700 ml/L of phosphoric acid and 300
ml/L of sulfuric acid, and was cleaned twice with deionized water.
Then, at a temperature of 20.degree. C., the aluminum alloy housing
substrate was subjected to neutralization for 20 s in nitric acid
with a concentration of 300 ml/L, and was cleaned twice with
deionized water. Next, the aluminum alloy housing substrate was
dried for 20 min at a temperature of 80.degree. C. in a drying
oven, to obtain the cleaned and dried aluminum alloy housing
substrate.
[0059] An anode film was formed on a surface of the cleaned and
dried aluminum alloy housing substrate by anodic oxidation.
Conditions of the anodic oxidation include: using sulfuric acid
with a concentration of 195 g/L as a bath solution, an anode
voltage being 17 V, a temperature being 10.degree. C., and an
oxidation time being 50 min.
[0060] The aluminum alloy housing substrate on which the anodic
oxidation has been performed was subjected to electrophoretic
treatment to form an electrophoretic decorative layer on surface of
the aluminum alloy housing substrate. Conditions of the
electrophoretic treatment include: a temperature of 32.degree. C.,
a voltage of 200 V, a electrophoresing time of 1 min, a pH of 7,
using a electrophoresing solution containing a flat lacquer (WNO-1)
of Shimizu Corporation (Japan) and a varnish (NNO-4) of Shimizu
Corporation (Japan); the weight ratio of the flat lacquer to the
varnish is 7:3, and a content of a solid composition in the
electrophoresing solution is 13 wt %; the varnish (NNO-4) includes
50 wt % of acrylic resin, 6 wt % of 2-butoxy ethanol, 20 wt % of
ethylene glycol monoisobutyl ether, 18 wt % of diethyl diol
butyraldehyde, and 6 wt % of other composition; the flat lacquer
(WNO-1) includes 50 wt % of acrylic resin, 10 wt % of 2-butoxy
ethanol, and 40 wt % of other composition.
[0061] The electrophoretic decorative layer on the surface of the
aluminum alloy housing substrate was polished by using a mechanical
polishing machine, to reduce the overall thickness of the
electrophoretic decorative layer by approximately 2 .mu.m, so that
the surface of the electrophoretic decorative layer is glossy and
can reflect light.
[0062] The surface of the aluminum alloy housing substrate on which
the mechanical polishing has been performed was subjected to laser
carving via a laser carving machine, so as to expose the aluminum
alloy substrate and to obtain a texture pattern having a depth of
0.2 mm and a convex-concave effect on the surface of the aluminum
alloy housing substrate.
[0063] Then, at a temperature of 7.degree. C., the aluminum alloy
housing substrate after being laser carved was subjected to alkali
etching for 20 s in a sodium hydroxide aqueous solution with a
concentration of 60 g/L, and was cleaned twice with deionized
water, and then, at a temperature of 25.degree. C., the aluminum
alloy housing substrate was subjected to neutralization for 10 s in
nitric acid with a concentration of 300 ml/L, and was cleaned twice
with deionized water.
[0064] Then, the cleaned aluminum alloy housing substrate was
subjected to electrophoretic treatment to form an electrophoretic
decorative layer on surface of the aluminum alloy housing
substrate, thereby obtaining the aluminum alloy housing of the
present disclosure. Conditions of the electrophoretic treatment
include: a temperature of 32.degree. C., a voltage of 200 V, an
electrophoresing time of 1 min, a pH of , using an electrophoresing
solution containing a flat lacquer (WNO-1) of Shimizu Corporation
(Japan) and a varnish (NNO-4) of Shimizu Corporation (Japan). The
weight ratio of the flat lacquer to the varnish is 7:3, and a
content of a solid composition in the electrophoresing solution is
13 wt %; the varnish (NNO-4) includes 50 wt % of acrylic resin, 6
wt % of 2-butoxy ethanol, 20 wt % of ethylene glycol monoisobutyl
ether, 18 wt % of diethyl diol butyraldehyde, and 6 wt % of other
composition; the flat lacquer (WNO-1) includes 50 wt % of acrylic
resin, 10 wt % of 2-butoxy ethanol, and 40 wt % of other
composition.
Embodiment 3
[0065] This embodiment is used to describe the aluminum alloy
housing of the present disclosure and a preparation method for
same.
[0066] A pressure-casting aluminum alloy rear housing substrate
(purchased from BYD Co., Ltd.) for use in a P8-model mobile phone
is used as an aluminum alloy housing substrate of the this
embodiment.
[0067] At a temperature of 50.degree. C., the aluminum alloy
housing substrate was subjected to alkali etching for 10 s in a
sodium hydroxide aqueous solution with a concentration of 55 g/L,
and was cleaned twice with deionized water. Then, at a temperature
of 25.degree. C., the aluminum alloy housing substrate was
subjected to neutralization for 10 s in nitric acid with a
concentration of 250 ml/L, and was cleaned twice with deionized
water. Next, at a temperature of 95.degree. C., the aluminum alloy
housing substrate was subjected to polishing for 10 s in a chemical
polishing solution containing 650 ml/L of phosphoric acid and 350
ml/L of sulfuric acid, and was cleaned twice with deionized water.
Then, at a temperature of 25.degree. C., the aluminum alloy housing
substrate was subjected to neutralization for 10 s in nitric acid
with a concentration of 250 ml/L, and was cleaned twice with
deionized water. Next, the aluminum alloy housing substrate was
dried for 20 min at a temperature of 80.degree. C. in a drying
oven, to obtain the cleaned and dried aluminum alloy housing
substrate.
[0068] An anode film was formed on a surface of the cleaned and
dried aluminum alloy housing substrate by anodic oxidation.
Conditions of the anodic oxidation include: using sulfuric acid
with a concentration of 190 g/L as a bath solution, an anode
voltage being 15 V, a temperature being 19.degree. C., and an
oxidation time being 35 min.
[0069] The aluminum alloy housing substrate on which the anodic
oxidation has been performed was subjected to electrophoretic
treatment to form an electrophoretic decorative layer on surface of
the aluminum alloy housing substrate. Conditions of the
electrophoretic treatment include: a temperature of 30.degree. C.,
a voltage of 160V, a electrophoresing time of 2 min, a pH of 7.8,
using a electrophoresing solution containing a flat lacquer (WNO-1)
of Shimizu Corporation (Japan) and a varnish (NNO-4) of Shimizu
Corporation (Japan); the weight ratio of the flat lacquer to the
varnish is 7:3, and a content of a solid composition in the
electrophoresing solution is 13 wt %; the varnish (NNO-4) includes
50 wt % of acrylic resin, 6 wt % of 2-butoxy ethanol, 20 wt % of
ethylene glycol monoisobutyl ether, 18 wt % of diethyl diol
butyraldehyde, and 6 wt % of other composition; the flat lacquer
(WNO-1) includes 50 wt % of acrylic resin, 10 wt % of 2-butoxy
ethanol, and 40 wt % of other composition.
[0070] The electrophoretic decorative layer on the surface of the
aluminum alloy housing substrate was polished by using a mechanical
polishing machine, to reduce the overall thickness of the
electrophoretic decorative layer by approximately 2 .mu.m, so that
the surface of the electrophoretic decorative layer is glossy and
can reflect light.
[0071] The surface of the aluminum alloy housing substrate on which
the mechanical polishing has been performed was subjected to laser
carving via a laser carving machine, so as to expose the aluminum
alloy substrate and to obtain a texture pattern having a depth of
0.1 mm and a convex-concave effect on the surface of the aluminum
alloy housing substrate.
[0072] Then, at a temperature of 50.degree. C., the aluminum alloy
housing substrate after being laser carved was subjected to alkali
etching for 10 s in a sodium hydroxide aqueous solution with a
concentration of 55 g/L, and was cleaned twice with deionized
water, and then, at a temperature of 25.degree. C., the aluminum
alloy housing substrate was subjected to neutralization for 10 s in
nitric acid with a concentration of 250 ml/L, and was cleaned twice
with deionized water.
[0073] Then, the cleaned aluminum alloy housing substrate was
subjected to anodic oxidation to form an anode film on a surface of
the cleaned aluminum alloy housing substrate, thereby obtaining the
aluminum alloy housing of the present disclosure. Conditions of the
anodic oxidation include: using sulfuric acid with a concentration
of 190 g/L as a bath solution, an anode voltage being 15 V, a
temperature being 19.degree. C., and an oxidation time being 5
min.
Embodiment 4
[0074] This embodiment is used to describe the aluminum alloy
housing of the present disclosure and a preparation method for
same.
[0075] A pressure-casting aluminum alloy rear housing substrate
(purchased from BYD Co., Ltd.) for use in a P8-model mobile phone
is used as an aluminum alloy housing substrate of the this
embodiment.
[0076] At a temperature of 50.degree. C., the aluminum alloy
housing substrate was subjected to alkali etching for 10 s in a
sodium hydroxide aqueous solution with a concentration of 55 g/L,
and was cleaned twice with deionized water. Then, at a temperature
of 25.degree. C., the aluminum alloy housing substrate was
subjected to neutralization for 10 s in nitric acid with a
concentration of 250 ml/L, and was cleaned twice with deionized
water. Next, at a temperature of 95.degree. C., the aluminum alloy
housing substrate was subjected to polishing for 10 s in a chemical
polishing solution containing 650 ml/L of phosphoric acid and 350
ml/L of sulfuric acid, and was cleaned twice with deionized water.
Then, at a temperature of 25.degree. C., the aluminum alloy housing
substrate was subjected to neutralization for 10 s in nitric acid
with a concentration of 250 ml/L, and was cleaned twice with
deionized water. Next, the aluminum alloy housing substrate was
dried for 20 min at a temperature of 80.degree. C. in a drying
oven, to obtain the cleaned and dried aluminum alloy housing
substrate.
[0077] An anode film was formed on a surface of the cleaned and
dried aluminum alloy housing substrate by anodic oxidation.
Conditions of the anodic oxidation include: using sulfuric acid
with a concentration of 190 g/L as a bath solution, an anode
voltage being 15 V, a temperature being 19.degree. C., and an
oxidation time being 35 min.
[0078] The aluminum alloy housing substrate on which the anodic
oxidation has been performed was subjected to electrophoretic
treatment to form an electrophoretic decorative layer on surface of
the aluminum alloy housing substrate. Conditions of the
electrophoretic treatment include: a temperature of 30.degree. C.,
a voltage of 160V, a electrophoresing time of 2 min, a pH of 7.8,
using a electrophoresing solution containing a flat lacquer (WNO-1)
of Shimizu Corporation (Japan) and a varnish (NNO-4) of Shimizu
Corporation (Japan); the weight ratio of the flat lacquer to the
varnish is 7:3, and a content of a solid composition in the
electrophoresing solution is 13 wt %; the varnish (NNO-4) includes
50 wt % of acrylic resin, 6 wt % of 2-butoxy ethanol, 20 wt % of
ethylene glycol monoisobutyl ether, 18 wt % of diethyl diol
butyraldehyde, and 6 wt % of other composition; the flat lacquer
(WNO-1) includes 50 wt % of acrylic resin, 10 wt % of 2-butoxy
ethanol, and 40 wt % of other composition.
[0079] The electrophoretic decorative layer on the surface of the
aluminum alloy housing substrate was polished by using a mechanical
polishing machine, to reduce the overall thickness of the
electrophoretic decorative layer by approximately 2 .mu.m, so that
the surface of the electrophoretic decorative layer is glossy and
can reflect light.
[0080] The surface of the aluminum alloy housing substrate on which
the mechanical polishing has been performed was subjected to laser
carving via a laser carving machine, so as to expose the aluminum
alloy substrate and to obtain a texture pattern having a depth of
0.1 mm and a convex-concave effect on the surface of the aluminum
alloy housing substrate.
[0081] Then, at a temperature of 50.degree. C., the aluminum alloy
housing substrate after being laser carved was subjected to alkali
etching for 10 s in a sodium hydroxide aqueous solution with a
concentration of 55 g/L, and was cleaned twice with deionized
water, and then, at a temperature of 25.degree. C., the aluminum
alloy housing substrate was subjected to neutralization for 10 s in
nitric acid with a concentration of 250 ml/L, and was cleaned twice
with deionized water.
[0082] Then, the cleaned aluminum alloy housing substrate was
subjected to hard anodic oxidation by using a hard anodic oxidation
solution including 200 g/L of sulfuric acid and 15 g/L of oxalic
acid for 25 min, under a temperature of 10.degree. C. An electrical
parameters of the hard anodic oxidation include: forward square
wave pulse, duty ratio of 70%, frequency of 800 Hz, electric
current density of 5 A/dm.sup.2; thereby obtaining the aluminum
alloy housing of the present disclosure.
Embodiment 5
[0083] This embodiment is used to describe the aluminum alloy
housing of the present disclosure and a preparation method for
same.
[0084] A pressure-casting aluminum alloy rear housing substrate
(purchased from BYD Co., Ltd.) for use in a P8-model mobile phone
is used as an aluminum alloy housing substrate of the this
embodiment.
[0085] At a temperature of 50.degree. C., the aluminum alloy
housing substrate was subjected to alkali etching for 10 s in a
sodium hydroxide aqueous solution with a concentration of 55 g/L,
and was cleaned twice with deionized water. Then, at a temperature
of 25.degree. C., the aluminum alloy housing substrate was
subjected to neutralization for 10 s in nitric acid with a
concentration of 250 ml/L, and was cleaned twice with deionized
water. Next, at a temperature of 95.degree. C., the aluminum alloy
housing substrate was subjected to polishing for 10 s in a chemical
polishing solution containing 650 ml/L of phosphoric acid and 350
ml/L of sulfuric acid, and was cleaned twice with deionized water.
Then, at a temperature of 25.degree. C., the aluminum alloy housing
substrate was subjected to neutralization for 10 s in nitric acid
with a concentration of 250 ml/L, and was cleaned twice with
deionized water. Next, the aluminum alloy housing substrate was
dried for 20 min at a temperature of 80.degree. C. in a drying
oven, to obtain the cleaned and dried aluminum alloy housing
substrate.
[0086] An anode film was formed on a surface of the cleaned and
dried aluminum alloy housing substrate by anodic oxidation.
Conditions of the anodic oxidation include: using sulfuric acid
with a concentration of 190 g/L as a bath solution, an anode
voltage being 15 V, a temperature being 19.degree. C., and an
oxidation time being 35 min.
[0087] The aluminum alloy housing substrate on which the anodic
oxidation has been performed was subjected to electrophoretic
treatment to form an electrophoretic decorative layer on surface of
the aluminum alloy housing substrate. Conditions of the
electrophoretic treatment include: a temperature of 30.degree. C.,
a voltage of 160V, a electrophoresing time of 2 min, a pH of 7.8,
using a electrophoresing solution containing a flat lacquer (WNO-1)
of Shimizu Corporation (Japan) and a varnish (NNO-4) of Shimizu
Corporation (Japan); the weight ratio of the flat lacquer to the
varnish is 7:3, and a content of a solid composition in the
electrophoresing solution is 13 wt %; the varnish (NNO-4) includes
50 wt % of acrylic resin, 6 wt % of 2-butoxy ethanol, 20 wt % of
ethylene glycol monoisobutyl ether, 18 wt % of diethyl diol
butyraldehyde, and 6 wt % of other composition; the flat lacquer
(WNO-1) includes 50 wt % of acrylic resin, 10 wt % of 2-butoxy
ethanol, and 40 wt % of other composition.
[0088] The electrophoretic decorative layer on the surface of the
aluminum alloy housing substrate was polished by using a mechanical
polishing machine, to reduce the overall thickness of the
electrophoretic decorative layer by approximately 2 .mu.m, so that
the surface of the electrophoretic decorative layer is glossy and
can reflect light.
[0089] The surface of the aluminum alloy housing substrate on which
the mechanical polishing has been performed was subjected to laser
carving via a laser carving machine, so as to expose the aluminum
alloy substrate and to obtain a texture pattern having a depth of
0.1 mm and a convex-concave effect on the surface of the aluminum
alloy housing substrate.
[0090] Then, at a temperature of 50.degree. C., the aluminum alloy
housing substrate after being laser carved was subjected to alkali
etching for 10 s in a sodium hydroxide aqueous solution with a
concentration of 55 g/L, and was cleaned twice with deionized
water, and then, at a temperature of 25.degree. C., the aluminum
alloy housing substrate was subjected to neutralization for 10 s in
nitric acid with a concentration of 250 ml/L, and was cleaned twice
with deionized water.
[0091] Then, the cleaned aluminum alloy housing substrate was
subjected to hard anodic oxidation by using a hard anodic oxidation
solution including 170 g/L of sulfuric acid and 20 g/L of oxalic
acid for 30 min, under a temperature of 5.degree. C. An electrical
parameters of the hard anodic oxidation include: forward square
wave pulse, duty ratio of 80%, frequency of 500 Hz, electric
current density of 3 A/dm.sup.2; thereby obtaining the aluminum
alloy housing of the present disclosure.
Embodiment 6
[0092] This embodiment is used to describe the aluminum alloy
housing of the present disclosure and a preparation method for
same.
[0093] A pressure-casting aluminum alloy rear housing substrate
(purchased from BYD Co., Ltd.) for use in a P8-model mobile phone
is used as an aluminum alloy housing substrate of the this
embodiment.
[0094] At a temperature of 50.degree. C., the aluminum alloy
housing substrate was subjected to alkali etching for 10 s in a
sodium hydroxide aqueous solution with a concentration of 55 g/L,
and was cleaned twice with deionized water. Then, at a temperature
of 25.degree. C., the aluminum alloy housing substrate was
subjected to neutralization for 10 s in nitric acid with a
concentration of 250 ml/L, and was cleaned twice with deionized
water. Next, at a temperature of 95.degree. C., the aluminum alloy
housing substrate was subjected to polishing for 10 s in a chemical
polishing solution containing 650 ml/L of phosphoric acid and 350
ml/L of sulfuric acid, and was cleaned twice with deionized water.
Then, at a temperature of 25.degree. C., the aluminum alloy housing
substrate was subjected to neutralization for 10 s in nitric acid
with a concentration of 250 ml/L, and was cleaned twice with
deionized water. Next, the aluminum alloy housing substrate was
dried for 20 min at a temperature of 80.degree. C. in a drying
oven, to obtain the cleaned and dried aluminum alloy housing
substrate.
[0095] An anode film was formed on a surface of the cleaned and
dried aluminum alloy housing substrate by anodic oxidation.
Conditions of the anodic oxidation include: using sulfuric acid
with a concentration of 190 g/L as a bath solution, an anode
voltage being 15 V, a temperature being 19.degree. C., and an
oxidation time being 35 min.
[0096] The aluminum alloy housing substrate on which the anodic
oxidation has been performed was subjected to electrophoretic
treatment to form an electrophoretic decorative layer on surface of
the aluminum alloy housing substrate. Conditions of the
electrophoretic treatment include: a temperature of 30.degree. C.,
a voltage of 160V, a electrophoresing time of 2 min, a pH of 7.8,
using a electrophoresing solution containing a flat lacquer (WNO-1)
of Shimizu Corporation (Japan) and a varnish (NNO-4) of Shimizu
Corporation (Japan); the weight ratio of the flat lacquer to the
varnish is 7:3, and a content of a solid composition in the
electrophoresing solution is 13 wt %; the varnish (NNO-4) includes
50 wt % of acrylic resin, 6 wt % of 2-butoxy ethanol, 20 wt % of
ethylene glycol monoisobutyl ether, 18 wt % of diethyl diol
butyraldehyde, and 6 wt % of other composition; the flat lacquer
(WNO-1) includes 50 wt % of acrylic resin, 10 wt % of 2-butoxy
ethanol, and 40 wt % of other composition.
[0097] The electrophoretic decorative layer on the surface of the
aluminum alloy housing substrate was polished by using a mechanical
polishing machine, to reduce the overall thickness of the
electrophoretic decorative layer by approximately 2 .mu.m, so that
the surface of the electrophoretic decorative layer is glossy and
can reflect light.
[0098] The surface of the aluminum alloy housing substrate on which
the mechanical polishing has been performed was subjected to laser
carving via a laser carving machine, so as to expose the aluminum
alloy substrate and to obtain a texture pattern having a depth of
0.1 mm and a convex-concave effect on the surface of the aluminum
alloy housing substrate.
[0099] Then, at a temperature of 50.degree. C., the aluminum alloy
housing substrate after being laser carved was subjected to alkali
etching for 10 s in a sodium hydroxide aqueous solution with a
concentration of 55 g/L, and was cleaned twice with deionized
water, and then, at a temperature of 25.degree. C., the aluminum
alloy housing substrate was subjected to neutralization for 10 s in
nitric acid with a concentration of 250 ml/L, and was cleaned twice
with deionized water.
[0100] Then, the cleaned aluminum alloy housing substrate was
subjected to hard anodic oxidation by using a hard anodic oxidation
solution including 270 g/L of sulfuric acid and 20 g/L of oxalic
acid for 25 min, under a temperature of 12.degree. C. An electrical
parameters of the hard anodic oxidation include: forward square
wave pulse, duty ratio of 60%, frequency of 1000 Hz, electric
current density of 7 A/dm.sup.2; thereby obtaining the aluminum
alloy housing of the present disclosure.
Embodiment 7
[0101] This embodiment is used to describe the aluminum alloy
housing of the present disclosure and a preparation method for
same.
[0102] A pressure-casting aluminum alloy rear housing substrate
(purchased from BYD Co., Ltd.) for use in a P8-model mobile phone
is used as an aluminum alloy housing substrate of the this
embodiment.
[0103] At a temperature of 50.degree. C., the aluminum alloy
housing substrate was subjected to alkali etching for 10 s in a
sodium hydroxide aqueous solution with a concentration of 55 g/L,
and was cleaned twice with deionized water. Then, at a temperature
of 25.degree. C., the aluminum alloy housing substrate was
subjected to neutralization for 10 s in nitric acid with a
concentration of 250 ml/L, and was cleaned twice with deionized
water. Next, at a temperature of 95.degree. C., the aluminum alloy
housing substrate was subjected to polishing for 10 s in a chemical
polishing solution containing 650 ml/L of phosphoric acid and 350
ml/L of sulfuric acid, and was cleaned twice with deionized water.
Then, at a temperature of 25.degree. C., the aluminum alloy housing
substrate was subjected to neutralization for 10 s in nitric acid
with a concentration of 250 ml/L, and was cleaned twice with
deionized water. Next, the aluminum alloy housing substrate was
dried for 20 min at a temperature of 80.degree. C. in a drying
oven, to obtain the cleaned and dried aluminum alloy housing
substrate.
[0104] An anode film was formed on a surface of the cleaned and
dried aluminum alloy housing substrate by anodic oxidation.
Conditions of the anodic oxidation include: using sulfuric acid
with a concentration of 190 g/L as a bath solution, an anode
voltage being 15 V, a temperature being 19.degree. C., and an
oxidation time being 35 min.
[0105] The aluminum alloy housing substrate on which the anodic
oxidation has been performed was subjected to electrophoretic
treatment to form an electrophoretic decorative layer on surface of
the aluminum alloy housing substrate. Conditions of the
electrophoretic treatment include: a temperature of 30.degree. C.,
a voltage of 160V, a electrophoresing time of 2 min, a pH of 7.8,
using a electrophoresing solution containing a flat lacquer (WNO-1)
of Shimizu Corporation (Japan) and a varnish (NNO-4) of Shimizu
Corporation (Japan); the weight ratio of the flat lacquer to the
varnish is 7:3, and a content of a solid composition in the
electrophoresing solution is 13 wt %; the varnish (NNO-4) includes
50 wt % of acrylic resin, 6 wt % of 2-butoxy ethanol, 20 wt % of
ethylene glycol monoisobutyl ether, 18 wt % of diethyl diol
butyraldehyde, and 6 wt % of other composition; the flat lacquer
(WNO-1) includes 50 wt % of acrylic resin, 10 wt % of 2-butoxy
ethanol, and 40 wt % of other composition.
[0106] The electrophoretic decorative layer on the surface of the
aluminum alloy housing substrate was polished by using a mechanical
polishing machine, to reduce the overall thickness of the
electrophoretic decorative layer by approximately 2 .mu.m, so that
the surface of the electrophoretic decorative layer is glossy and
can reflect light.
[0107] The surface of the aluminum alloy housing substrate on which
the mechanical polishing has been performed was subjected to laser
carving via a laser carving machine, so as to expose the aluminum
alloy substrate and to obtain a texture pattern having a depth of
0.1 mm and a convex-concave effect on the surface of the aluminum
alloy housing substrate.
[0108] Then, at a temperature of 50.degree. C., the aluminum alloy
housing substrate after being laser carved was subjected to alkali
etching for 10 s in a sodium hydroxide aqueous solution with a
concentration of 55 g/L, and was cleaned twice with deionized
water, and then, at a temperature of 25.degree. C., the aluminum
alloy housing substrate was subjected to neutralization for 10 s in
nitric acid with a concentration of 250 ml/L, and was cleaned twice
with deionized water.
[0109] Then, the cleaned aluminum alloy housing substrate was
subjected to micro-arc oxidation by using a micro-arc oxidation
solution including 0.03 mol/L of sodium silicate and 0.05 mol/L of
sodium hydroxide for 40 min, under a temperature of 25.degree. C.,
and an oxidation forward voltage of 500 V; thereby obtaining the
aluminum alloy housing of the present disclosure.
Embodiment 8
[0110] This embodiment is used to describe the aluminum alloy
housing of the present disclosure and a preparation method for
same.
[0111] A pressure-casting aluminum alloy rear housing substrate
(purchased from BYD Co., Ltd.) for use in a P8-model mobile phone
is used as an aluminum alloy housing substrate of the this
embodiment.
[0112] At a temperature of 50.degree. C., the aluminum alloy
housing substrate was subjected to alkali etching for 10 s in a
sodium hydroxide aqueous solution with a concentration of 55 g/L,
and was cleaned twice with deionized water. Then, at a temperature
of 25.degree. C., the aluminum alloy housing substrate was
subjected to neutralization for 10 s in nitric acid with a
concentration of 250 ml/L, and was cleaned twice with deionized
water. Next, at a temperature of 95.degree. C., the aluminum alloy
housing substrate was subjected to polishing for 10 s in a chemical
polishing solution containing 650 ml/L of phosphoric acid and 350
ml/L of sulfuric acid, and was cleaned twice with deionized water.
Then, at a temperature of 25.degree. C., the aluminum alloy housing
substrate was subjected to neutralization for 10 s in nitric acid
with a concentration of 250 ml/L, and was cleaned twice with
deionized water. Next, the aluminum alloy housing substrate was
dried for 20 min at a temperature of 80.degree. C. in a drying
oven, to obtain the cleaned and dried aluminum alloy housing
substrate.
[0113] An anode film was formed on a surface of the cleaned and
dried aluminum alloy housing substrate by anodic oxidation.
Conditions of the anodic oxidation include: using sulfuric acid
with a concentration of 190 g/L as a bath solution, an anode
voltage being 15 V, a temperature being 19.degree. C., and an
oxidation time being 35 min.
[0114] The aluminum alloy housing substrate on which the anodic
oxidation has been performed was subjected to electrophoretic
treatment to form an electrophoretic decorative layer on surface of
the aluminum alloy housing substrate. Conditions of the
electrophoretic treatment include: a temperature of 30.degree. C.,
a voltage of 160V, a electrophoresing time of 2 min, a pH of 7.8,
using a electrophoresing solution containing a flat lacquer (WNO-1)
of Shimizu Corporation (Japan) and a varnish (NNO-4) of Shimizu
Corporation (Japan); the weight ratio of the flat lacquer to the
varnish is 7:3, and a content of a solid composition in the
electrophoresing solution is 13 wt %; the varnish (NNO-4) includes
50 wt % of acrylic resin, 6 wt % of 2-butoxy ethanol, 20 wt % of
ethylene glycol monoisobutyl ether, 18 wt % of diethyl diol
butyraldehyde, and 6 wt % of other composition; the flat lacquer
(WNO-1) includes 50 wt % of acrylic resin, 10 wt % of 2-butoxy
ethanol, and 40 wt % of other composition.
[0115] The electrophoretic decorative layer on the surface of the
aluminum alloy housing substrate was polished by using a mechanical
polishing machine, to reduce the overall thickness of the
electrophoretic decorative layer by approximately 2 .mu.m, so that
the surface of the electrophoretic decorative layer is glossy and
can reflect light.
[0116] The surface of the aluminum alloy housing substrate on which
the mechanical polishing has been performed was subjected to laser
carving via a laser carving machine, so as to expose the aluminum
alloy substrate and to obtain a texture pattern having a depth of
0.1 mm and a convex-concave effect on the surface of the aluminum
alloy housing substrate.
[0117] Then, at a temperature of 50.degree. C., the aluminum alloy
housing substrate after being laser carved was subjected to alkali
etching for 10 s in a sodium hydroxide aqueous solution with a
concentration of 55 g/L, and was cleaned twice with deionized
water, and then, at a temperature of 25.degree. C., the aluminum
alloy housing substrate was subjected to neutralization for 10 s in
nitric acid with a concentration of 250 ml/L, and was cleaned twice
with deionized water.
[0118] Then, the cleaned aluminum alloy housing substrate was
subjected to micro-arc oxidation by using a micro-arc oxidation
solution including 0.02 mol/L of sodium silicate and 0.07 mol/L of
sodium hydroxide for 100 min, under a temperature of 30.degree. C.,
and an oxidation forward voltage of 400V; thereby obtaining the
aluminum alloy housing of the present disclosure.
Embodiment 9
[0119] This embodiment is used to describe the aluminum alloy
housing of the present disclosure and a preparation method for
same.
[0120] A pressure-casting aluminum alloy rear housing substrate
(purchased from BYD Co., Ltd.) for use in a P8-model mobile phone
is used as an aluminum alloy housing substrate of the this
embodiment.
[0121] At a temperature of 50.degree. C., the aluminum alloy
housing substrate was subjected to alkali etching for 10 s in a
sodium hydroxide aqueous solution with a concentration of 55 g/L,
and was cleaned twice with deionized water. Then, at a temperature
of 25.degree. C., the aluminum alloy housing substrate was
subjected to neutralization for 10 s in nitric acid with a
concentration of 250 ml/L, and was cleaned twice with deionized
water. Next, at a temperature of 95.degree. C., the aluminum alloy
housing substrate was subjected to polishing for 10 s in a chemical
polishing solution containing 650 ml/L of phosphoric acid and 350
ml/L of sulfuric acid, and was cleaned twice with deionized water.
Then, at a temperature of 25.degree. C., the aluminum alloy housing
substrate was subjected to neutralization for 10 s in nitric acid
with a concentration of 250 ml/L, and was cleaned twice with
deionized water. Next, the aluminum alloy housing substrate was
dried for 20 min at a temperature of 80.degree. C. in a drying
oven, to obtain the cleaned and dried aluminum alloy housing
substrate.
[0122] An anode film was formed on a surface of the cleaned and
dried aluminum alloy housing substrate by anodic oxidation.
Conditions of the anodic oxidation include: using sulfuric acid
with a concentration of 190 g/L as a bath solution, an anode
voltage being 15 V, a temperature being 19.degree. C., and an
oxidation time being 35 min.
[0123] The aluminum alloy housing substrate on which the anodic
oxidation has been performed was subjected to electrophoretic
treatment to form an electrophoretic decorative layer on surface of
the aluminum alloy housing substrate. Conditions of the
electrophoretic treatment include: a temperature of 30.degree. C.,
a voltage of 160V, a electrophoresing time of 2 min, a pH of 7.8,
using a electrophoresing solution containing a flat lacquer (WNO-1)
of Shimizu Corporation (Japan) and a varnish (NNO-4) of Shimizu
Corporation (Japan); the weight ratio of the flat lacquer to the
varnish is 7:3, and a content of a solid composition in the
electrophoresing solution is 13 wt %; the varnish (NNO-4) includes
50 wt % of acrylic resin, 6 wt % of 2-butoxy ethanol, 20 wt % of
ethylene glycol monoisobutyl ether, 18 wt % of diethyl diol
butyraldehyde, and 6 wt % of other composition; the flat lacquer
(WNO-1) includes 50 wt % of acrylic resin, 10 wt % of 2-butoxy
ethanol, and 40 wt % of other composition.
[0124] The electrophoretic decorative layer on the surface of the
aluminum alloy housing substrate was polished by using a mechanical
polishing machine, to reduce the overall thickness of the
electrophoretic decorative layer by approximately 2 .mu.m, so that
the surface of the electrophoretic decorative layer is glossy and
can reflect light.
[0125] The surface of the aluminum alloy housing substrate on which
the mechanical polishing has been performed was subjected to laser
carving via a laser carving machine, so as to expose the aluminum
alloy substrate and to obtain a texture pattern having a depth of
0.1 mm and a convex-concave effect on the surface of the aluminum
alloy housing substrate.
[0126] Then, at a temperature of 50.degree. C., the aluminum alloy
housing substrate after being laser carved was subjected to alkali
etching for 10 s in a sodium hydroxide aqueous solution with a
concentration of 55 g/L, and was cleaned twice with deionized
water, and then, at a temperature of 25.degree. C., the aluminum
alloy housing substrate was subjected to neutralization for 10 s in
nitric acid with a concentration of 250 ml/L, and was cleaned twice
with deionized water.
[0127] Then, the cleaned aluminum alloy housing substrate was
subjected to micro-arc oxidation by using a micro-arc oxidation
solution including 0.05 mol/L of sodium silicate and 0.03 mol/L of
sodium hydroxide for 60 min, under a temperature of 20.degree. C.,
and an oxidation forward voltage of 600 V; thereby obtaining the
aluminum alloy housing of the present disclosure.
Performance Tests
[0128] Performance tests are performed, according to the following
methods, on the aluminum alloy housings with clear convex-concave
patterns obtained in Embodiments 1-9. Test results are as shown in
Table 1.
Glossiness Test
[0129] A gloss meter (German BKY micro gloss meter A-4460) was used
to test the glossiness of the surfaces of the aluminum alloy
housings obtained in Embodiments 1-9. The results are as shown in
Table 1.
Scratch Resistance Test
[0130] A UNI pen having 2H hardness was used to scratch at three
different places of a sample with a force of 800 g applied at an
angle of 45 degrees and a stroke of 10 mm. It is observed whether
an evident scratch appears on the sample. If no, it indicates that
the sample is qualified.
High Temperature Resistance Test
[0131] The sample was put into a precise high temperature test
chamber (HOLINK HRHL45), was heated for 240 hours at a temperature
of 85.degree. C., and stayed for 2 hours at room temperature. It is
observed whether fall-off, deformation, crack, and color change
occurs in the appearance of the sample. If no, it indicates that
the sample is qualified.
Low Temperature Resistance Test
[0132] The sample was put into a constant temperature and humidity
test chamber (Taiwan KS ON, THS-2001), stayed for 240 hours at a
temperature of -40.degree. C., and then stayed for 2 hours at room
temperature. It is observed whether fall-off, deformation, crack,
and color change occurs in the appearance of the sample. If no, it
indicates that the sample is qualified.
Moisture Resistance Test
[0133] The sample was put into a constant temperature and humidity
test chamber (Taiwan KSON, HTS-400) with a humidity of 90% and a
temperature of 60.degree. C., stayed for 96 hours, and then stayed
for 2 hours at room temperature. It is observed whether fall-off,
deformation, crack, and color change occurs in the appearance of
the sample. If no, it indicates that the sample is qualified.
Temperature Shock Test
[0134] The sample was put into a thermal shock test chamber (HOLINK
HTS-400), and first stayed for 1 hour in an environment with a
temperature of -40.degree. C.; then, the temperature was switched
to 85.degree. C. (a switching time was 15 s), and the sample stayed
for 1 hour at the temperature of 85.degree. C. This process is
repeated 12 times (24 hours). It is observed whether fall-off,
deformation, crack, and color change occurs in the appearance of
the sample. If no, it indicates that the sample is qualified. Salt
spray test
[0135] The sample was put into a test chamber (HOLINK H-SST-90 salt
spray tester) with a temperature of 30.degree. C. and a humidity of
85% or higher. A solution with pH=6.8 (content of the solution: 50
g/L of NaCl) was used to spray continuously for 48 hours. Then, the
sample was taken out, washed with normal-temperature water for 5
min, and dried with a drier. The sample stayed for 1 hour at room
temperature. It is observed whether fall-off, deformation, crack,
and color change occurs in the appearance of the sample. If no, it
indicates that the sample is qualified.
TABLE-US-00001 TABLE 1 Performance Test Results of Aluminum Alloy
Housings Obtained in Embodiments 1-9 Glossiness Glossiness Scratch
High Low Temperature of convex of concave resistance temperature
temperature Moisture shock Salt spray portion portion test test
test test test test Embodiment 1 96.2 14.5 Qualified Qualified
Qualified Qualified Qualified Qualified Embodiment 2 96.4 15.2
Qualified Qualified Qualified Qualified Qualified Qualified
Embodiment 3 97.2 19.2 Qualified Qualified Qualified Qualified
Qualified Qualified Embodiment 4 95.6 24.8 Qualified Qualified
Qualified Qualified Qualified Qualified Embodiment 5 105.0 16.2
Qualified Qualified Qualified Qualified Qualified Qualified
Embodiment 6 94.5 5.4 Qualified Qualified Qualified Qualified
Qualified Qualified Embodiment 7 93.5 19.7 Qualified Qualified
Qualified Qualified Qualified Qualified Embodiment 8 90.0 0.5
Qualified Qualified Qualified Qualified Qualified Qualified
Embodiment 9 96.5 5.0 Qualified Qualified Qualified Qualified
Qualified Qualified
[0136] It can be seen from the foregoing table that, the surface of
the aluminum alloy housing of the present disclosure is not abraded
easily, and the surface layer does not fall off easily, thereby
improving the durability of the aluminum alloy housing. Moreover,
with the convex-concave pattern, the aluminum alloy housing
achieves a beautiful appearance effect, and has a clear bumpy solid
texture. Therefore, the aluminum alloy housing provided by the
present disclosure is beautiful and durable. In addition, after
mechanical polishing, the surfaces of the aluminum alloy housings
obtained in Embodiments 1-9 are also glossy.
[0137] In the description of the specification, the description
made with reference to terms such as "one embodiment", "some
embodiments", "example", "specific example", or "some examples"
means that a specific characteristic, structure, material or
feature described with reference to the embodiment or example is
included in at least one embodiment or example of the present
disclosure. In the specification, the illustrative expression of
the foregoing terms is not necessarily intended for the same
embodiment or example. Moreover, the described specific
characteristic, structure, material or feature can be combined
properly in any one or more embodiments or examples. In addition,
without causing conflicts, a person skilled in the art can
integrate and combine different embodiments or examples described
in the specification or characteristics of different embodiments or
examples.
[0138] Although the embodiments of the present disclosure have been
shown and described above, it can be understood that the foregoing
embodiments are merely examples and should not be construed as
limitations on the present disclosure. A person of ordinary skill
can make changes, modifications, replacements and transformations
on the embodiments without departing from the scope of the present
disclosure.
* * * * *