U.S. patent application number 10/723934 was filed with the patent office on 2004-06-10 for corrosion protective lacquer for braking surfaces of brake disks and/or brake drums, corrosion protective coating produced therefrom, and a method for removing the corrosion protective coating.
Invention is credited to Bitzer, Rita, Passoth, Half.
Application Number | 20040107866 10/723934 |
Document ID | / |
Family ID | 7658851 |
Filed Date | 2004-06-10 |
United States Patent
Application |
20040107866 |
Kind Code |
A1 |
Bitzer, Rita ; et
al. |
June 10, 2004 |
Corrosion protective lacquer for braking surfaces of brake disks
and/or brake drums, corrosion protective coating produced
therefrom, and a method for removing the corrosion protective
coating
Abstract
A corrosion protective lacquer is for producing a corrosion
protective coating, and a method is for removing the corrosion
protective coating. For a more favorable removal, while maintaining
simultaneous corrosion protection, the corrosion protective
lacquer, and thus also the corrosion protective coating produced
from it, includes protective substances that react with oxygen. The
corrosion protective coating is abraded by the abrasive effect of
the brake linings during braking, the protective substances of the
corrosion protective coating being rubbed into the braking
surface.
Inventors: |
Bitzer, Rita; (Boeblingen,
DE) ; Passoth, Half; (Starzach, DE) |
Correspondence
Address: |
KENYON & KENYON
ONE BROADWAY
NEW YORK
NY
10004
US
|
Family ID: |
7658851 |
Appl. No.: |
10/723934 |
Filed: |
November 25, 2003 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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10723934 |
Nov 25, 2003 |
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09971504 |
Oct 5, 2001 |
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6678935 |
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Current U.S.
Class: |
106/14.12 |
Current CPC
Class: |
C09D 5/084 20130101;
C09D 5/10 20130101; Y10T 29/49885 20150115; F16D 65/12 20130101;
Y10T 29/49982 20150115; F16D 2250/0046 20130101; Y10T 29/49826
20150115 |
Class at
Publication: |
106/014.12 |
International
Class: |
C04B 009/02 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 6, 2000 |
DE |
100 49 456.0 |
Claims
What is claimed is:
1. A corrosion protective lacquer for producing a corrosion
protective coating for a braking surface of at least one of a brake
disk and a brake drum, comprising: a protective substance
configured to react with oxygen.
2. The corrosion protective lacquer according to claim 1, wherein
the protective substance includes at least one of a non-alkaline
metal, a non-earth alkaline metal, an oxidizable metal combination,
phosphate and phosphorous.
3. The corrosion protective lacquer according to claim 1, wherein
the protective substance includes at least one of zinc, an
oxidizable iron oxide, FeO, at least mostly elemental aluminum and
at least mostly elemental aluminum in powder form.
4. The corrosion protective lacquer according to claim 1, wherein
the protective substance is in a proportion of at least 30% by
volume.
5. The corrosion protective lacquer according to claim 1, wherein
the protective substance is in a proportion of at least 50% by
volume.
6. The corrosion protective lacquer according to claim 1, wherein
the protective substance is in a proportion of at least 70% by
volume.
7. The corrosion protective lacquer according to claim 1, wherein a
starting material of the corrosion protective lacquer includes one
of a normal clear lacquer and a tinted lacquer.
8. The corrosion protective lacquer according to claim 1, wherein a
starting material of the corrosion protective lacquer includes a
low proportion of an organic solvent.
9. The corrosion protective lacquer according to claim 8, wherein
the corrosion protective lacquer includes a water-based
lacquer.
10. The corrosion protective lacquer according to claim 1, wherein
the protective substance has an average grain size that is
substantially equal to at least one of a maximum roughness and an
average score mark size of the braking surface.
11. A corrosion protective coating for a braking surface of at
least one of a brake disk and a brake drum, comprising: a lacquer
including a protective substance that reacts with oxygen.
12. The corrosion protective coating according to claim 11, wherein
the protective substance includes at least one of a non-alkaline
metal, a non-earth alkaline metal, an oxidizable metal compound,
phosphate and phosphorous.
13. The corrosion protective coating according to claim 11, wherein
the protective substance includes at least one of zinc, oxidizable
iron oxide, FeO, at least mostly elemental aluminum and at least
mostly elemental aluminum in powder form.
14. The corrosion protective coating according to claim 11, wherein
the protective substance in the corrosion protective coating has a
proportion of at least 30% by volume.
15. The corrosion protective coating according to claim 11, wherein
the protective substance in the corrosion protective coating has a
proportion of at least 50% by volume.
16. The corrosion protective coating according to claim 11, wherein
the protective substance in the corrosion protective coating has a
proportion of at least 70% by volume.
17. The corrosion protective coating according to claim 11, wherein
the protective substance has an average grain size substantially
equal to at least one of a maximum roughness, an average pore
diameter and an average score mark size of the braking surface.
18. A method for removing a corrosion protective coating from a
braking surface of at least one of a brake disk and a brake drum,
comprising the steps of: adding a protective substance to a
corrosion protective lacquer, the protective substance being
configured to at least one of chemically react with oxygen in
response to contact with oxygen and bind with oxygen in response to
contact with oxygen; applying the corrosion protective lacquer to
the braking surface after the adding step; converting the corrosion
protective lacquer to form the corrosion protective coating; and
abrading the corrosion protective coating by an abrasive effect of
a brake lining during braking, the abrading step including the
substep of rubbing the protective substance into the braking
surface.
19. The method according to claim 18, wherein the converting step
includes the substep of hardening the corrosion protective
lacquer.
20. The method according to claim 18, wherein the rubbing substep
includes the substep of rubbing the protective substance into at
least one of recesses, rough areas, pores and grooves of a friction
surface of the brake disk.
21. The method according to claim 18, wherein the protective
substance includes at least one of a non-alkaline metal, a
non-earth alkaline metal, an oxidizable metal compound, phosphate
and phosphorous.
22. The method according to claim 18, wherein the protective
substance has an average grain size substantially equal to at least
one of a maximum roughness, an average pore diameter and an average
score mark size of the braking surface.
23. The method according to claim 18, further comprising the step
of delivering the brake disk to a customer after the abrading
step.
24. The method according to claim 18, further comprising the step
of equipping a vehicle with the brake disk after the abrading
step.
25. The method according to claim 18, further comprising the step
of mounting the at least one of a brake disk and a brake drum on a
vehicle before the abrading step.
26. The method according to claim 18, further comprising the step
of mounting the at least one of a brake disk and a brake drum on a
vehicle after the abrading step.
Description
FIELD OF THE INVENTION
[0001] The present invention relates to a corrosion protective
lacquer for braking surfaces of brake disks and/or brake drums, a
corrosion protective coating made thereof, and a method for
removing the corrosion protective coating as it is used in the shop
of the applicant.
BACKGROUND INFORMATION
[0002] For protection from corrosion, a brake disk and/or brake
drum is generally lacquered. For this a lacquer is used which can
be removed by braking, that is, removed by the abrasive action of
the brake pad in the area of the braking surface. This solution has
proven particularly favorable in vehicles designated for overseas
transportation and with replacement brake disks or drums.
[0003] Despite the advantages of convention methods, braking
surfaces of brake disks or braking surfaces treated with it still
demonstrate sensitivities during transportation, especially because
of the aggressive salt air during overseas transportation. High
quality assurance costs and partial reworks are connected with
this.
[0004] It is an object of the present invention to provide a
corrosion protective lacquer with which a corrosion protective
coating may be produced which makes possible a corrosion protection
even in overseas transportation, less rework and cost reduction,
and which may be removed as simply as possible.
SUMMARY
[0005] The above and other beneficial objects of the present
invention are achieved by providing a corrosion protective lacquer,
a corrosion protective coating and a method as described herein.
Access of oxygen to the braking surface is prevented by covering at
least the braking surfaces with a corrosion protective lacquer
according to the present invention having a high proportion of
protective substances that react with oxygen.
[0006] In order to achieve the desired effect, a protective
substance proportion of at least 30% by volume, for example, at
least 50% by volume or at least 70% by volume, is practical in the
lacquer or clearcoat that is otherwise, for example, of customary
type.
[0007] These protective substances may include, for example,
non-alkaline and non-earth alkaline metals such as, for example,
zinc, elemental aluminum or their oxidizable compounds, such as,
for example, FeO. Additionally, phosphorus and/or phosphates are
also suitable.
[0008] During removal by braking, the substances are, at least
partially, for example, pressed and/or rubbed into the surface of
the braking surface, where they remain and further effect
protection of the metallic surface from oxidation. This removal by
braking may be performed at any time, for example, however, before
delivery of an automobile to a customer, such as on a roller test
stand. Because one obtains corrosion protective action even after
the removal of the corrosion protective coating by braking, the
removal of the corrosion protective coating may be performed, for
example, before mounting the brake disk, shortly after its
manufacture, so that only a brake disk is mounted that is ready and
protected from corrosion.
[0009] By the introduction of the protective substances into the
surface rough spots, pores and score marks of the braking surface,
the normal surface roughness of the braking surfaces, which results
due to the natural pores of the brake disk material and/or grinding
or turning score marks, is reduced at the same time. The result is
a lesser depth of corrosion, whereby in turn the probability of
brake judder is lessened at the same time.
[0010] In order to achieve a particularly satisfactory result, the
average particle size of the protective substances may be smaller
than the maximum roughness and/or the average pore width and/or the
average score mark size of the braking surface.
[0011] A metal lacquer having a zinc dust proportion of
approximately 80' by volume may be a cost-effective solution.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] FIG. 1 is a cross-sectional view of a brake disk having a
combined brake drum and a corrosion protective lacquer applied
thereto.
[0013] FIG. 2 is a cross-sectional view of the brake disk
illustrated in FIG. 1 having the corrosion protective lacquer
solidified to a corrosion protective coating.
[0014] FIG. 3 is a magnified view of a braking surface after
removal of the corrosion protective coating.
DETAILED DESCRIPTION
[0015] FIG. 1 is a cross-sectional view of a brake disk 1 having a
combined brake drum. The whole surface of brake disk 1 is provided
with a corrosion protective lacquer 4. Since the corrosion
protective lacquer may be identical to a conventional lacquer
except for protective substances 10 (illustrated as individual
dots), it is possible to apply it to the surface of brake disk 1
using a normal spraying and/or dipping method.
[0016] After application, corrosion protective lacquer 4 is dried
or allowed to set or cured into corrosion protective coating 6 (see
FIG. 2). Since during curing of the corrosion protective lacquer
the solvent, for example, water, escapes from coating 6, the
proportion of the protective substances 10 in corrosion protective
coating 6 increases as compared to their proportion in corrosion
protective lacquer 4. As illustrated in FIG. 2, this may be seen in
the greater density of the points and coating 6.
[0017] Due to the high proportion of protective substances 10 of,
for example, more than 70' by volume, even a deep crack may not
endanger braking surface 2 of the brake disk and/or braking surface
3 of the brake drum through corrosion, since the oxygen is
intercepted by protective substances 10, whereby they themselves
react in the form of an oxidation.
[0018] FIG. 3 is a magnified view of braking surface 2, 3 after
removal of corrosion protective layer 6 by braking. It may be seen
that protective substances 10 have been inserted into pores 7 and
score marks 8 or other recesses 9.
[0019] This arrangement reduces the normal roughness of braking
surface 2 and, along with that, the corrosion depth to be expected.
Furthermore, at least initially, the rust attack in a vehicle
standing still for a long time is reduced, since in this case,
corrosion protection by self-oxidation of protective substances 10
remains in effect. That is, the inserted protective substances 10
act as a sacrificial anode.
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