US4612236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating for increasing corrosion resistance and reducing hydrogen reembrittlement of metal articles
Assignee: Boeing Co
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Filing: 1985-05-20
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Granted: 1986-09-16
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Expires: 2005-05-20
Abstract
Abstract Plated high strength steel articles having a metallic plated coating exhibit high corrosion resistance and low hydrogen reembrittlement characteristics when an acrylic polymeric coating, such as a methyl methacrylate polymer is applied to the aritcle. A corrosion inhibitor and adhesion promoter such as benzotriazole and a leveling agent such as an alkyd polymer can be incorporated with the acrylic polymer in minor proportions to further enhance the corrosion resistance characteristics of the coating. A benzotriazole-containing acrylic polymer formulation also enhances the corrosion resistance characteristics of an unplated metal substrate.
Inventors
- 👤 Grace F. Hsu
- 👤 Richard C. Colonel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:28
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; B05D7/16; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12104; Y10T428/12111; Y10T428/12118; Y10T428/12125; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
99 words
A plated metallic article exhibiting high corrosion resistance and low hydrogen embrittlement and reembrittlement characteristics comprising: a metal substrate, a metallic plated coating providing high corrosion resistance and low hydrogen embrittlement adhered to said substrate, said coating comprising a metal or metal alloy, or combination of metal alloys, and a polymeric coating providing high corrosion resistance and low hydrogen reembrittlement adherently overlying said plated coating comprising a metal or metal alloy, or combination of metal alloys, and a polymeric coating providing high corrosion resistance and low hydrogen reembrittlement adherently overlying said plated coating comprising a water insoluble acrylic polymer.
Claim 2
Dependent Claim
99 words
A plated metallic article exhibiting high corrosion resistance and low hydrogen embrittlement and reembrittlement characteristics comprising: a metal substrate, a metallic plated coating providing high corrosion resistance and low hydrogen embrittlement adhered to said substrate, said coating comprising a metal or metal alloy, or combination of metal alloys, and a polymeric coating providing high corrosion resistance and low hydrogen reembrittlement adherently overlying said plated coating comprising a metal or metal alloy, or combination of metal alloys, and a polymeric coating providing high corrosion resistance and low hydrogen reembrittlement adherently overlying said plated coating comprising a water insoluble acrylic polymer.
Claim 3
Dependent Claim
13 words
The article of claim 1 wherein said polymer comprises a methyl methacrylate polymer.
Claim 4
Dependent Claim
17 words
The article of claim 1 wherein said polymeric coating further comprises a corrosion inhibitor and adhesion promoter.
Claim 5
Dependent Claim
14 words
The article of claim 3 wherein said corrosion inhibitor and adhesion promoter comprises benzotriazole.
Claim 6
Dependent Claim
14 words
The article of claim 1 wherein said polymeric coating further comprises a leveling agent.
Claim 7
Dependent Claim
21 words
The article of claim 5 wherein said leveling agent comprises an alkyd polymer present in minor proportions in said polymeric coating.
Claim 8
Dependent Claim
12 words
The article of claim 6 wherein said polymeric coating further comprises benzotriazole.
Claim 9
Dependent Claim
13 words
The article of claim 1 wherein said metal alloy comprises a zinc-nickel alloy.
Claim 10
Dependent Claim
25 words
The article according to claim 1 wherein said polymeric coating is applied to form a coat ranging in thickness from approximately 0.02 to 1 mil.
Claim 11
Dependent Claim
25 words
The article according to claim 9 wherein said polymeric coating is applied to form a coat ranging in thickness from approximately 0.02 to 0.05 mil.
Claim 12
Dependent Claim
22 words
The article according to claim 8 wherein said metal alloy consists of approximately 80-94% by weight zinc and the balance is nickel.
Claim 13
Independent Claim
50 words
The method for producing a corrosion resistant and low hydrogen embrittlement and reembrittlement resistant coating on a metal article comprising the step of coating a metal substrate to be protected from corrosion or hydrogen embrittlement with a coating solution comprising a water insoluble acrylic polymer, benzotriazole, and a solvent therefore.
Claim 14
Independent Claim
50 words
The method for producing a corrosion resistant and low hydrogen embrittlement and reembrittlement resistant coating on a metal article comprising the step of coating a metal substrate to be protected from corrosion or hydrogen embrittlement with a coating solution comprising a water insoluble acrylic polymer, benzotriazole, and a solvent therefore.
Claim 15
Dependent Claim
53 words
The method of claim 12 wherein said resin is present in solution in an amount ranging from 5 to 40 percent by weight based on the total solution, wherein said benzotriazole is present in an amount up to 2 percent by weight, and wherein the balance of said solution is a solvent therefor.
Claim 16
Dependent Claim
16 words
The method of claim 13 wherein said solvent comprises toluene, methycellosolve, lower alcohols and mixtures thereof.
Claim 17
Dependent Claim
9 words
The article produced by the method of claim 12.
Claim 18
Dependent Claim
25 words
The method according to claim 12 wherein said coating solution is applied to form a coat ranging in thickness from approximately 0.02 to 1 mil.
Claim 19
Dependent Claim
25 words
The method according to claim 16 wherein said coating solution is applied to form a coat ranging in thickness from approximately 0.02 to 0.05 mil.
Claim 20
Dependent Claim
85 words
The article produced by a method for producing a steel article having excellent corrosion resistance and exhibiting low hydrogen embrittlement and low hydrogen reembrittlement characteristics comprising the steps of: electroplating a corrosion resistant metallic coating on said article, baking said plated article to drive entrapped hydrogen from said article, and thereafter applying to said plated article a coating material comprising an acrylic polymer selected from the group consisting of acrylic acid, acrylic acid esters, methacrylic acid, methacrylic and esters and acrylonitrile and a solvent therefor.
Claim 21
Dependent Claim
85 words
The article produced by a method for producing a steel article having excellent corrosion resistance and exhibiting low hydrogen embrittlement and low hydrogen reembrittlement characteristics comprising the steps of: electroplating a corrosion resistant metallic coating on said article, baking said plated article to drive entrapped hydrogen from said article, and thereafter applying to said plated article a coating material comprising an acrylic polymer selected from the group consisting of acrylic acid, acrylic acid esters, methacrylic acid, methacrylic and esters and acrylonitrile and a solvent therefor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-15 | 1990-03-17 | 1990-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-15 | 1994-03-17 | 1994-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-15 | 1998-03-17 | 1998-09-16 | $7700.00 | Window Closed / Lapsed |