US4199624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of substrate prior to autodeposition
Assignee: Henkel Corp
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Filing: 1978-06-21
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Granted: 1980-04-22
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Expires: 1998-06-21
Abstract
Abstract A metallic substrate is cleaned and then pretreated with an aqueous acidic solution for the purpose of reducing or preventing the formation of pinholes in a subsequently applied coating formed by an acidic aqueous coating composition containing dispersed particles of an organic coating-forming material and of the type which forms on a metallic surface immersed therein an organic coating which increases in thickness the longer the surface is immersed in the coating composition.
Inventors
- 👤 Timothy J. C. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:05
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; B05D7/142
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
120 words
In a coating process wherein an autodeposited coating is formed on a metal surface by contacting said surface with an autodepositing coating composition comprising an acidic aqueous solution containing dissolved fluoride and ferric iron and having resin solids dispersed therein and wherein the nature of said metal surface is at least partly roughened or worked such that the cured autodeposited coatings formed on such metal surface from said composition contain defects, the improvement comprising pre-treating such metal surface which is substantially free of soils of the type that are removed by acid cleaning with a non-coating forming aqueous acid solution prior to contacting said surface with said autodepositing composition to prevent the formation of pinholes in the cured autodeposited coating.
Claim 2
Dependent Claim
120 words
In a coating process wherein an autodeposited coating is formed on a metal surface by contacting said surface with an autodepositing coating composition comprising an acidic aqueous solution containing dissolved fluoride and ferric iron and having resin solids dispersed therein and wherein the nature of said metal surface is at least partly roughened or worked such that the cured autodeposited coatings formed on such metal surface from said composition contain defects, the improvement comprising pre-treating such metal surface which is substantially free of soils of the type that are removed by acid cleaning with a non-coating forming aqueous acid solution prior to contacting said surface with said autodepositing composition to prevent the formation of pinholes in the cured autodeposited coating.
Claim 3
Dependent Claim
78 words
A process for coating metal surfaces with an autodepositing coating composition comprising: (A) treating a worked or roughened metal surface which is free of acid removable solid with an alkaline cleaning solution; and thereafter (B) treating said cleaned metal surface with a non-coating forming aqueous acid solution; and thereafter (C) treating said acid treated metal surface with an autodepositing coating composition comprising an acidic aqueous solution containing dissolved fluoride and ferric iron and having resin solids dispersed therein.
Claim 4
Dependent Claim
78 words
A process for coating metal surfaces with an autodepositing coating composition comprising: (A) treating a worked or roughened metal surface which is free of acid removable solid with an alkaline cleaning solution; and thereafter (B) treating said cleaned metal surface with a non-coating forming aqueous acid solution; and thereafter (C) treating said acid treated metal surface with an autodepositing coating composition comprising an acidic aqueous solution containing dissolved fluoride and ferric iron and having resin solids dispersed therein.
Claim 5
Dependent Claim
56 words
A process according to claim 2 wherein said aqueous acid solution contains about 1 to about 5% by volume of phosphoric acid and said metal surface is contacted with said acid solution at a temperature of about 125° F. to about 160° F. for a period of time of about 1 minute to about 2 minutes.
Claim 6
Dependent Claim
81 words
A process for coating metal surfaces with an autodepositing coating composition comprising: (A) treating a worked or roughened metal surface which is substantially free of rust, scale, corrosion products and other acid removable soils with a non-coating forming aqueous acid solution; and thereafter (B) treating said cleaned metal surface with an autodepositing coating composition comprising an acidic aqueous solution containing dissolved fluoride and ferric iron and having resin solids dispersed therein to form a continuous organic coating on said metal surface.
Claim 7
Dependent Claim
81 words
A process for coating metal surfaces with an autodepositing coating composition comprising: (A) treating a worked or roughened metal surface which is substantially free of rust, scale, corrosion products and other acid removable soils with a non-coating forming aqueous acid solution; and thereafter (B) treating said cleaned metal surface with an autodepositing coating composition comprising an acidic aqueous solution containing dissolved fluoride and ferric iron and having resin solids dispersed therein to form a continuous organic coating on said metal surface.
Claim 8
Dependent Claim
41 words
A process according to claim 4 wherein said aqueous acid solution contains between about 1% and about 10% by volume of an acid selected from the group consisting of phosphoric acid, sulfuric acid, hydrochloric acid and hydrofluoric acid and mixtures thereof.
Claim 9
Dependent Claim
55 words
A process according to claim 4 wherein said aqueous acid solution contains about 1 to about 5% volume of phosphoric acid and said metal surface is contacted with said acid solution at a temperature of about 125° F. to about 160° F. for a period of time of about 1 minute to about 2 minutes.
Claim 10
Dependent Claim
28 words
A process according to claim 6 wherein said worked or roughened metal surface is cleaned with an alkaline cleaning solution prior to treating with said aqueous acid solution.
Claim 11
Dependent Claim
30 words
A process according to claim 7 wherein the coated metal surface is treated with an aqueous chrome rinse solution following the formation of the autodeposited coating on the metal surface.
Claim 12
Dependent Claim
22 words
A process according to claim 8 wherein said aqueous acid solution contains between about 0.1% and about 1% by weight of surfactant.
Claim 13
Dependent Claim
31 words
A process according to claim 4 wherein said aqueous acid solution comprises a solution of sodium dihydrogen phosphate in an amount of about 25 grams per liter of aqueous acid solution.
References Cited (Backward Citations)
US1109670A
Cited
US1279101A
Cited
GB517916A
Cited
US2304299A
Cited
GB571976A
Cited
US3585084A
Cited
US3795546A
Cited
US3973998A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-04-22 | 1983-10-22 | 1984-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-22 | 1987-10-22 | 1988-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-22 | 1991-10-22 | 1992-04-22 | $7700.00 | Window Closed / Lapsed |