US4007102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrocoating aluminum sheet or strip
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1974-12-12
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Granted: 1977-02-08
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Expires: 1994-12-12
Abstract
Abstract This invention generally relates to the electrocoating of metal products and in particular is directed to the treatment of continuous aluminum sheet or strip to form a chromium phosphate type conversion coating thereon, subsequently electrocoating the sheet or strip, applying a top coat and then curing both the electrocoated film and the top coat. The electrocoated sheet or strip exhibits superior coating adhesion.
Inventors
- 👤 Willard J. Springer
- 👤 Bruce A. Baker, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:55
CPC Classifications
C; C25; C25D; C25D13/00; C25D13/12; C25D13/16; C25D13/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
146 words
In the method of coating continuous lengths of aluminum sheet or strip which can be subjected to severe deformation in subsequent fabrication steps wherein said sheet or strip is cleaned, treated to form thereon a chemical conversion coating, coated with a primer coat and then coated with a top coat, the improvement comprising forming said chemical conversion coating by treating said sheet or strip for not more than 30 seconds with an acidic aqueous solution containing hexavalent chromium, phosphate and fluoride so as to form thereon from about 10-100 Mg/ft 2 (108-1080 Mg/m 2 ) of a chromium phosphate conversion coating, applying the primer coat by electrocoating a water-based polyelectrolyte resin onto the sheet or strip, applying the top coat in a suitable fashion onto the electrocoated resin and then curing both the electrocoated resin primer coat and the top coat in a single curing step.
Claim 2
Dependent Claim
146 words
In the method of coating continuous lengths of aluminum sheet or strip which can be subjected to severe deformation in subsequent fabrication steps wherein said sheet or strip is cleaned, treated to form thereon a chemical conversion coating, coated with a primer coat and then coated with a top coat, the improvement comprising forming said chemical conversion coating by treating said sheet or strip for not more than 30 seconds with an acidic aqueous solution containing hexavalent chromium, phosphate and fluoride so as to form thereon from about 10-100 Mg/ft 2 (108-1080 Mg/m 2 ) of a chromium phosphate conversion coating, applying the primer coat by electrocoating a water-based polyelectrolyte resin onto the sheet or strip, applying the top coat in a suitable fashion onto the electrocoated resin and then curing both the electrocoated resin primer coat and the top coat in a single curing step.
Claim 3
Dependent Claim
36 words
The method of claim 1 wherein the said acidic aqueous solution contains 4-30 gms/liter chromium expressed as CrO 3 , 2-70 gms/liter phosphate expressed as H 3 PO 4 and 1-10 gms/liter fluoride expressed as NaF.
Claim 4
Dependent Claim
20 words
The method of claim 1 wherein the sheet or strip is treated with said acidic solution for about 0.5-30 seconds.
Claim 5
Dependent Claim
21 words
The method of claim 3 wherein the temperature of said acidic solution ranges from about 70° to 150° F (29.5-65.5° C).
Claim 6
Dependent Claim
19 words
The method of claim 1 wherein said conversion coating weight ranges from 10-60 mg/ft 2 (108-645 mg/m 2 ).
References Cited (Backward Citations)
US3454483A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-08 | 1980-08-09 | 1981-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-08 | 1984-08-09 | 1985-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-08 | 1988-08-09 | 1989-02-08 | $7700.00 | Window Closed / Lapsed |