US4270957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for cleaning aluminum articles
Assignee: Ford Motor Co
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Filing: 1978-10-25
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Granted: 1981-06-02
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Expires: 1998-10-25
Abstract
Abstract An aluminum article is cleaned to prepare it for plating by soaking it in an aqueous solution containing sodium metasilicate, sodium pyrophosphate and sodium tetraborate at 140 DEG -180 DEG F. The article is then washed by a power spray of a second solution, constituted the same as the first cleaning solution, at 110 DEG -130 DEG F. The article is subsequently rinsed with water and immersed in an aqueous nitric acid solution.
Inventors
- 👤 William A. Donakowski
- 👤 John R. Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:05
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/34; C25D5/42; C25D5/44; C23; C23G; C23G1/00; C23G1/14; C23G1/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A method of pretreating an aluminum article for plating, comprising: (a) cleaning said aluminum article to be substantially free of oxide, said cleaning consisting of soaking the article in a first cleaning solution at 140°-180° F. for 1-4 minutes, said first cleaning solution containing 8 oz./gal. of water of a powder additive comprising 2.5-3.5% sodium metasilicate, 17.5-18.5% sodium pyrophosphate, and 31.0-32% sodium tetraborate; (b) wash the article in a second solution at 110°-130° F., consituted the same as the first cleaning solution, by use of a power spray for 1-3 minutes at 16 psig; (c) rinse the soaked and sprayed article with water for about 1 minute at room temperature; (d) dip the article by immersion in a third water solution for about 15 seconds consisting of 50% HNO 3 and then water rinse.
Claim 2
Independent Claim
134 words
A method of pretreating an aluminum article for plating, comprising: (a) cleaning said aluminum article to be substantially free of oxide, said cleaning consisting of soaking the article in a first cleaning solution at 140°-180° F. for 1-4 minutes, said first cleaning solution containing 8 oz./gal. of water of a powder additive comprising 2.5-3.5% sodium metasilicate, 17.5-18.5% sodium pyrophosphate, and 31.0-32% sodium tetraborate; (b) wash the article in a second solution at 110°-130° F., consituted the same as the first cleaning solution, by use of a power spray for 1-3 minutes at 16 psig; (c) rinse the soaked and sprayed article with water for about 1 minute at room temperature; (d) dip the article by immersion in a third water solution for about 15 seconds consisting of 50% HNO 3 and then water rinse.
References Cited (Backward Citations)
US2511952A
Cited
US2096309A
Cited
US2709847A
Cited
US2871171A
Cited
US3041259A
Cited
US3775265A
Cited
US3975215A
Cited
US4048121A
Cited
US4126483A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-01 | 1984-12-01 | 1985-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-01 | 1988-12-01 | 1989-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-01 | 1992-12-01 | 1993-06-02 | $7700.00 | Window Closed / Lapsed |