Patent US4063968A successfully refreshed from Google Patents.
US4063968A
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Formation of nickel phosphate coatings on iron or steel
Assignee: Henkel Corp
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Filing: 1975-09-29
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Granted: 1977-12-20
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Expires: 1995-09-29
Abstract
Abstract Disclosed is a composition and process useful in forming a nickel phosphate coating on an iron or steel surface.
Inventors
- 👤 Yasunobu Matsushima
- 👤 Shigeo Tanaka
- 👤 Akira Niizuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:22
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/78; C23C22/05; C23C22/06; C23C22/07; C23C22/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
125 words
A process for forming a protective crystalline nickel phosphate coating on an iron or steel surface comprising first contacting the surface with an alkaline alkali metal phosphate solution exhibiting a pH of from 8 to 12 containing 0.5-20 g/l of nickel phosphate suspended therein and thereafter contacting the surface with an aqueous composition consisting essentially of: 1 - 10 g/l of hydroxy carboxylic acid selected from the group consisting of salicylic, gallic, lactic, tartaric, citric, malic, glyceric, glycolic, mandelic and tropic acids 3-50 g/l of phosphate (as P 2 O 5 ) 2-6 g/l of nickel and having a Total Acid value of 10-50 points and a Free Acid value of 1-5 points, whereby a crystalline coating of nickel phosphate is formed on the surface.
Claim 2
Dependent Claim
125 words
A process for forming a protective crystalline nickel phosphate coating on an iron or steel surface comprising first contacting the surface with an alkaline alkali metal phosphate solution exhibiting a pH of from 8 to 12 containing 0.5-20 g/l of nickel phosphate suspended therein and thereafter contacting the surface with an aqueous composition consisting essentially of: 1 - 10 g/l of hydroxy carboxylic acid selected from the group consisting of salicylic, gallic, lactic, tartaric, citric, malic, glyceric, glycolic, mandelic and tropic acids 3-50 g/l of phosphate (as P 2 O 5 ) 2-6 g/l of nickel and having a Total Acid value of 10-50 points and a Free Acid value of 1-5 points, whereby a crystalline coating of nickel phosphate is formed on the surface.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein a ceramic coating is subsequently applied to the treated surface.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein paint is subsequently applied to the treated surface.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-19 | 1981-06-20 | 1981-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-19 | 1985-06-20 | 1985-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-19 | 1989-06-20 | 1989-12-20 | $7700.00 | Window Closed / Lapsed |