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US4249999A
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Electrolytic zinc-nickel alloy plating
Assignee: Nippon Steel Corp
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Filing: 1980-03-13
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Granted: 1981-02-10
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Expires: 2000-03-13
Abstract
Abstract A steel strip is electrolytically plated with a Zn-Ni alloy in an electrolyte both containing Zn 2+ and Ni 2+ ions together with a strontium compound in an amount of 0.05-10 g/l, calculated as SrSO 4 is disclosed.
Inventors
- 👤 Tetsuaki Tsuda
- 👤 Tatsuo Kurimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:58
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/565
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
75 words
A method of electrolytically plating a steel strip with a Zn-Ni alloy in an electrolyte bath containing Zn 2+ ions in an amount of 10-130 g/l, Ni 2+ ions in an amount of 20-140 g/l at a current density of 4.0-70 A/dm 2 , at a temperature of 40°-70° C. at a pH of 1.0-4.5, characterized by adding a strontium compound in an amount of 0.05-10 g/l, calculated as SrSO 4 , to the electrolyte.
Claim 2
Independent Claim
75 words
A method of electrolytically plating a steel strip with a Zn-Ni alloy in an electrolyte bath containing Zn 2+ ions in an amount of 10-130 g/l, Ni 2+ ions in an amount of 20-140 g/l at a current density of 4.0-70 A/dm 2 , at a temperature of 40°-70° C. at a pH of 1.0-4.5, characterized by adding a strontium compound in an amount of 0.05-10 g/l, calculated as SrSO 4 , to the electrolyte.
Claim 3
Dependent Claim
21 words
A method as defined in claim 1, in which the strontium compound is added in the form of SrSO 4 .
References Cited (Backward Citations)
US3420754A
Cited
US3558442A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |