US4508600A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing Zn-Ni-alloy-electroplated steel sheets with excellent adherence of the plated layer
Assignee: Nippon Steel Nisshin Co Ltd
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Filing: 1984-04-18
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Granted: 1985-04-02
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Expires: 2004-04-18
Abstract
Abstract The adhesion of a corrosion resisting Zn-Ni-alloy plated layer on a steel sheet is improved by pre-plating the steel substrate with a Zn-Ni layer containing Ni in an amount higher than said Zn-Ni-alloy plated layer.
Inventors
- 👤 Taisuke Irie
- 👤 Yoshitaka Nakagawa
- 👤 Masayoshi Tatano
- 👤 Koichi Watanabe
- 👤 Eiji Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:30
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/562; C25D3/565; C25D5/00; C25D5/10; C25D5/12; C25D5/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
111 words
A process for preparing Zn-Ni-alloy plated steel sheets with excellent adhesion of the plated layer comprising pre-plating a steel sheet in an acidic plating bath containing 7-38 g/l Zn and 41-88 g/l Ni whereby the concentration ratio [Ni 2+ ]/([Zn 2+ ]+[Ni 2+ ]) is 0.70-0.85 with an electric current density of 2-20 A/dm 2 at a temperature between 55° and 80 ° C. so that the resulting Zn-Ni pre-plated layer contains 12-87 wt % Ni; and electroplating said pre-plated steel sheet in an acidic electroplating bath containing 25-33 g/l Zn, 41-88 g/l Ni, 0.2-10 g/l titanium and 0.1-5 g/l aluminum or 0.2-4 g/l magnesium, the pH of which is 1.5-2.5.
Claim 2
Dependent Claim
111 words
A process for preparing Zn-Ni-alloy plated steel sheets with excellent adhesion of the plated layer comprising pre-plating a steel sheet in an acidic plating bath containing 7-38 g/l Zn and 41-88 g/l Ni whereby the concentration ratio [Ni 2+ ]/([Zn 2+ ]+[Ni 2+ ]) is 0.70-0.85 with an electric current density of 2-20 A/dm 2 at a temperature between 55° and 80 ° C. so that the resulting Zn-Ni pre-plated layer contains 12-87 wt % Ni; and electroplating said pre-plated steel sheet in an acidic electroplating bath containing 25-33 g/l Zn, 41-88 g/l Ni, 0.2-10 g/l titanium and 0.1-5 g/l aluminum or 0.2-4 g/l magnesium, the pH of which is 1.5-2.5.
Claim 3
Dependent Claim
26 words
The process as described in claim 1, wherein the Zn content of the pre-plating bath is 11-34 g/l and the Ni content thereof is 62-79 g/l.
Claim 4
Dependent Claim
26 words
The process as described in claim 1, wherein the Zn content of the pre-plating bath is 15-30 g/l and the Ni content thereof is 85-70 g/l.
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) | 1988-04-01 | 1988-10-01 | 1989-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-01 | 1992-10-01 | 1993-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-01 | 1996-10-01 | 1997-04-02 | $7700.00 | Window Closed / Lapsed |