US4251329A
Expired / Lapsed
US
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Process for producing a highly corrosion resistant electroplated steel sheet
Assignee: Nippon Steel Corp
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Filing: 1979-10-12
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Granted: 1981-02-17
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Expires: 1999-10-12
Abstract
Abstract Electroplating in an acidic zinc-nickel alloy plating bath containing vanadium ions as a third component provides a plating having a surprisingly high level of corrosion resistance equal to about 10 times that of pure zinc.
Inventors
- 👤 Hidejiro Asano
- 👤 Joji Oka
- 👤 Katushi Saito
- 👤 Masashi Takasugi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:30
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/565
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
90 words
A process for producing a highly corrosion resistant electroplated steel sheet characterized by performing electroplating in an acidic plating bath with a steel sheet used as the cathode, said bath comprising an aqueous solution containing zinc, nickel and one or more third components selected from the group consisting of vanadium (II), vanadium (III), vanadium (IV) and vanadium (V) compounds (the FIGS. II, III, IV and V indicating the valence of vanadium), the content of vanadium being between 0.001 and 0.5 mols per mol of the sum of zinc and nickel.
Claim 2
Dependent Claim
90 words
A process for producing a highly corrosion resistant electroplated steel sheet characterized by performing electroplating in an acidic plating bath with a steel sheet used as the cathode, said bath comprising an aqueous solution containing zinc, nickel and one or more third components selected from the group consisting of vanadium (II), vanadium (III), vanadium (IV) and vanadium (V) compounds (the FIGS. II, III, IV and V indicating the valence of vanadium), the content of vanadium being between 0.001 and 0.5 mols per mol of the sum of zinc and nickel.
Claim 3
Dependent Claim
25 words
A process according to claim 1 wherein the proportion of nickel and zinc is between 0.1 and 3.0 mols of nickel per mol of zinc.
Claim 4
Dependent Claim
89 words
A process according to claim 1 wherein the vanadium compound incorporated as the third component comprises a vanadium (II) compound selected from the group consisting of vanadium (II) sulfate (VSO 4 ), vanadium (II) chloride (VCl 2 ), vanadium acetate and vanadium sulfamate; a vanadium (III) compound selected from the group consisting of vanadium (III) sulfate, vanadium trichloride and vanadium (III) phosphate; a vanadium (IV) compound selected from the group consisting of vanadium oxydichloride (vanadyl chloride), vanadium (IV) oxysulfate (vanadyl sulfate) and vanadium tetrachloride; or a vanadium (V) compound.
Claim 5
Dependent Claim
26 words
A process according to claim 1 wherein the plating bath contains a pH buffer selected from the group consisting of a phosphate, borate and a phthalate.
Claim 6
Dependent Claim
18 words
A process according to claim 1 wherein the pH of the plating bath is between 2 and 4.
Claim 7
Dependent Claim
25 words
A process according to claim 1 wherein the proportion of nickel and zinc is between 0.5 and 2.5 mols of nickel per mol of zinc.
Claim 8
Dependent Claim
26 words
A process according to claim 6 wherein the content of vanadium is between 0.01 and 0.5 mols per mol of the sum of zinc and nickel.
Claim 9
Dependent Claim
18 words
A process according to claim 7 wherein the pH of the plating bath is between 2 and 4.
Claim 10
Dependent Claim
45 words
A process according to claim 1 wherein the proportion of nickel and zinc is between 0.1 and 3.0 mols of nickel per mol of zinc and the content of vanadium is between 0.001 and 0.5 mols per mol of the sum of zinc and nickel.
Claim 11
Dependent Claim
18 words
A process according to claim 9 wherein the pH of the plating bath is between 2 and 4.
Claim 12
Dependent Claim
31 words
A process according to claim 1 wherein the content of vanadium added as the third component is between 0.01 and 0.5 mols per mol of the sum of zinc and nickel.
Claim 13
Dependent Claim
34 words
A process according to claim 1 wherein the vanadium compound comprises a vanadium oxide selected from the group consisting of VO, V 2 O 3 , VO 2 and V 2 O 5 .
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) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |