US4313802A
Expired / Lapsed
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Method of plating steel strip with nickel-zinc alloy
Assignee: Nippon Steel Corp
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Filing: 1980-02-05
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Granted: 1982-02-02
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Expires: 2000-02-05
Abstract
Abstract A method of plating steel strip with a zinc-nickel alloy in an acidic bath, comprises continuously passing the steel strip through the electrolytic plating bath under the conditions that the concentration of Ni 2+ is kept at a level of 20 g/l or more and the concentration of Zn 2+ at a level of 10 g/l or more and the molar ratio of Ni 2+ /Zn 2+ is restricted to a range of from 1.5 to 4.0 with the speed of passage of the steel strip through the electrolyte relative to the counter-current flow of the electrolyte kept at 10-200 m/min.
Inventors
- 👤 Atsuyoshi Shibuya
- 👤 Tatsuo Kurimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:24
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/565
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
131 words
A method of plating steel strip at a current density higher than 5 A/dm 2 with a zinc-nickel alloy which comprises continuously passing the steel strip at a predetermined feeding rate through an electrolyte plating bath at a pH of 1.0-4.5 and a temperature of 40°-70° C. in which the concentration of Ni 2+ is maintained at a level of 20 g/l or more and the concentration of Zn 2+ at a level of 10 g/l or more and simultaneously the molar ratio of Ni 2+ /Zn 2+ is restricted to a range from 1.5 to 4.0, with the relative speed of passage of the steel strip with respect to the electrolyte being maintained at 10-200 m/min. by flowing the electrolyte counter-current to the direction of travel of the steel strip.
Claim 2
Independent Claim
131 words
A method of plating steel strip at a current density higher than 5 A/dm 2 with a zinc-nickel alloy which comprises continuously passing the steel strip at a predetermined feeding rate through an electrolyte plating bath at a pH of 1.0-4.5 and a temperature of 40°-70° C. in which the concentration of Ni 2+ is maintained at a level of 20 g/l or more and the concentration of Zn 2+ at a level of 10 g/l or more and simultaneously the molar ratio of Ni 2+ /Zn 2+ is restricted to a range from 1.5 to 4.0, with the relative speed of passage of the steel strip with respect to the electrolyte being maintained at 10-200 m/min. by flowing the electrolyte counter-current to the direction of travel of the steel strip.
Claim 3
Dependent Claim
16 words
The method defined in claim 1, in which the current density is 5-40 A/dm 2 .
Claim 4
Dependent Claim
26 words
The method defined in claim 1, in which the relative speed of the steel strip passing through the electrolytic plating bath is up to 100 m/min.
Claim 5
Dependent Claim
18 words
The method defined in claim 1, in which the zinc-nickel alloy contains nickel in the range of 9-20%.
Claim 6
Dependent Claim
25 words
The method defined in claim 1, in which the molar ratio of Ni 2+ /Zn 2+ is restricted to a range of 1.8 to 3.0.
Claim 7
Independent Claim
151 words
A method of plating steel strip at a current density higher than 5 A/dm 2 with a zinc-nickel alloy which comprises continuously passing the steel strip at a predetermined feeding rate through an electrolytic plating bath at a pH of 1.0-4.5 and a temperature of 40°-70° C. provided with at least one soluble anode made of nickel and with at least one soluble anode made of zinc, the concentration of Ni 2+ ions in the electrolyte being maintained at a level of 20 g/l or more and the concentration of Zn 2+ ions at a level of 10 g/l or more and simultaneously the molar ratio of Ni 2+ /Zn 2+ being restricted to a range of from 1.5-4.0, with the speed of passage of the steel strip relative to the electrolyte being maintained at 10-200 m/min. by flowing the electrolyte counter-current to the direction of travel of the steel strip.
Claim 8
Independent Claim
151 words
A method of plating steel strip at a current density higher than 5 A/dm 2 with a zinc-nickel alloy which comprises continuously passing the steel strip at a predetermined feeding rate through an electrolytic plating bath at a pH of 1.0-4.5 and a temperature of 40°-70° C. provided with at least one soluble anode made of nickel and with at least one soluble anode made of zinc, the concentration of Ni 2+ ions in the electrolyte being maintained at a level of 20 g/l or more and the concentration of Zn 2+ ions at a level of 10 g/l or more and simultaneously the molar ratio of Ni 2+ /Zn 2+ being restricted to a range of from 1.5-4.0, with the speed of passage of the steel strip relative to the electrolyte being maintained at 10-200 m/min. by flowing the electrolyte counter-current to the direction of travel of the steel strip.
Claim 9
Dependent Claim
16 words
The method defined in claim 6, in which the current density is 5-40 A/dm 2 .
Claim 10
Dependent Claim
25 words
The method defined in claim 6, in which the relative speed of the steel strip passing through the electrolytic bath is up to 100 m/min.
Claim 11
Dependent Claim
25 words
The method defined in claim 6, in which the ratio of the number of nickel anode to that of zinc anode is 1:1 to 1:4.
Claim 12
Dependent Claim
18 words
The method defined in claim 6, in which the zinc-nickel alloy contains nickel in the range of 9-20%.
Claim 13
Dependent Claim
25 words
The method defined in claim 6, in which the molar ratio of Ni 2+ /Zn 2+ is restricted to a range of 1.8 to 3.0.
Claim 14
Independent Claim
158 words
A method of plating steel strip at a current density higher than 5 A/dm 2 with a zinc-nickel alloy which comprises continuously passing the steel strip at a predetermined feeding rate through an electrolyte plating bath at a pH of 1.0-4.5 and a temperature of 40°-70° C. provided with at least one insoluble anode, the concentration of Ni 2+ ions in the electrolyte being maintained at a level of 20 g/l or more, the concentration of Zn 2+ ions at a level of 10 g/l or more and simultaneously the molar ratio of Ni 2+ /Zn 2+ being restricted to a range of 1.5-4.0, with the speed of the steel strip relative to the counter-current flow of the electrolyte being maintained at a rate of 10-200 m/min. by adjusting the counter-current flow rate of the electrolyte and supplying additional Ni 2+ and Zn 2+ ions to the electrolyte in the form of a basic compound thereof during operation.
Claim 15
Independent Claim
158 words
A method of plating steel strip at a current density higher than 5 A/dm 2 with a zinc-nickel alloy which comprises continuously passing the steel strip at a predetermined feeding rate through an electrolyte plating bath at a pH of 1.0-4.5 and a temperature of 40°-70° C. provided with at least one insoluble anode, the concentration of Ni 2+ ions in the electrolyte being maintained at a level of 20 g/l or more, the concentration of Zn 2+ ions at a level of 10 g/l or more and simultaneously the molar ratio of Ni 2+ /Zn 2+ being restricted to a range of 1.5-4.0, with the speed of the steel strip relative to the counter-current flow of the electrolyte being maintained at a rate of 10-200 m/min. by adjusting the counter-current flow rate of the electrolyte and supplying additional Ni 2+ and Zn 2+ ions to the electrolyte in the form of a basic compound thereof during operation.
Claim 16
Dependent Claim
49 words
The method defined in claim 12, in which the basic compound of nickel is selected from the group consisting of basic nickel carbonate, nickel oxide and nickel hydroxide, and the basic compound of zinc is selected from the group consisting of basic zinc carbonate, zinc oxide and zinc hydroxide.
Claim 17
Dependent Claim
16 words
The method defined in claim 12, in which the current density is 5-40 A/dm 2 .
Claim 18
Dependent Claim
25 words
The method defined in claim 12, in which the relative speed of the steel strip passing through the plating bath is up to 100 m/min.
Claim 19
Dependent Claim
18 words
The method defined in claim 12, in which the zinc-nickel alloy contains nickel in the range of 9-20%.
Claim 20
Dependent Claim
25 words
The method defined in claim 12, in which the molar ratio of Ni 2+ /Zn 2+ is restricted to a range of 1.8 to 3.0.
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) | 1985-02-01 | 1985-08-03 | 1986-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-01 | 1989-08-03 | 1990-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-01 | 1993-08-03 | 1994-02-02 | $7700.00 | Window Closed / Lapsed |