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US4407900A
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Electroplated corrosion resistant steels and method for manufacturing same
Assignee: KOBE SEIKO SHO 3-18 WAKINOHAMA-CHO 1-CHOME CHUO-KU KOBE-SHI JAPAN KK
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Filing: 1981-10-08
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Granted: 1983-10-04
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Expires: 2001-10-08
Abstract
Abstract An electroplated corrosion resistant steel, having on a base steel a first plated layer of a Zn-Ni alloy containing 5-20% of Ni and a second electroplated layer of zinc containing 0.005-0.5% of Cr. A method for producing the high corrosion resistant steel material is also disclosed.
Inventors
- 👤 Shigeki Kirihara
- 👤 Masatoshi Iwai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:55
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/56; C25D3/565; C25D5/00; C25D5/10; C25D5/12; C25D5/14; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12785; Y10T428/12792; Y10T428/12799
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
46 words
A steel material with a treated high corrosion resistant surface, comprising on a base steel a first plated layer of a Zn-Ni alloy consisting essentially of 5-20% of Ni and the balance Zn; and a second electroplated layer consisting essentially of zinc containing 0.005-0.5% of Cr.
Claim 2
Dependent Claim
46 words
A steel material with a treated high corrosion resistant surface, comprising on a base steel a first plated layer of a Zn-Ni alloy consisting essentially of 5-20% of Ni and the balance Zn; and a second electroplated layer consisting essentially of zinc containing 0.005-0.5% of Cr.
Claim 3
Dependent Claim
32 words
A steel material as defined in claim 1, wherein said first plated layer of the Zn-Ni alloy has a thickness greater than 1/20 of the total thickness of the two plated layers.
Claim 4
Dependent Claim
26 words
A steel material as defined in claim 1, wherein said second electroplated layer of Cr-containing zinc has a thickness greater than about 1 g/m 2 .
Claim 5
Independent Claim
107 words
A method for producing a steel material with a treated high corrosion resistant surface, comprising electroplating on said steel material a first layer of a Zn-Ni alloy consisting essentially of Zn and Ni in a first plating bath containing Zn and Ni wherein each concentration of Zn and Ni in said plating bath is over 20 g/l, respectively, and having a ratio of Zn concentration (g/l) to Ni concentration (g/l) in the range of 0.25-4, and electroplating on said first layer a second layer consisting essentially of Cr-containing zinc in a second electrogalvanizing bath with 0.1-10 g/l of Cr 3+ and/or 0.05-0.5 g/l of Cr 6+ content.
Claim 6
Independent Claim
107 words
A method for producing a steel material with a treated high corrosion resistant surface, comprising electroplating on said steel material a first layer of a Zn-Ni alloy consisting essentially of Zn and Ni in a first plating bath containing Zn and Ni wherein each concentration of Zn and Ni in said plating bath is over 20 g/l, respectively, and having a ratio of Zn concentration (g/l) to Ni concentration (g/l) in the range of 0.25-4, and electroplating on said first layer a second layer consisting essentially of Cr-containing zinc in a second electrogalvanizing bath with 0.1-10 g/l of Cr 3+ and/or 0.05-0.5 g/l of Cr 6+ content.
Claim 7
Dependent Claim
22 words
A method as defined in claim 4, wherein said first Zn-Ni alloy plating bath has a pH in the range of 1.5-3.5.
Claim 8
Dependent Claim
23 words
A method as defined in claim 4, wherein said first Zn-Ni alloy plating bath has a temperature in the range of 40°-70° C.
Claim 9
Dependent Claim
47 words
A method as defined in claim 4, wherein said second electrogalvanizing bath has a pH in the range of 2.5-3.5 when added with a Cr compound of Cr 3+ and a pH in the range of 3.5-4.5 when added with a Cr compound of Cr 6+ .
Claim 10
Dependent Claim
21 words
A method as defined in claim 4, wherein said second electrogalvanizing bath has a temperature in the range of 40°-70° C.
Claim 11
Dependent Claim
23 words
A method as defined in claim 4, wherein said first Zn-Ni alloy plating bath has a temperature in the range of 50°-60° C.
Claim 12
Dependent Claim
21 words
A method as defined in claim 4, wherein said second electrogalvanizing bath has a temperature in the range of 50°-60° C.
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) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |