US3986843A
Expired / Lapsed
US
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Process for manufacturing chromated electro-galvanized steel sheet and sheet made thereby
Assignee: JFE Engineering Corp
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Filing: 1975-12-19
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Granted: 1976-10-19
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Expires: 1995-12-19
Abstract
Abstract In a Zn-ion based acidic galvanizing bath containing one additive selected from the group consisting of: ______________________________________ (a) Cr 3 + 50 - 700ppm, (b) Cr 6 + 50 - 500ppm, and (c) Cr 3 + and Cr 6 + 50 - 700 ppm, in which Cr 6 + being 500ppm at the maximum; ______________________________________ And at least one additive selected from the group consisting of:______________________________________(d) Sn ion 10 - 5,000ppm, and(e) In ion 10 - 3,000ppm,______________________________________ A steel sheet is subjected to an electro-galvanizing treatment, and then, said electro-galvanized steel sheet is subjected to a conventional chromate treatment.
Inventors
- 👤 Takeshi Adaniya
- 👤 Masaru Ohmura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:37
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/48; C25D3/00; C25D3/02; C25D3/22; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12583; Y10T428/12771; Y10T428/12785; Y10T428/12792; Y10T428/12799
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
129 words
In a process for manufacturing a chromated electro-galvanized steel sheet, which comprises subjecting a steel sheet to an electro-galvanizing treatment in an acidic galvanizing bath, and then subjecting said electro-galvanized steel sheet to a chromate treatment, the improvement characterized by: subjecting a steel sheet to an electro-galvanizing in a Zn-ion based acidic galvanizing bath containing one additive selected from the group consisting of: ______________________________________
(a) Cr.sup.3.sup.+ 50 - 700ppm,
(b) Cr.sup.6.sup.+ 50 - 500ppm, and
(c) Cr.sup.3.sup.+ and Cr.sup.6.sup.+
50 - 700ppm, in which
Cr.sup.6.sup.+ being 500ppm at the maximum,
______________________________________ and at least one additive selective from the group consisting of: ______________________________________
(d) Sn ion 10 - 5,000ppm, and
(e) In ion 10 - 3,000ppm,
______________________________________ and then, subjecting said electro-galvanized steel sheet to a conventional chromate treatment.
Claim 2
Dependent Claim
129 words
In a process for manufacturing a chromated electro-galvanized steel sheet, which comprises subjecting a steel sheet to an electro-galvanizing treatment in an acidic galvanizing bath, and then subjecting said electro-galvanized steel sheet to a chromate treatment, the improvement characterized by: subjecting a steel sheet to an electro-galvanizing in a Zn-ion based acidic galvanizing bath containing one additive selected from the group consisting of: ______________________________________
(a) Cr.sup.3.sup.+ 50 - 700ppm,
(b) Cr.sup.6.sup.+ 50 - 500ppm, and
(c) Cr.sup.3.sup.+ and Cr.sup.6.sup.+
50 - 700ppm, in which
Cr.sup.6.sup.+ being 500ppm at the maximum,
______________________________________ and at least one additive selective from the group consisting of: ______________________________________
(d) Sn ion 10 - 5,000ppm, and
(e) In ion 10 - 3,000ppm,
______________________________________ and then, subjecting said electro-galvanized steel sheet to a conventional chromate treatment.
Claim 3
Dependent Claim
116 words
A chromated electro-galvanized steel sheet having a galvanizing layer on the surface of said steel sheet as the first layer and a chromate layer deposited on said galvanizing layer as the second layer, characterized in that: said galvanizing layer is formed by electro-galvanizing said steel sheet in a Zn-ion based acidic galvanizing bath containing one additive selected from the group consisting of: ______________________________________
(a) Cr.sup.3.sup.+ 50 - 700ppm,
(b) Cr.sup.6.sup.+ 50 - 500ppm, and
(c) Cr.sup.3.sup.+ and Cr.sup.6.sup.+
50 - 700ppm, in which
Cr.sup.6.sup.+ being 500ppm at the maximum,
______________________________________ and at least one additive selected from the group consisting of: ______________________________________
(a) Sn ion 10 - 5,000ppm, and
(e) In ion 10 - 3,000ppm.
______________________________________
Claim 4
Dependent Claim
116 words
A chromated electro-galvanized steel sheet having a galvanizing layer on the surface of said steel sheet as the first layer and a chromate layer deposited on said galvanizing layer as the second layer, characterized in that: said galvanizing layer is formed by electro-galvanizing said steel sheet in a Zn-ion based acidic galvanizing bath containing one additive selected from the group consisting of: ______________________________________
(a) Cr.sup.3.sup.+ 50 - 700ppm,
(b) Cr.sup.6.sup.+ 50 - 500ppm, and
(c) Cr.sup.3.sup.+ and Cr.sup.6.sup.+
50 - 700ppm, in which
Cr.sup.6.sup.+ being 500ppm at the maximum,
______________________________________ and at least one additive selected from the group consisting of: ______________________________________
(a) Sn ion 10 - 5,000ppm, and
(e) In ion 10 - 3,000ppm.
______________________________________
References Cited (Backward Citations)
US3822118A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |