US4522892A
Expired / Lapsed
US
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Method for producing a steel strip having an excellent phosphate-coating property
Assignee: Nippon Steel Corp
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Filing: 1983-04-08
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Granted: 1985-06-11
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Expires: 2003-04-08
Abstract
Abstract A steel strip having an excellent phosphate-coating property is produced by subjecting at least one surface of the steel strip to electrolytic treatment in which the steel strip serves as an anode and the steel strip surface is brought into contact with an aqueous solution containing at least one phosphate selected from the group consisting of alkali metal phosphates and ammonium phosphate and having a concentration of phosphoric anions of 0.05 mole/l or more and a pH of from 4 to 7, at an anode current density of 2 A/dm2 or more, to an extent that a phosphate surface layer is formed in an amount of 0.0001 to 0.05 g/m2 on the metal strip surface.
Inventors
- 👤 Yoshio Shindow
- 👤 Masaya Tsutsumi
- 👤 Wataru Hotta
- 👤 Yujiro Miyauchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:19
CPC Classifications
C; C25; C25D; C25D9/00; C25D11/00; C25D11/36; C23; C23C; C23C22/00; C23C22/78; C25F; C25F1/00; 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: 10
Claim 1
Independent Claim
193 words
A method for producing a steel strip having one steel surface thereof exhibiting an excellent phosphate-coating property and the other surface thereof electroplated with a zinc-containing metallic material, comprising subjecting a steel strip having one steel surface and the other surface thereof electroplated with a zinc-containing metallic material to an electrolytic treatment in which said steel surface of said steel strip is brought into contact with an aqueous solution containing at least one phosphate selected from the group consisting of alkali metal phosphates and ammonium phosphate and having a concentration of phosphoric anions of 0.05 mole/l or more and a pH of from 4 to 7, the steel surface portion of said steel strip serves as an anode, the electrical potential of said anode is adjusted to a level at which the iron in the steel strip enters an overpassive state and the anode current density is adjusted to 2 A/dm 2 or more, to an extent that the steel surface of said steel strip is made clean and a phosphate surface layer is formed in an amount of from 0.0001 to 0.05 g/m.sup. 2 on the steel surface of said steel strip.
Claim 2
Independent Claim
193 words
A method for producing a steel strip having one steel surface thereof exhibiting an excellent phosphate-coating property and the other surface thereof electroplated with a zinc-containing metallic material, comprising subjecting a steel strip having one steel surface and the other surface thereof electroplated with a zinc-containing metallic material to an electrolytic treatment in which said steel surface of said steel strip is brought into contact with an aqueous solution containing at least one phosphate selected from the group consisting of alkali metal phosphates and ammonium phosphate and having a concentration of phosphoric anions of 0.05 mole/l or more and a pH of from 4 to 7, the steel surface portion of said steel strip serves as an anode, the electrical potential of said anode is adjusted to a level at which the iron in the steel strip enters an overpassive state and the anode current density is adjusted to 2 A/dm 2 or more, to an extent that the steel surface of said steel strip is made clean and a phosphate surface layer is formed in an amount of from 0.0001 to 0.05 g/m.sup. 2 on the steel surface of said steel strip.
Claim 3
Dependent Claim
40 words
The method as claimed in claim 1, wherein said steel surface of said steel strip to be electrolytically treated has a temporary covering layer consisting essentially of an inorganic substance and said covering layer is removed during said electrolytic treatment.
Claim 4
Dependent Claim
21 words
The method as claimed in claim 2, wherein said covering layer is in an amount not exceeding 5 g/m 2 .
Claim 5
Dependent Claim
31 words
The method as claimed in claim 2, wherein said temporary covering layer comprises a zinc-containing metallic material temporarily plated on said steel surface of said steel strip to be electrolytically treated.
Claim 6
Dependent Claim
25 words
The method as claimed in claim 4, wherein said covering layer contains a temporary conversion-coating layer formed on said temporarily plated zinc-containing metallic material layer.
Claim 7
Dependent Claim
22 words
The method as claimed in claim 4, wherein said covering layer is in an amount of 0.1 to 5 g/m 2 .
Claim 8
Dependent Claim
34 words
The method as claimed in claim 1, wherein said aqueous phosphate solution contains an additive consisting of at least 10 -5 mole/l of at least one sulfur compound containing sulfur atoms having unpaired electrons.
Claim 9
Dependent Claim
41 words
The method as claimed in claim 1, wherein said aqueous solution contains a conductivity-enhancing agent consisting of at least one strong electrolytic inorganic salt in a concentration in terms of anionic equivalent of 1/2 or less of that of said phosphate.
Claim 10
Dependent Claim
41 words
A steel strip produced by the method as claimed in any one of claims 1 to 8, which steel strip has one steel surface thereof exhibiting an excellent phosphate-coating property and the other surface thereof electroplated with a zinc-containing metallic material.
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) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |