Method for producing black colored steel strip
First Claim
1. A method for producing a black colored strip wherein a Zn-Ni plated steel strip is subjected to an electrolysis in an electrolyte solution containing 75 to 200 g/l of at least one member selected from the group consisting of hydroxide, sulfate, and chloride of sodium, potassium, or nickel;
- 2 to 100 g/l of nitrate ion; and
at least one member selected from an inhibitor and a complexing agent in an amount sufficient to prevent corrosion products from being deposited on the steel strip.
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Accused Products
Abstract
A black colored steel strip having improved degree of blackness and uniform appearance is prepared by subjecting a Zn-Ni alloy plated steel substrate to anodic electrolysis or alternating current electrolysis in an electrolyte solution containing at least one member selected from the group consisting of hydroxide, sulfate, and chloride of sodium, potassium, or nickel; nitrate ion; and at least one member selected from an inhibitor and a complexing agent.
4 Citations
6 Claims
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1. A method for producing a black colored strip wherein a Zn-Ni plated steel strip is subjected to an electrolysis in an electrolyte solution containing 75 to 200 g/l of at least one member selected from the group consisting of hydroxide, sulfate, and chloride of sodium, potassium, or nickel;
- 2 to 100 g/l of nitrate ion; and
at least one member selected from an inhibitor and a complexing agent in an amount sufficient to prevent corrosion products from being deposited on the steel strip. - View Dependent Claims (2, 3, 4, 5, 6)
- 2 to 100 g/l of nitrate ion; and
Specification