Black chromate-treatment solution for Zn-Ni alloy plated film

Details Black chromate-treatment solution for Zn-Ni alloy plated film Black chromate-treatment solution for Zn-Ni alloy plated film

1996-06-28

1998-04-07

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148267, 148268, C23C 2226

Patent

active

057359725

ABSTRACT:
A black chromate-treatment solution for Zn-Ni alloy plated film comprises 1 to 100 g/l of hexavalent chromium, 1 to 100 g/l of hydrochloric acid residues and/or sulfuric acid residues, 1 to 100 g/l of nitric acid residues and 1 to 100 g/l of at least one metal selected from the group consisting of iron, nickel, cobalt and copper. The chromate-treatment solution permits the formation of a uniform black chromate conversion film on a Zn-Ni alloy plated film having an Ni content ranging from 8 to 20% by weight without using any silver ions in a substantial amount and the resulting black film is excellent in corrosion resistance.

REFERENCES:
patent: 2393664 (1946-01-01), Thomas
patent: 3855010 (1974-12-01), Shermaitis
patent: 4776898 (1988-10-01), Verberne
patent: 5415702 (1995-05-01), Bishop et al.

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