Method of copper-nickel-cromium bright electroplating which prov

Details Method of copper-nickel-cromium bright electroplating which prov Method of copper-nickel-cromium bright electroplating which prov

1989-11-30

1990-10-02

Kaplan, G. L.

Stock material or miscellaneous articles

All metal or with adjacent metals

Porous

204 41, C25D 512

Patent

active

049606530

ABSTRACT:
This invention is directed to a method of copper-nickel-chromium bright electroplating which provides excellent corrosion resistance, characterized in that said bright electroplating film comprises copper and nickel plating levers formed on a basis material or a nickel plating layer directly formed on a basis material, a microporous layer of a thickness of 0.2-2 .mu.m codeposited on said nickel plating layer by adding calcium salt and titanium oxide to Watts bath type of nickel plating bath, chromium plating layer with a thickness of 0.01-0.25 .mu.m on said microporous layer and a chromium plating surface with micropores of 20000-500000/cm.sup.2, and is directed to the plating films obtained by the method.

REFERENCES:
patent: 3152971 (1964-10-01), Tomaslewski et al.
patent: 3449223 (1969-06-01), Odekerken
patent: 3625039 (1971-12-01), Kuback et al.
patent: 3825478 (1974-07-01), Clauss et al.
patent: 3843495 (1974-10-01), Malak
patent: 3847760 (1974-11-01), Malak
patent: 3866289 (1975-02-01), Brown et al.

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