Method of copper-nickel-cromium bright electroplating which provides excellent corrosion resistance and plating film obtained by the method
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United States of America Patent
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Oct 2, 1990
Grant Date -
N/A
app pub date -
Nov 30, 1989
filing date -
Jun 9, 1988
priority date (Note) -
Expired
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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.
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