Chromium-zinc anti-tarnish coating for copper foil

Details Chromium-zinc anti-tarnish coating for copper foil Chromium-zinc anti-tarnish coating for copper foil

1992-03-20

1993-07-27

Zimmerman, John

Stock material or miscellaneous articles

All metal or with adjacent metals

Foil or filament smaller than 6 mils

428658, 428674, 428935, B32B 1520

Patent

active

052309320

ABSTRACT:
A technique for improving the tarnish and oxidation resistance of copper and copper based ally material is disclosed. The material is electrolytically coated by immersion in an aqueous electrolyte containing sodium hydroxide, zinc ions and chromium (VI) ions. The deposited coating is a codeposited layer of zinc and chromium with a zinc to chromium ratio of from about 5:1 to about 12:1. The coating provides tarnish resistance at temperatures in excess of 190.degree. C. and is removable by immersion in sulfuric acid.

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