Chromium-zinc anti-tarnish coating on copper foil

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

1991-03-25

1992-03-24

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

050987968

ABSTRACT:
A technique for improving the tarnish and oxidation resistance of copper and copper based alloy materials is disclosed. Copper or a copper alloy is immersed in an aqueous solution containing sodium hydroxide, zinc ions and chromium (VI) ions. While the compositional ranges may vary, the concentration of either zinc ions or chromium (VI) ions, or both, is less than 1.0 gm/1. A chromium-zinc coating is electrolytically applied. The coating provides tarnish resistance at temperatures in excess of 190.degree. C. The coating is removable by immerison in sulfuric acid. Improved results are obtained by rinsing deionized water containing a small amount of an alkaline or alkaline earth hydroxide.

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