Method for rinsing copper or copper base alloy foil after an ant

Details Method for rinsing copper or copper base alloy foil after an ant Method for rinsing copper or copper base alloy foil after an ant

1991-08-09

1994-10-18

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Coating predominantly single metal or alloy substrate of...

205156, 205220, C25D 548

Patent

active

053565274

ABSTRACT:
The present invention relates to a technique for improving the tarnish and oxidation resistance of copper and copper based alloy materials. A chromium-zinc coating is electrolytically applied to copper or copper based alloy surface using a caustic electrolyte solution. The coated material is then rinsed in an aqueous solution containing a phosphate salt of alkali metals or alkaline earth metals, or a borate salt of alkali metals or alkaline earth metals. The pH of the rinse solution is maintained from about 5 to about 12 and preferably from about 7 to about 10.

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