Anti-tarnish treatment of metal foil

Details Anti-tarnish treatment of metal foil Anti-tarnish treatment of metal foil

1989-12-22

1991-10-15

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

204 28, 204 351, C25D 548, C25D 706

Patent

active

050571931

ABSTRACT:
A method of imparting tarnish and corrosion resistance to a copper or copper alloy foil in which the foil is first coated with a thin layer of zinc on at least one side. Thereafter, the foil is treated with an aqueous solution of chromic acid and sulfuric acid. The foil may then be rinsed in a dilute basic solution having a pH greater than 8 and then dried.

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U.S. Patent Application Ser. No. 07/333,212, filed Apr. 5, 1989-Lin et al., for "Treatment of Metal Foil".

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