Treatment of metal foil

Details Treatment of metal foil Treatment of metal foil

1989-04-05

1990-10-09

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

204 29, 204 351, C25D 534, C25D 706

Patent

active

049618288

ABSTRACT:
A treatment for metal foil, particularly copper or copper alloy foil, to be used in electrical and electronic applications wherein the bond strength of the foil is improved. The treatment includes applying an aqueous solution of chromic acid phosphoric acid to the foil, rinsing the foil in an aqueous solution having a pH of at least 8 and thereafter forming a plurality of copper or copper oxide dendritic structures on at least one side of the foil. The foil may be further treated by applying a coating of zinc or other suitable material over the dentritic structure and an anti-tarnish treatment applied. The anti-tarnish treatment includes applying a thin coating of zinc to the smooth side of the foil followed by treating the foil with a chromic acid sulfuric acid solution to provide a layer of chromate on both surfaces. The foil is then further treated by rinsing with an aqueous solution of a pH of at least 8 and dried.

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U.S. Patent Application Ser. No. 07/453,370, filed Dec. 22, 1989; Continuation of U.S. Patent Application Ser. No. 07/333,210, filed Apr. 5, 1989--Lin et al.--for "Anti-tarnish Treatment of Metal Foil".

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