Tarnish resistant copper and copper alloys

Details Tarnish resistant copper and copper alloys Tarnish resistant copper and copper alloys

1974-08-05

1976-04-13

Van Balen, William J.

Metal treatment

Compositions

Heat treating

148 615R, 148 631, 428336, 428469, C23F 712, B32B 1504

Patent

active

039501930

ABSTRACT:
A method of producing a laminate having high bond strength and excellent resistance to acid undercutting comprising oxidizing copper or its alloys to form an oxide film, applying a phosphoric acid solution to the oxide film, rinsing, drying, and adhesively laminating to a plastic film. The instant case also teaches a method of producing high tarnish resistance on copper and its alloys by so oxidizing and phosphating and further teaches a flexible printed circuit wherein the unwanted copper portion of the formed laminate is etched away, characterized by high peel strength and substantially no acid undercutting of the formed circuitry.

REFERENCES:
patent: 1426771 (1922-08-01), Radu
patent: 1895175 (1933-01-01), Staples
patent: 2120212 (1938-06-01), Curtin
patent: 3434889 (1969-03-01), Haroldson et al.

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