Process for forming a protective film on Cu-Sn alloys

Details Process for forming a protective film on Cu-Sn alloys Process for forming a protective film on Cu-Sn alloys

1982-12-03

1984-04-17

Silverberg, Sam

Metal treatment

Compositions

Heat treating

148 132, C23F 712

Patent

active

044432747

ABSTRACT:
A heat treatment for providing copper-tin alloys with a substantially continuous tin-phosphorous-oxide protective layer that improves the appearance and the tarnish resistance of the alloys is disclosed. The heat treatment comprises heating the alloys in a reducing atmosphere having a dew point of at least about 65.degree. F. and a temperature in the range of about 700.degree. C. to about 900.degree. C. for a time in the range of about 2 hours to about 24 hours.

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patent: 3841921 (1974-10-01), Shapiro et al.
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patent: 4116686 (1978-09-01), Mravic et al.
Copper Development Association, Inc. Standards Handbook, "Wrought Copper and Copper Alloy Mill Products, Part 2-Alloy Data", 1973, pp. 141 and 142.

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