Process for imparting a dark patina to low-melting metal article

Details Process for imparting a dark patina to low-melting metal article Process for imparting a dark patina to low-melting metal article

1973-12-17

1976-01-06

Pitlick, Harris A.

Metal treatment

Compositions

Heat treating

29199, 148 614R, C23C 300, C23F 502

Patent

active

039308987

ABSTRACT:
A process for imparting a dark patina to the surface of an article formed from a low-melting alloy metal, the alloy metal being an alloy metal of two or more metals selected from the group consisting of Bi, Pb, Sn and Cd, comprising exposing the alloy metal surfaces of said article to an acid solution of a copper salt.

REFERENCES:
patent: 153726 (1874-08-01), Shaw
patent: 282754 (1883-08-01), Morton
patent: 3238059 (1966-03-01), Stobierski
patent: 3577282 (1971-05-01), Schubert
Fishlock, "Black Finishes for Metals," Metal Finishing, Sept. 1963, pp. 56-59,65.

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