Gold-colored silver-cadmium-nickel alloy for electrodeposited du

Details Gold-colored silver-cadmium-nickel alloy for electrodeposited du Gold-colored silver-cadmium-nickel alloy for electrodeposited du

1982-09-13

1983-09-06

Lewis, Michael L.

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428673, 368280, 368295, B32B 1500

Patent

active

044030169

ABSTRACT:
Disclosed is a silver-cadmium-nickel alloy coating including small but effective amounts of cadmium and nickel, namely, at least, about 6 weight percent cadmium and 0.5 weight percent nickel, to impart a gold-color to the coating substantially equivalent to that of a 12-16 karat gold layer of similar thickness. The gold-colored alloy coating can replace a 12 karat gold inner layer in a duplex coating having a 22 karat gold outer layer, and thereby provide substantial savings in gold.
A highly alkaline aqueous cyanide plating bath is employed in the electroplating process in conjunction with increased current density to ensure that a critical minimum amount of cadmium is deposited in the alloy coating.

REFERENCES:
patent: 1548432 (1925-08-01), Belous
patent: 1896410 (1933-02-01), Leach
patent: 2080811 (1937-05-01), Emmert
patent: 2151905 (1939-03-01), Emmert
patent: 2311436 (1943-02-01), Gwynn, Jr.
patent: 3953246 (1976-04-01), Wilson et al.
Brenner, A. Electrodeposition of Alloy, Principles and Practice, vol. I, Academic Press, pp. 658-678, (1963).
E. Raub and B. Wollhurst, Der Aufbare Galvanischer Legierungsniederslage, 4 Die Silber-Kadmium Legierungen, Metalforsch. 2, 33-41 (1947).

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