C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/29
C25D 3/48 (2006.01)
Patent
CA 1043734
METHOD OF ELECTROPLATING GOLD AND GOLD PLATING BATHS CONTAINING AMIDO-POLYPHOSPHATE ABSTRACT OF THE DISCLOSURE Disclosed is an aqueous composition suitable for plating gold deposits of improved brightness, and a method of plating therewith. An amido-polyphosphate compound is added to a plat- ing bath containing a gold complex, and the resulting deposits exhibit a substantial improvement in brightness. The visual quality of the deposits improves further by the additional in- clusion of a polyphosphate compound. Still further improve- ments may be obtained by the inclusion in a bath containing a gold cyanide complex of a small quantity of cobalt or nickel ion. In addition to improved brightness, the latter bath also exhibits improved hardness, an important characteristic for many applications.
224943
Deuber John M.
Lurie George R.
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