PURPOSE: To provide the noble metal plating bath of a black color system which facilitates the management of the plating bath and also facilitates the management of the color tones of the alloy plating to be deposited. ;CONSTITUTION: The plating bath contg. 10 to 200g/liter carboxylic acid, 1 to 200g/liter sulfuric acid compd. or sulfurous acid compd., 1 to 50g/liter palladium and 0.1 to 30g/liter indium and having pH6 to 11 is prepd. As a result, the plating bath itself is stable and, therefore, not only the bath management is easy but also the color tones of the plating film from a pale gray color to dark brown color are easily adjustable by the metal concn. in the bath. The resulted plating film is improved in corrosion resistance as compared with the conventional black plating.;COPYRIGHT: (C)1994,JPO&Japio
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