The addition of an inner salt of a quaternized pyridine carboxamide, preferably 1-benzyl pyridinium-3-carboxamide to aqueous alkaline electroplating baths containing zinc and cadmium ions results in smooth, bright deposits of these metals. High plating efficiency with low consumption of the additive compound is obtained using it either alone or in combination with small amounts of nicotinamide.
Purification Of Nickel And Cobalt Electroplating Solutions
Zinc, copper and/or iron impurities ordinarily associated with nickel or cobalt electroplating baths can be removed from solution by introducing an amount of a predetermined and selected alkylthiuram sulfide compound into the electroplating bath sufficient to convert the zinc, copper and/or iron impurities into relatively insoluble metal salts. The insoluble salts may then be removed from the bath by passing the treated solution through a standard filtering system.