Palladium electrolyte baths utilizing quaternized pyridine compounds as brighteners

Claim 1

An aqueous electrolytic palladium plating bath having a pH of between about 4 and 14 and containing a palladium compound capable of being electrolytically plated and a water soluble quarternized pyridinium brightening agent in an amount of about 0.001 g/l up to their solubility limit of about 10 g/l which in said bath provides a cation of the formula ##SPC2## in which R is a benzyl radical, a saturated or unsaturated straight, branched or cyclic C 1 -C 6 aliphatic or hydroxyaliphatic radical or a polyalkylene oxide radical and R 1 , R 2 , R 3 , R 4 and R 5 each is a hydrogen atom or a halogen atom or a lower alkyl, lower alkenyl, hydroxyl, carboxyl, amino, lower alkylol, lower alkylcarboxyl, lower alkylamine, lower alkylol amino group or a group resulting from the reaction of the hydroxyl, carboxyl, amino, lower alkylol, lower alkylcarboxyl or lower alkylamine group with an alkyl sultone, an alkyl lactone or an epoxide.