Cyanide-free zinc plating bath and process

Details Cyanide-free zinc plating bath and process Cyanide-free zinc plating bath and process

C - Chemistry, Metallurgy

25

D

204/37

C25D 3/22 (2006.01)

Patent

CA 1116121

ABSTRACT An improved non-cyanide, alkali type zinc plating bath and method is provided, wherein a water-soluble polyamine sulfone compound and a quaternary pyridine compound are added to the zinc plating bath, which is thereafter subjected to electro-deposition conditions and wherein the polyamine sul- fone is represented by the general formula Image wherein each of R1 and R2 is a member selected from the group consisting of hydrogen, an allyl group, straight-chain and branched-chain alkyl groups each having 1 to 16 carbon atoms, an aralkyl group, and hydroxyalkyl groups of the general formula HO -(-CH2)m, where m is an integer of 1 to 6; ? is a member selected from the group consisting of halogen ion, HSO4?, HSO3?, and CH3COO?; "n" is an integer such that the number average molecular weight becomes 2,000 to 350,000; and "a" and "b" are natural numbers having a relation such that a:b ? 100:(10 to 100) and wherein the preferred quaternary pyridine compound is N-benzyl-3-methyl-carboxylate pyridinium chloride, and the preferred polysulfone compounds are quaternized polyamine sulfones.

304596

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