ZINC PLATING PROCESS

摘要

ZINC PLATING PROCESS Zinc plating process comprising adding water-soluble, amphoteric polysulfone compounds having the formula (A) as set forth below and, optionally, aromatic aldehydes to a zinc plating bath of an alkali metal zincate type and subjecting the resulting bath to electrodeposition conditions. (A) wherein: R1 and R2 each independently represents a straight or branched chain alkyl group having from 1 to 4 carbon atoms or a 2-hydroxyethyl group, a is in the range of 0.03 to 0.5; b is in the range of 0.3 to 0.77; c is in the range of 0.2 to 0.4, provided that c is not greater than b x 0.8; and n is in the range of 5 to 100.