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AssigneesKabushiki Kaisha Japan Metal Finishing Company, Nitto Boseki Co., Ltd.
InventorsShigeru Fujita, Koichi Murayama, Toyohito Kaneda, Susumu Harada, Toshio Ueda
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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 zincate type and subjecting the resulting bath to electrodeposition conditions. The Amphoteric polysulfone compounds have the formula ##STR1## wherein: R.sub.1 and R.sub.2 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 .times. 0.8; and n is in the range of 5 to 100.
A zinc plating process comprising adding water-soluble, amphoteric polysulfone compounds and, optionally, aromatic aldehydes to a zinc plating bath of an alkalizincate type and subjecting the resulting bath to electrodeposition conditions, said amphoteric polysulfone compounds having the formula ##STR6## wherein:
Dependencies are inferred from the claim text.