Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Coating predominantly single metal or alloy substrate of...
Patent
1995-09-26
1997-04-01
Gorgos, Kathryn
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Coating predominantly single metal or alloy substrate of...
205156, 205244, 205243, C25D 356
Patent
active
056162324
ABSTRACT:
A process for producing a Zn--Cr alloy-electroplated steel plate, comprising immersing a steel plate in an acidic bath containing Zn.sup.+2 ions and Cr.sup.+3 ions and subjecting the steel plate to electroplating in the bath, wherein 0.01 g/-20 g/l of an additive comprising one or more members selected from the group consisting of polyethyleneoxyphenol derivatives with a sulfonic group (--SO.sub.3 H), sulfate group (--SO.sub.4 H), amino group (--NH.sub.2), carboxyl group (--COOH), nitro group (--NO.sub.2) or halogen (--F, --Cl, --Br or --I) as a substituent in the benzene ring, alkyl sulfonic acid compounds and polyethyleneoxyalkyl sulfonic acid compounds are added to the bath. The plating process makes it possible to produce Zn--Cr alloy-properties steel plates at a low cost without the additives having any adverse effect on the properties of the plating.
REFERENCES:
patent: 4496439 (1985-01-01), Greif et al.
patent: 4877494 (1989-10-01), Kanamaru et al.
Matsumura Kenichiro
Nakazawa Makoto
Takahashi Akira
Gorgos Kathryn
Mayekar Kishor
Nippon Steel Corporation
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