Method of electrodepositing zinc on steel prior to phosphating

Details Method of electrodepositing zinc on steel prior to phosphating Method of electrodepositing zinc on steel prior to phosphating

1984-09-21

1985-10-15

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204 381, 204 55R, C25D 322, C25D 548

Patent

active

045472696

ABSTRACT:
A process of electrodepositing zinc on steel wherein zinc-containing aqueous sulfuric acid electrolytes are used which contain one or more oxyacids of sulfur in which the sulfur has an oxidation number from +5 to +1. The phosphatizing of the resulting zinc coatings results in phosphate coatings which are virtually free of spots. Suitable oxyacids are sulfurous acid (H.sub.2 SO.sub.3), sulfoxylic acid (H.sub.2 SO.sub.2), hyposulfurous acid (H.sub.2 S.sub.2 O.sub.4) and/or thiosulfuric acid (H.sub.2 S.sub.2 O.sub.3) in the form of acids, salts and acid anhydrides. The oxyacids should be present in the electrolyte in a concentration of 0.05 to 10 g/l, preferably 0.1 to 2 g/l.

REFERENCES:
patent: 1017981 (1912-02-01), Lemetre
patent: 1607869 (1926-11-01), Colcord
patent: 3713092 (1973-01-01), Vrijburg et al.
Ernest H. Lyons, Jr., The Electrochemical Soc., vol. 80, pp. 387-398, (1941).

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