Blush-free acid zinc electroplating baths and process

Details Blush-free acid zinc electroplating baths and process Blush-free acid zinc electroplating baths and process

1982-05-20

1983-09-20

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

C25D 322

Patent

active

044054130

ABSTRACT:
A bright acid zinc plating bath uses a surfactant or wetting agent having the general formula C.sub.n H.sub.2n+1 (OCH.sub.2 CH.sub.2).sub.x OCH.sub.2 COOH wherein n is either 8 or 9, and wherein between 30 and 70% of the surfactant contains between 17 and about 21 ethylene oxide groups and 70-30% contains between about 9 and about 12 ethylene oxide groups. When used with organic brighteners, the blend of surfactants permits the electrodeposition of a bright layer which resists the formation of haze or blush which can occur when a plated part is flexed or is subjected to elevated temperatures encountered, e.g., upon curing of a protective lacquer coating.

REFERENCES:
patent: 3909374 (1975-09-01), Skimin
patent: 4070256 (1978-01-01), Hsu et al.
patent: 4146441 (1979-03-01), Willis
patent: 4226682 (1980-10-01), Popescu
patent: 4229268 (1980-10-01), Lowery et al.

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