Zinc-cobalt alloy-plating alkaline bath and plating method using

Details Zinc-cobalt alloy-plating alkaline bath and plating method using Zinc-cobalt alloy-plating alkaline bath and plating method using

1994-10-03

1996-12-10

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Forming multiple superposed electrolytic coatings

205177, 205178, 205245, 205255, 205259, 205197, C25D 510, C25D 512, C25D 356

Patent

active

055827098

ABSTRACT:
A zinc-cobalt alloy-plating alkaline bath comprises a zinc compound, a cobalt compound, an alkali hydroxide and a reaction product of an alkyleneamine with an alkylene oxide and having a pH of not less than 13 and a method for forming a zinc-cobalt alloy plating film comprises the step of forming, on a substrate, a zinc-cobalt alloy plating film having a cobalt content ranging from 0.05 to 20% by weight and a zinc content ranging from 80 to 99.95 % by weight, while using the foregoing alkaline plating bath. The Zn-Co alloy-plating bath permits the achievement of a desired rate of Co-eutectoid even when a small amount of a chelating agent is incorporated into the bath and therefore, the bath is excellent in the disposability of waste water.

REFERENCES:
patent: 4048381 (1977-09-01), Adaniya et al.
patent: 5194140 (1993-03-01), Dobrovolskis et al.
Chemical Abstracts, vol. 91, No. 4, Jul. 23, 1979, abstract No. 29514k, Doi 'zinc-cobalt electrodeposition from alkaline baths' , page 587.

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