Zinc-copper alloy electroplating baths

Chemistry: electrical and wave energy – Processes and products

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C25D 358

Patent

active

039309657

ABSTRACT:
The present invention relates to additives for electroplating baths used for the electrodeposition of zinc-copper alloys, and particularly to such alloys designed to be used as undercoats for subsequently applied metal coatings. The improvement comprises additives for incorporation into conventional zinc-copper electrolytes, comprising a mixture of a buffering agent selected from the group consisting of boric acid, alkali metal borates, alkali metal carbonates, alkali metal phosphates and glycine, a metal ion selected from the group consisting of nickel ion and cobalt ion, and ethylenediaminetetra acetic acid (as the alkali metal salt).

REFERENCES:
patent: 2684937 (1954-07-01), Westbrook et al.
patent: 2916423 (1959-12-01), Passal
patent: 2989448 (1961-06-01), France
H. P. Coats, Trans. Electrochem. Soc., Vol. 80, pp. 445-457, (1941).
S. Ramachandran et al., Metal Finishing, pp. 64-68, Nov. 1968.

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