Electrolyte solution and process for gold electroplating

Details Electrolyte solution and process for gold electroplating Electrolyte solution and process for gold electroplating

1987-06-01

1988-05-17

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204 475, C25D 348, C25D 362

Patent

active

047448717

ABSTRACT:
Gold plating baths comprising a nickel or cobalt brightener/hardener, containing a dicarboxylic acid having the formula HOOC--(CH.sub.2).sub.n --COOH in which n is an integer from 1 to 4 and mixtures thereof, an acid selected from the group consisting of malic acid, gluconic acid and formic acid and mixtures thereof, plus optionally oxalic acid, enable the use of high current densities with attainment of improved efficiencies in producing bright deposits; also enable bright deposits to be obtained at high temperatures of about 150.degree. F.

REFERENCES:
patent: 3149057 (1964-09-01), Parker
patent: 3149058 (1964-09-01), Parker
patent: 3776822 (1973-12-01), Baker
patent: 3893896 (1975-07-01), Korbelak et al.
patent: 3929595 (1975-12-01), Biberbach et al.
patent: 4075065 (1978-02-01), Korbelak et al.
patent: 4436595 (1984-03-01), Matson
patent: 4615774 (1986-10-01), Somers et al.
patent: 4670107 (1987-06-01), Lochet
"Continuous Reel-to-Reel Plating for the Electronics Industry", by Jean A. Lochet et al, an American Electronics Society Lecture, (1983).

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