Preventing stains on multiple-electroplated articles

Details Preventing stains on multiple-electroplated articles Preventing stains on multiple-electroplated articles

1979-11-08

1980-12-02

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

204 32R, 204 40, C25D 502, C25D 534, C25D 552

Patent

active

042369762

ABSTRACT:
A method is shown of reducing the incidence of stains on objects, such as electrical contact pins, having two or more electroplated regions. An exemplary embodiment is the case of two gold electroplating operations. After the first gold electroplating operation, the article is passed through a cyanide etching bath. The article is typically then polished, and then plated in a second electroplating operation. The etching bath removes extraneous gold deposits that can cause stains. A typical etching solution is a 0.01 molar concentration of KCN etchant and 0.1 molar KOH or K.sub.3 PO.sub.4 buffer in a water solution, typically applied by spraying.

REFERENCES:
patent: 3242090 (1966-03-01), Grunwald
patent: 3819494 (1974-06-01), Fountain
patent: 3935005 (1976-01-01), Solidum
patent: 4153523 (1979-05-01), Koontz
Electroplating and Metal Finishing, vol. 25, No. 11, pp. 9-16 (1972).
Plating, vol. 58, p. 893 et seq., (1971).

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