Gold sulphite electroplating solutions and methods

Details Gold sulphite electroplating solutions and methods Gold sulphite electroplating solutions and methods

1983-01-28

1984-03-06

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

204 46G, C25D 348, C25D 362

Patent

active

044352530

ABSTRACT:
An electroplating bath solution comprising an alkali metal or ammonium gold sulphite, a water soluble salt of thallium metal to effect brightening and grain refining, and a non-hydroxy, non-amino carboxylic acid such as formic acid and oxalic acid to ensure that the bright gold metal deposit has a hardness lower than about 90 Knoop. The method of depositing the bright gold metal on various substrates from such electroplating solutions is also described and claimed.

REFERENCES:
patent: 3475292 (1969-10-01), Shoushanian
patent: 3666640 (1972-05-01), Smith et al.
patent: 3776822 (1973-12-01), Baker
patent: 3980531 (1976-09-01), Ludwig et al.
patent: 3990954 (1976-11-01), Foulke et al.
patent: 4199416 (1980-04-01), Middleton et al.
patent: 4253920 (1981-03-01), Fletcher et al.

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