Gold sulphite electroplating solutions

Details Gold sulphite electroplating solutions Gold sulphite electroplating solutions

C - Chemistry, Metallurgy

25

D

204/29

C25D 3/48 (2006.01) C25D 3/62 (2006.01)

Patent

CA 1244373

ABSTRACT OF THE DISCLOSURE An electroplating bath solution comprising an alkali metal or ammonium gold sulphite, a water soluble salt of thallium metal to effect brightening and grain refinning, 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 electro- plating solutions is also described and claimed.

444728

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