Method of replenishing electroless gold plating baths

Details Method of replenishing electroless gold plating baths Method of replenishing electroless gold plating baths

1995-06-07

1997-06-03

Utech, Benjamin

Coating processes

Immersion or partial immersion

Metal base

4274431, B32B 1710

Patent

active

056352530

ABSTRACT:
A replenishing solution for a cyanide-based electroless gold plating bath. The solution includes a gold(III) halide such as gold chloride, gold bromide, tetrachloroaurate (and its sodium, potassium, and ammonium salts), and tetrabromoaurate (and its sodium, potassium, and ammonium salts). The replenishing solution also may include an alkali (such as potassium hydroxide, sodium hydroxide, and ammonium hydroxide) to maintain the pH of the solution between 8 and 14. Also provided is a method of replenishing a cyanide-based electroless gold plating bath with the solution of the present invention.

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