Process and apparatus for control of electroplating bath composi

Details Process and apparatus for control of electroplating bath composi Process and apparatus for control of electroplating bath composi

1991-01-28

1992-11-10

Valentine, Donald R.

Electrolysis: processes, compositions used therein, and methods

Electrolytic coating

Treating process fluid by means other than agitation or...

204105R, 204257, 204263, 204296, 204112, C25D 2112, C25D 1700

Patent

active

051620790

ABSTRACT:
A process and apparatus for electroplating metals in which the metal salt concentration within the electroplating bath is reduced by providing an insoluble anode assembly in the bath. The insoluble anode assembly includes an enclosure which defines a compartment around an insoluble anode and which is formed at least in part by an anion exchange membrane. The primary reaction at the insoluble anode during electroplating is electrolysis of water to produce predominantly oxygen and hydrogen ions. The flow of current through the insoluble anode assembly causes anions in the plating solution to travel through the anion membrane into the compartment, resulting in an increase in acid concentration within the compartment. Accumulated acid is periodically flushed from the compartment.

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Y. Kobuschi, Y. Matsunaga and Y. Noma, "Application of Ion Exchange Membranes to the Recovery of Acids by Diffusion Dialysis and Electrodialysis", Proceedings of Microsymposium on Macromolecules, Synthetic Polymeric Membranes, Walter de Gruyter & Co., New York.
A. T. Cherif, C. Gavach, T. Cohen, P. Dagard and L. Albert, 1988. "Sulfuric Acid Concentration with an Electro-Electrodialiysys Process". Hydrometallurgy, 21:191-201.

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