Method of controlling the potential of electrically-floating com

Details Method of controlling the potential of electrically-floating com Method of controlling the potential of electrically-floating com

1982-07-29

1984-10-02

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204196, 204197, C25B 104

Patent

active

044746563

ABSTRACT:
A method of reducing the overvoltages for hydrogen and oxygen evolution in alkaline water electrolyzers while preventing displacement of the potential of electrically-floating cell components to a region where they are susceptible to corrosion is disclosed. The method comprises adding to the electrolyte between 0.01 and 10 gpl of vanadium ions and controlling the potential of the electrically-floating cell components so as to maintain such potential out of the region where corrosion cracking may occur by simultaneously adding between 0.1 and 20 gpl chromium ions to the electrolyte, or by using an electrical circuitry requiring no external source of power.

REFERENCES:
patent: 4160704 (1979-07-01), Kuo et al.
patent: 4345982 (1982-08-01), Ikawa et al.
"The Influence of Oxide Films on Stress Corrosion Cracking of Carbon Steels", by M. J. Humphries and R. N. Parkins, Proceedings of Conference on Fundamental Aspects of Stress Corrosion Cracking, pp. 384-395, NACE 1969.

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