Method for preventing cathode corrosion
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United States of America Patent
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Sep 11, 1984
Grant Date -
N/A
app pub date -
Dec 21, 1981
filing date -
Dec 21, 1981
priority date (Note) -
Expired
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Abstract
A method is provided for preventing the dissolution of transition metal-based cathodes used in chlor-alkali diaphragm cells by adding a small amount of a corrosion inhibitor, such as sodium silicate or trisodium phosphate, to the electrolytic solution during periods of interrupted current flow to the cell. The corrosion inhibitor is adsorbed on the surface of the cathode and forms an adherent protective film on the cathode. This film protects the cathode by preventing dissolution of the transition metal in the cathode coating due to oxidation by sodium hypochlorite.
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