Method of in situ plating of an active coating on cathodes of al

Details Method of in situ plating of an active coating on cathodes of al Method of in situ plating of an active coating on cathodes of al

1977-07-27

1978-08-01

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204 26, 204 35R, 204 43Z, 204 43T, C25D 502, C25D 548, C25D 704

Patent

active

041041330

ABSTRACT:
An active metal coating which lowers the hydrogen discharge overpotential at the cathode in the electrolysis of aqueous alkali metal halide solutions is deposited on the cathode tubes of a cathode can of an electrolysis cell without the removal of the tubes from the can. Plating solution and anodes of plating metal are placed inside a cathode can and the components are electrically connected so as to deposit an active coating onto the cathode tubes. The plating metal is preferably an alloy of nickel and zinc and the process involves the final step of leaching the zinc component of the alloy deposit from the plated cathode tubes to provide a porous, active nickel surface which results in a reduction of the hydrogen discharge overpotential for the electrolysis of alkali metal halides, particularly sodium chloride.

REFERENCES:
patent: 1759171 (1930-05-01), Soderberg et al.
patent: 2726201 (1955-12-01), Prine
patent: 3385363 (1968-05-01), Hamby, Jr. et al.
patent: 3857764 (1974-12-01), Jumer

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