Method for preparing active cathodes for electrochemical...

Details Method for preparing active cathodes for electrochemical... Method for preparing active cathodes for electrochemical...

C - Chemistry, Metallurgy

25

B

204/19

C25B 11/04 (2006.01) C25D 3/12 (2006.01)

Patent

CA 1117463

Abstract of the Disclosure Active cathodes for use in electrochemical processes, for example hydrogen production, are prepared by cleaning and etching the cathodes in 10 to 25% nitric acid for 5 to 10 minutes at 35 to 45°C, and thereafter activating the cathode by galvanic coating in a bath containing 50 to 350 g/l of nickel sulphate-hydrate and 10 to 200 g/l of thiourea at a pH of 3 to 6 and a temperature of 30 to 60°C using a cathodic current density of about0.3 to 6 A/dm2. The cathode remains active for a longer period of time and the coating adheres better to the base material.

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