Preparation of anodes by nickel plating and activation in a...

Details Preparation of anodes by nickel plating and activation in a... Preparation of anodes by nickel plating and activation in a...

C - Chemistry, Metallurgy

25

B

204/196, 204/25

C25B 11/04 (2006.01) C25D 11/34 (2006.01) C25F 3/02 (2006.01)

Patent

CA 1117467

ABSTRACT An improved method is disclosed for preparing active anodes for use in electrochemical processes such as water electrolysis. The anodes are cleaned and pre-treated prior to being given a galvanic nickel coating. They are then activated in a galvanic bath containing 10 to 300 g/l of nickel sulphate-hydrate and thiosulphate in an amount corresponding to 10 to 200 g/l of sodium thiosulphate. The pH of the bath is maintained at 4.5 to 6 and the temperature at 30 to 50°C. activation being carried out by the application of an anodic current density of 0.2 to 1 A/dm2 for 3 to 5 hours. The resulting activated anode exhibits a low overvoltage and remains active for a longer period.

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