C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
204/195.8
C25C 7/02 (2006.01) C25B 11/04 (2006.01)
Patent
CA 1225066
ABSTRACT An electrode for use in electrolytic processes comprises a base of film-forming metal such as titanium with an operative outer electro- catalytic surface which is an integral surface film of a compound of the titanium base, usually the oxide, incorporating a platinum-group metal electrocatalyst, preferably iridium, rhodium, palladium and/or ruthenium as metal or oxide. The surface film is formed by the applica- tion of a dilute solution of a thermodecomposable iridium, rhodium and/ or ruthenium compound containing an agent such as HC1 which attacks the titanium base and converts metal from the base into ions which are converted to the compound in a subsequent heating step. The concentrations of this agent and of the thermodecomposable compound and the number of applied layers are such that during heating the electrocatalyst formed from the decomposed compound is incorporated fully in the surface film formed from the base. The base is usually in sheet form, but may also be a powder.
383222
Beer Henri B.
Hinden Jean M.
Eltech Systems Corporation
Gowling Lafleur Henderson Llp
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