C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/15, 204/195.
C25D 1/04 (2006.01) C25B 11/04 (2006.01) C25C 7/02 (2006.01) C25D 17/10 (2006.01)
Patent
CA 1305447
ABSTRACT The present invention provides an anode for oxygen evolution consisting essentially of a substrate of a film forming metal having thereon a multilayer coating comprising an interior layer and an exterior layer. as follows. The interior layer con- sists essentially of substantially pore free platinum applied electrolytically to a thickness of at least about 150 microinches, then densified by heat treating in an oxygen containing atmosphere at from 600°C to 775°C so as to close the pores in the platinum layer. The exterior layer consists essentially of iridium oxide, and optionally not more than about 3% rhodium oxide. The exterior layer is applied by thermal decomposition of one or more thermally decompos- able iridium and, optionally, rhodium compounds in an oxygen contain- ing atmosphere at a temperature of not more than about 600°C.
518078
Engelhard Corporation
Macrae & Co.
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