Electrodeposition of ruthenium-iridium alloy electrode for...

Details Electrodeposition of ruthenium-iridium alloy electrode for... Electrodeposition of ruthenium-iridium alloy electrode for...

C - Chemistry, Metallurgy

25

C

204/66, 204/196.

C25C 7/02 (2006.01)

Patent

CA 1157811

ABSTRACT An improved process for electrowinning metals from an aqueous electrolyte is disclosed. It entails using, as the anode in the electrolytic process, a composite electrode comprising a costing prepared from the bath comprising about 1-12 g/l ruthenium, about 1-12 g/l iridium, about 20-200 8/l equivalent to NaBF4) fluoborate salt, about 1-100 g/l fluoboric acid and sulfamic acid in an amount of up to 2 time the ruthenium plus iridium concen- tration. The invention includes a composite electrode comprising a conductive substrate, preferably a valve metal, and a coating of the typo referred to above.

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