Anode for alumina electrolysis with cerium oxycompound coating and inhibiting agent

Abstract From the Canadian patent

A method of producing aluminum by electrolysis of alumina which is dissolved in a molten cryolite bath is described which uses a dimensionally stable anode comprising a substrate composed of a conductive ceramic a cermet, a, metal, an alloy, an intermetallic compound and/or carbon and a coating thereon comprising a rare earth metal oxide or a rare earth metal oxyfluoride which is preserved by maintaining a concentration of the rare earth metal in the electrolyte. By adding to the bath a contamination inhibiting agent the contamination of the aluminum by substrate components due to corrosion of the substrate by the electrolyte contacting the substrate at imperfections of the coating may be …