Improvements in or relating to anodes

摘要

855,107. Corrosion-resistant electrolytic anodes. CURACAOSCHE EXPLOITATIC MAATSCHAPPIJ UTO N. V. April 3, 1958 [April 9, 1957], No. 10872/58. Class 41 An anode for use in an aqueous electrolyte containing chlorine ions or in a salt melt, e.g. of zinc chloride, has a core of titanium coated with a precious metal, i.e. gold, platinum, ruthenium, rhodium, palladium, osmium, or iridium or an alloy composed essentially of one or more of these metals, and a barrier layer of titanium oxide is formed electrolytically after the precious metal coating has been applied by anodic action through the pores in the coating. Typically the titanium core is coated with rhodium e.g. of thickness 1Á, and is then immersed as anode in dilute hydrochloric acid using a carbon anode and the applied potential is steadily raised up to 150 volts until finally current flow in the porous parts of the rhodium almost ceases. Such an electrode allows the deposition of very pure zinc from a melt of zinc chloride at 330‹C.