Anode for electrolysis and manufacturing method thereof

Abstract

Subject The present invention aims to provide an anode for electrolysis by an ion exchange membrane process and the manufacturing method thereof which can show a lower concentration of by-product oxygen gas in chlorine gas and a lower overvoltage stably for a long time, compared with conventional anodes. Solution to Problem The present invention is to prepare an anode for electrolysis, comprising a substrate comprising titanium or titanium alloy and a plurality of coating layers provided by the thermal decomposition baking method on the surface of the substrate, wherein the coating layer comprises the first coating layer comprising a mixture of iridium oxide, ruthenium oxide and titanium oxide, provided on the surface of the substrate, the second coating layer comprising a mixture of platinum and iridium oxide, provided on the first coating layer, a unit layer comprising the first coating layer and the second coating layer, provided on the surface of the second coating layer by a single or a plurality of layer, and the second coating layer, provided on the outermost layer of the unit layer; the plurality of layer is provided on the surface of the substrate by means of the thermal decomposition baking method and the coating layer is followed by post-baking at a higher baking temperature than the formerly applied in the thermal decomposition baking method.