Development of a Highly Durable Anode for Electrogalvanizing Lines

Ryuichi OTOGAWA*, Masatsugu MORIMITSU and Morio MATSUNAGA

Fine Chemicals Department, Daiso Co., Ltd.; 1-10-8 Edobori, Nishi-ku, Osaka-shi 550-0002 Japan
Department of Applied Chemistry, Kyushu Institute of Technology; Tobata-ku, Kitakyushu-shi 804-8550 Japan

We have developed highly durable IrO2-Ta2O5/Ti electrodes as an oxygen evolution anode in electrogalvanizing lines iEGLsj. The morphological and compositional changes of the IrO2-Ta2O5 coating during anodic electrolysis have been investigated in order to improve the durability of the electrode in commercial EGLs. Based on the experimental findings obtained, the deterioration mechanism of the coating layer and the dominant factor to determine the electrode lifetime were examined. A key point to prolong the lifetime is the corrosion inhibition of the titanium substrate, which is induced by the penetration of an electrolytic solution into the coating layer. The densification of the coating layer and the formation of a corrosion-resistive interlayer between the coating layer and the titanium substrate have successfully achieved the improved durability. The performance of the advanced IrO2-Ta2O5/Ti electrode is shown.

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