Abstract
Two topics about electrode are described as a peculiar problem ofthe chlor-alkali membrane process and one about electrochemicalcorrosion as a general problem of common electrolysis process. Alife of the anode converted from the mercury process was noticedto be short because OH- back-migrating from catholyte through amembrane attacked the conventional RuO2 coated as catalyst on theanode surface of titanium substrate. This problem was solved byIrO2 addition. The authors tried to separate the gas bubblequantitatively into from the electrode and from the membranesurface and obtained the most effective geometry shape ofelectrode to release the gas. Industrial cells are connected by seriesand a shunt current may cause often electrochemical corrosion. Theauthors assembled an electrolysis circuit simulator wherelaboratory rectifiers and auxiliary electrodes are installed. Thissimulator was helpful to reduce shunt current and/or prevent anozzle from electrochemical corrosion.
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