Development of a Highly Durable IrO_2-based Anode to Cathodizing-induced Deterioration

摘要

An insoluble oxygen evolution anode consisting of an IrO_2-Ta_2O_5 catalytic layer formed on a titanium substrate has been increasingly used in electroplating industries such as electrogalvanizing and electrotinning of steels.The excellent catalytic properties and long lifetime have been recently proven in such a commercial use.However,there are some cases wherein the rapid consumption of the IrO_2-Ta_2O_5 coating occurs partially in commercial electrogalvanizing lines(EGLs).Such an anomalous deterioration of the coating is observed on the anode located outside of the width of a steel strip when the steel strip moves between two anodes and both the strip surfaces are electrogalyanized.