EFFECTS OF CATHODIZING ON THE DURABILITY OF AN IRO2-BASED ANODE IN ANELECTROGALVANIZING LINE

The effects of cathodizing on the durability of an IrO2-based anode in an electrogalvanizing line (EGL) have been investigated. A comparison of the surface morphology of the anodes after electrolysis with anodi c, cathodic, and periodically reversed currents indicated that the par tial anomalous deterioration of the anode outside the strip width in E GL was caused by periodic cathodizing of the anode. The lifetime of th e anode during the periodically reversed electrolysis significantly de pends on the cathodic current density, the frequency of the current re versal, and the;ratio of the cathodic period to the anodic period, tit ,. The lifetime is shortened with an increase in the cathodic current density, frequency, and t(c)/t(a). The consumption rate of the catalyt ic layer of the anode during the periodically reversed electrolysis wa s compared to that during cathodic current electrolysis. The results i ndicated that the periodic current reversal induced a significant incr ease in the consumption rate even at the same cathodic current density . The difference in the deterioration modes of the catalytic layers du ring the cathodic and periodically reversed electrolysis is also discu ssed.