R. Otogawa et al., EFFECTS OF CATHODIZING ON THE DURABILITY OF AN IRO2-BASED ANODE IN ANELECTROGALVANIZING LINE, Tetsu to hagane, 84(11), 1998, pp. 785-789
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.