抄録
The effect of rotation rate upon potential and etch rate of a steel was examined utilizing a rotating steel disk electrode. Being based upon these experiments, etching mechanism was discussed.
The principal ingredient of etchants was FeCl3. The concentration of FeCl3, FeCl2 and free HCl were 3.7 to 4.1mol dm-3, 0.17±0.02mol dm-3 and 0.15±0.02mol dm-3, respectively. The temperature of the etchants was maintained at 70°C and rotation rate of the steel disk was set at 400∼4900rpm. The etch rate was obtained from the weight loss.
The etch rate and square root of rotation rate are in proportionate relations at any concentrations of FeCl3. The anodic reaction is controlled by surface reaction process, while the catholic reaction proceeds under mass transfer control.
