The analysis of Lissajous' figures obtained from voltage and electric current-time curves measured by using 1-P all wave rectifier on anodizing Al has been studied in various electrolytes. Both a small and a large peak in the current wave form on anodizing Al in 1M H
2SO
4 were found on a synchroscope as the voltage increased. The former (Ic) was the charge current for forming a barrier layer and the latter (Ip) was ionic current for forming a porous film. The voltage, at which the current showed zero ampere, coincided with the voltage (Eb) refered to the barrier layer. Lissajous' figures on anodizing Al in H
2SO
4 and C
2O
4H
2 showed a figures for the porous film formation having a Ip peak on the left side. In anodizing Al in 5% ammonium borate, Ip decreased immediatly via a maximum with increasing voltage and Ic only was observed to be stabilized after a few seconds. Lissajous' figure in this state was smaller in size and had many small peaks. On the other hand, on anodizing Al in conc. HNO
3, only Ip was observed in the current wave and Lissajous' figures were not clear. On anodizing Al in monobasic acids, the barrier layer growth followed by the formations of porous layer was not recognized. The wave form in the case of anodic dissolution of Cu in H
2SO
4 was similar to the one of anodizing of Al in HNO
3. Reanodizing Al in HNO
3 (10V) after anodizing in H
2SO
4 (20V) was possible, but the voltage (Eb) refered to the barrier layer decreased with elapsed time. After a long time reanodizing (10V) in HNO
3, the porous film was removed due to the dissolution of the barrier layer.
抄録全体を表示