2001 Volume 50 Issue 1 Pages 24-29
The availability of an electrochemical impedance spectroscopy (EIS) for an analysis of pitting corrosion has been discussed. In this analysis, the following problems must be worked out, i.e., a current distribution in the pitting and a time variation of the impedance. The current distribution was investigated by transmission line model using a glassy carbon and iron electrodes that have imitated pitting (cylindrical pore). On the other hand, the time variation of impedance amplitude cannot be neglected since the dissolution rate of metal is very large and the nature of the pitting changes with time. The time variation was compensated by the method using a spline function. In the present paper, the analytical method by EIS to solve the abovementioned problems was proposed.