2001 Volume 50 Issue 9 Pages 400-402
The method to determine a corrosion resistance by the electrochemical impedance with inductive behavior was discussed. The electrochemical impedance of iron electrode in sulfuric acid containing NaI shows an apparent inductive loop. In this case, two parameters concerning the resistance are obtained, namely, a charge transfer resistance in the middle frequency and a polarization resistance in the low frequency regions. Comparing the reciprocals of these resistances with Fe (II) dissolution rate, it was found that the reciprocal of the charge transfer resistance corresponded to the Fe (II) dissolution rate, and that the charge transfer resistance should be the corrosion resistance. Furthermore, the above-mentioned experimental results were examined by the discussion concerning the inductive behavior by adsorbed species.