抄録
A corrosion monitoring method is proposed using electrochemical techniques based on AC impedance theory. Monitoring corrosion rates by the AC impedance method with a low frequency response is time consuming. A method of monitoring to obtain corrosion rates easily by using a Lissajous figure technique with 60Hz commercial frequency was applied to pitting corrosion of SUS304 stainless steel in a neutral sodium chloride solution. The value of tanθ calculated from the inclination angle θ of the Lissajous figure was found to be related to pitting current density I at an impedance Z>1 by
tanθ=K·I K: const.
The relation between the value of tan θ and the corrosion rate was discussed in terms of reaction processes of charge transfer and diffusion.
