II. Fundamental Electrochemical Methods for Corrosion Study－Electrochemical Impedance－

Abstract

The present paper provides an understanding of an equivalent circuit for an electrochemical impedance spectroscopy （EIS）. First, an interpretation of the equivalent circuit composed of solution resistance, charge transfer resistance and electric double layer capacitance is explained, and an electrochemical impedance simulation is performed by using the equivalent circuit in order to understand the relationship between the impedance spectrum and these parameters. In addition, an application of EIS to corrosion monitoring of steel rebar in concrete is described based on the results of the impedance measurement by using probe electrodes embedded in concrete.