Abstract
It is important to monitor the corrosion rates of steel in electrolyte environments such as aqueous solution or soil in order to evaluate the integrity of the members of facilities. As a corrosion rate monitoring method, CIPE （Current Interrupted Polarizing Extrapolation） method was developed. By CIPE method the corrosion rate is calculated by the Tafel equation obtained from the polarization curve of the in-situ measurement. In this paper, in order to evaluate accuracy of the method, the measured corrosion rates were compared with the values calculated from mass losses of steel specimens in neutral aqueous solutions of various oxygen supplying conditions. As a result, the actual corrosion mass losses gave good agreement with the values of coulomb amounts which were calculated from the corrosion rates monitored by CIPE. Therefore it is clear that CIPE is an applicable method to real-time monitoring of corrosion rate of steel in aqueous solution. Furthermore, it was found that the corrosion rates which were limited by the oxygen diffusion rates could be measured by CIPE method.
