Abstract
In this study, observation of the reaction of H2O2 at the surface of stainless steel utilizing electrochemical impedance spectroscopy (EIS) directly in the high purity water at 288oC was performed to determine the corrosive condition and the corrosion behavior of the stainless steel in high temperature and high purity water containing H2O2. Obtained results were summarized as follows; 1) The EIS data were measured directly in high temperature water without electrolyte injection. 2) The conductivity of the high temperature water at 288oC calculated by Rsol was 8.3x10-6S/cm. 3) The Rp was 9.0x103ohm•cm2 for 100ppb of H2O2, and the estimated corrosion rate was about 30μm/year. 4) The reciprocal of the polarization resistance had a linear relationship to the H2O2 concentration. It indicated that the corrosion current would be determined by the cathodic reaction of H2O2. 5) The estimated DH2O2 was 1.5x10-4cm2/s.
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