Effects of Hydrogen Peroxide on Corrosion of Stainless Steel, (IV): Determination of Oxide Film Properties with Multilateral Surface Analyses

Corrosive conditions in BWRs are determined mainly by hydrogen peroxide (H 2 O 2 ). Then, a high temperature, high-pressure H 2 O 2 water loop was fabricated to identify the effects of H 2 O 2 on corrosion and stress corrosion cracking of stainless steel. By changing concentrations of H 2 O 2 and O 2 , in situ measurements of electrochemical corrosion potential (ECP) and frequency dependent complex impedance of test specimens were carried out and then characteristics of oxide film on the specimens were determined by multilateral surface analyses, i.e., laser Raman spectroscopy and secondary ion mass spectroscopy. The following points were experimentally confirmed.