High temperature electrochemical reaction parameters affecting electrochemical corrosion potential of stainless steels in hydrogen peroxide environment

Abstract

ABSTRACT High-temperature electrochemical reaction parameters for stainless steels have been determined based on data measured in pure water at high temperatures to realize an analytical model that can predict electrochemical corrosion potential (ECP) of stainless steels in a hydrogen peroxide (H2O2) environment without using any adjustment parameters based on ECP data. Behaviors of measured cathodic polarization curves for H2O2 were explained well with the determined parameters. Calculated ECPs of stainless steels agreed with measured values in the cases that it was acceptable for the model to have an error range of ±0.1 V in a range from the deaerated condition to 1000 ppb (= μ g kg−1) H2O2 concentration. It is expected that the ECP model in the H2O2 environment with the determined electrochemical reaction parameters will have greater validity for, and better interpretability of, the ECPs of stainless steels determined in a boiling water reactor environment than previous models.