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

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 (=$\mathit{\mu }$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.

KEYWORDS:

• BWR
• ECP
• polarization curve
• cathodic reaction
• stainless steels
• H₂O₂
• Radiation Chemistry
• corrosion

Disclosure statement

No potential conflict of interest was reported by the authors.