Effects of Hydrogen Peroxide on Corrosion of Stainless Steel, (II): Evaluation of Oxide Film Properties by Complex Impedance Measurement

A high temperature high pressure water loop, which can control H 2 O 2 concentration with minimal oxygen (O 2 ) coexistence, has been fabricated. In order to evaluate the effects of hydrogen peroxide (H 2 O 2 ) on intergranular stress corrosion cracking. Not only static responses, i.e., electrochemical corrosion potential (ECP), of the stainless steel specimens exposed to H 2 O 2 and O 2 at elevated temperatures but also their dynamic responses, i.e., frequency dependent complex impedances (FDCI), were measured. The conclusions obtained by the experiments are as follows.