Oxidation Behavior of an Austenitic Steel (Fe, Cr and Ni), the 310 H, in a Deaerated Supercritical Water Static System

The aim of this work was to study the corrosion behavior a Fe-Cr-Ni alloy (310 H stainless steel) in water at supercritical temperature 550 °C and pressure 250 atm for up 2160 h. At temperature, is highly aggressive environment, structural materials used water-cooled nuclear reactor (SCWR) critical problem. Selecting proper candidate one key issue development SCWRs. After exposure deaerated water, oxides formed on 310 SS surface were characterized using gravimetric analysis, metallographic electrochemical methods. Gravimetric analysis showed that, due oxidation, all tested samples gained weight, oxidation 310H steel follows parabolic rate, indicating that it driven by diffusion process. data obtained microscopic metallography concord with those show layer has growing tendency time. same time, results impedance spectroscopy (EIS) measurements indicate best resistance Cr, (Fe, Mn) Cr2O4 developed after h oxidation. Based obtained, strong correlation between methods found.