Estimation of kinetic parameters of the corrosion layer constituents on steels in supercritical water coolant conditions

A model for the distribution of individual metallic constituents (Fe, Cr, Ni, Mn) in the corrosion layers on steels in supercritical water is proposed. A detailed description of the model concept and the calculation procedure is given. To verify and validate the model, its predictions are quantitatively compared to depth profiles of the oxides on ferritic–martensitic and austenitic steels as estimated by surface analytical techniques. Estimates of kinetic and transport parameters of the oxidation process for ferritic–martensitic and austenitic stainless steels in supercritical water are obtained. Predictive calculations of the growth kinetics of the respective oxides are presented and discussed.

► A model for the distribution of metallic constituents in corrosion layers on steel in supercritical water proposed. ► The model quantitatively compared to surface analytical data for AISI 316 and P91 steels. ► Estimates of kinetic and transport parameters of oxidation in supercritical water obtained. ► Predictive calculations of the growth kinetics of the oxides are presented and discussed.