Study on Molten Salt Corrosion Behavior of Several Stainless Steel Alloys

Abstract

Abstract Molten salt corrosion tests were performed on several stainless steels, which were 622,316, A59,625, 686,2#825,3#825 and M400. After corrosion at 680°C for 120 h, the sequence of alloys’ mass loss was 625<3#825<A59<622< 2#825<316<686<M400. SEM/EDS analysis was used to observe the surface and cross-section morphologies of the corroded samples. The alloys with high molten salt corrosion resistance formed Cr2O3 oxide layers on the surfaces of the samples, the formation of TiO2 could also enhance the corrosion resistance. However, Mn element was harmful to the alloys used in chlorine induced corrosion environment.