Electrochemical Corrosion Behavior of 904L Stainless Steel under Constant Load

The anodic polarization behavior and the sensitivity to Cl^- of 904L super austenitic stainless steel under different loading conditions were studied by electrochemical methods. The results show that the anodic polarization of 904L stainless steel can be significantly changed by applying constant load. With the increase of tensile stress, the anodic current density increased rapidly, the number of surface pitting increased, the resistance of passivation film gradually decreased and the pitting sensitivity increased. In addition, both constant load and Cl^- concentration affected the Cl^- sensitivity of 904L stainless steel. When the mass fraction of Cl^- was less than 5%, the addition of constant load could greatly change the sensitivity of Cl^- of 904L, and the breakdown potential significantly shifted negatively. When the mass fraction of Cl^- was less than 5%, the influence of applied constant load on the sensitivity of 904L Cl^- decreased, and the amplitude of negative displacement of the breakdown potential decreased.