Corrision Behavior of 310S and AL-6XN Steels in Molten MgCl₂

The corrosion behaviors of 310S and AL-6XN steels in MgCl2 molten salts were studied. The corrosion products and cross-section were amalyzed by means of X-ray diffraction (XRD) and metallurgical microscopy. Both steels showed uniform corrosion. 310S had a higher initial corrosion rate than AL-6XN. The corrosion rate of both steels was slowed down and trended to zero afterward. According to the corrosion depth, corrosion grades of 310S and AL-6XN were classified as 9 and 8 respectively, indicating insufficient corrosion resistance. These two corrosion processes belonged to 3D diffusion (Ginstring-Brounshtein) kinetic model. The reaction constants were 0.0048 and 0.0081 respectively, and the kinetic equations were obtained. AL-6XN showed better corrosion resistance than 310S in MgCl2 molten salts.