Corrosion Behavior of 316H in NaCl-KCl-MgCl₂ Molten Salt

The corrosion behavior of 316H (stainless steel) in 700 ℃ chloride molten salt was systematically studied using a combination of static corrosion test and dynamic corrosion test. The results showed that after 1 000 hours of static corrosion, 316H exhibited significant intergranular corrosion in the unpurified molten salt, with a corrosion depth about 80 μm. In purified molten salt, the corrosion of 316H was relatively weak, and the surface of the sample after corrosion had a Cr deficient layer about 3 μm thick. After dynamic dynamic corrosion, the thickness of the Cr deficient layer on the surface of the sample was about 6 μm. Adding metal Mg to the chloride molten salt could effectively suppress the intergranular corrosion of 316H.