In order to study the high temperature corrosion behavior of different types of stainless steel in mixed molten salt, different-duration static immersion corrosion experiments were conducted on 2205 duplex stainless steel and 316L stainless steel in potassium-sodium mixed molten salt(KCl +Na2SO4+K2SO4)at different temperatures, and the phase composition, surface corrosion morphology, micro-area composition and corrosion kinetic curve of the two materials were studied.Results showed that oxidation corrosion occurred for the two materials, and they both had similar parabolic corrosion kinetic characteristics, the corrosion mass rapidly increased and then slowly increased in unit area with the increasing corrosion time.After the high temperature corrosion at 600 ℃ and 650 ℃ for 24 h, 2205 duplex stainless steel and 316L stainless steel had similar high temperature corrosion laws, and the mass loss of the two steels reached about 5 mg/cm2 and 8 mg/cm2, respectively.The corrosion rate of 316L stainless steel was significantly lower than that of 2205 duplex stainless steel at 700 ℃, which was due to the rapid formation of corrosion product layers of NiCr2O4, NiFe2O4 and NiO on the steel surface.These corrosion products could effectively slow down the corrosion rate, thus presenting a good protective effect on the substrate.
