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Effect of SO42- on the corrosion of 316L stainless steel in molten FLiNaK salt

The effect of SO42- on the corrosion behavior of 316?L stainless steel (SS) in molten FLiNaK (LiF-NaF-KF: 46.5-11.5-42?mol.%) salt was studied. Results reveal that the SO42- in the salt remarkably accelerates the corrosion of 316?L SS by promoting the dissolution of Cr, leading to increasing intergranular corrosion of the alloy. On the other hand, the results of structural characterization indicate that the SO42- can react with Mn to form MnS at the grain boundaries of the alloy. The galvanic couple between MnS and steel matrix could further accelerate the intergranular corrosion of 316?L SS in molten fluoride salt environments.

» Author: Jie Qiu, Bin Leng, Huajian Liu, Digby D. Macdonald, Angjian Wu, Yanyan Jia, Wandong Xue, Guojun Yu, Xingtai Zhou

» Reference: 10.1016/j.corsci.2018.08.057

» Publication Date: 05/09/2018

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