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Corrosion Behavior of 20G and TP347H in Molten LiCl-NaCl-KCl Salt

Shijing Xie,Min Lei,Jiawei Sun,Chongdou Yang,Wenbo Liu,Di Yun,Xiqiang Zhao,Jie Qiu

The corrosion behavior of 20G and TP347H materials was investigated in molten LiCl-NaCl-KCl salt. The corrosion rates of these materials in molten chloride salt are high and are strongly affected by the alloying surface oxide formation. The 20G shows uniform surface corrosion with almost no protective oxide formation on the surface. In contrast, the austenitic steel TP347H exhibits better corrosion resistance in molten chloride salts due to its high Cr content. Owing to the highly corrosive nature of molten chloride salts, the Cl−in molten salt could react with oxides and alloy, inducing intergranular corrosion of austenitic steel in molten chloride salt environments.