Study on the Mechanism of Failure in the LiF–NaF–KF Molten-Salt-Purifying Processing System

Frontiers in Materials

Jianqiang Wang¹  Shuangjian Chen²  Jie Fu²  Min Ge²  Xingtai Zhou²  Leidong Xie²  Xinmei Yang²  Rui Tang²  Huajian Liu³ 

[1] Key Laboratory of Interfacial Physics and Technology, Chinese Academy of Sciences, Shanghai, China;Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, China;University of Chinese Academy of Sciences, Beijing, China;

关键词: failure;    molten fluoride salt;    blockage;    high temeprature;    corrosion;   

DOI  :  10.3389/fmats.2022.839538

来源: DOAJ

【 摘 要 】

The failure of LiF–NaF–KF molten salt processing engineering was investigated. The results indicate that the failure is related to the blockage of pipes. The mechanism of blockage was studied systemically. The results reveal that the blockage of pipes was attributed to corrosion. UNS 022N01 alloy vessel was corroded in molten salt to form KNiF3 and K2NiF4. The corrosion products were reduced by H2 to form metallic Ni, which is the precipitant in salt. The transfer of precipitant in terminal salt was stopped by incomplete root penetration, which results in one pipe blocked at the welded joint. The corrosion products were reduced by H2 to form metallic Ni and deposited on the inner surface of H2 gas outlet, which resulted in another blocked pipe.

【 授权许可】

Unknown