PUBLICATION: FRONTIERS IN MATERIALS

AUTHORS: Liu, HJ; Chen, SJ; Fu, J; Yang, XM; Tang, R; Ge, M; Wang, JQ; Zhou, XT; Xie, LD

 

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 (022)N01 alloy vessel was corroded in molten salt to form KNiF3 and K2NiF4. The corrosion products were reduced by H-2 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 H-2 to form metallic Ni and deposited on the inner surface of H-2 gas outlet, which resulted in another blocked pipe.

 

LINKS: http://dx.doi.org/10.3389/fmats.2022.839538