Abstract
Corrosion tests of pure metal Cr were performed in molten FLiNaK (46.5mol% LiF-11.5mol% NaF-42mol% KF) salt at 700°C for 500h using graphite crucible and Ni crucible, in order to investigate the interaction effect of Cr and the container materials in molten salt environments. Results indicate that the container materials accelerated the corrosion process owing to different electromotive potentials between metal Cr and the crucibles, and promoted formation of Cr-rich films on the surface of crucibles. The Cr-rich film on the graphite crucible was identified to be Cr7C3 with a little amount of Cr23C6. Whereas the Cr deposited on the Ni crucible surface and formed Ni–Cr alloy by thermal diffusion mechanism.
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