Molten salt corrosion of Ni-Mo-Cr candidate structural materials for Molten Salt Reactor (MSR) systems

摘要

In the present study, the corrosion performance of three candidate Ni-Mo-Cr alloys (HASTELLOY-N (R), GH3535 (R), and MONICA (R)) for Molten Salt Reactor (MSR) systems have been investigated. It is shown that the molten salt corrosion performance of these alloys is not only dependent on their chemical composition, but also on their microstructural characteristics (grain size, grain boundary length, and the presence of second-phase particles). Obtained results suggest that MONICR (R) alloy is the least affected by the exposure to the FLiNaK molten salt. This is attributed to its chemical composition, high-angle grain boundary length (grain size) and virtually no presence of large (M6C) carbides.