Effect of exposing duration on the interaction between nickel-based alloy and SiC in molten LiF-NaF-KF salt

摘要

Effect of exposing duration on the interaction between nickel-based alloy (GH3535) and SiC in molten LiF-NaF-KF (FLiNaK) salt was investigated. The coexistence of GH3535 alloy and SiC deteriorates their corrosion in molten FLiNaK salt. Ni in alloy continuously diffuses outward and reacts with corrosion products of SiC to form nickel silicides on the surface of alloy. Meanwhile, Cr in alloy continuously diffuses into salt and reacts with SiC to form chromium carbides on the surface of SiC. The thickness of the deposition layer and the corrosion region in alloy are almost linearly increasing with the increase of exposing duration. (C) 2018 Elsevier B.V. All rights reserved.