Corrosion behaviour of stainless steels and a single crystal superalloy in a ternary LiCl-KCl-CsCl molten salt

摘要

In the present work, the corrosion properties of a low-carbon stainless steel (X2CrNil8-9) and a Ti-sta-bilised high-carbon stainless steel (X6CrNiTil8-10) were investigated in a molten LiCl-KCl-CsCl salt at 400, 500, and 600 ℃ for 1, 3, 9 and 27 h. In addition, a Ni-based superalloy (CMSX-4) was tested at 800 ℃ for 3 h. The low-carbon steel revealed severe intergranular corrosion for all testing conditions, whereas the Ti-stabilised steel was protected against intergranular corrosion by a Cr_2O_3 passive layer for short exposure times and up to a temperature of approximately 500 ℃. In comparison, CMSX-4 revealed superior corrosion resistance.