Corrosion behaviour of 316H stainless steel in molten FLiNaK eutectic salt containing graphite particles

摘要

The effect of various concentrations of graphite particles in molten FLiNaK eutectic salt (LiF-NaF-KF: 46.5-11.5-42.0 mol.%) on the corrosion behaviour of 316H stainless steel was investigated using a static immersion corrosion technique. Higher graphite particle concentration caused severer corrosion. Weight loss, Cr depletion distance, and surface Cr carbide concentration were positively correlated with graphite particle concentration in molten FLiNaK eutectic salt. Carbon from the graphite particles in the molten FLiNaK salt diffused into the 316H stainless steel and formed Cr carbides. The rate of carbide formation on the 316H stainless steel surface was much lower than the Cr corrosion rate.