Hot corrosion behaviour of nickel-cobalt-based alloys in a lithium molten salt

Abstract

In this study, hot corrosion behaviours of Haynes 282 (H282), Nimonic 90 (N90), and Haynes HR160 (HR160) in LiCI-Li2O molten salt were investigated at 650 degrees C under argon atmosphere. The corrosion rate was in the order of H282 ˂ N90 ˂ HR160, depending on the morphology and structure of the scale. H282 showed a localised corrosion behaviour, while N90 showed a uniform corrosion behaviour. For HR-160, intergranular corrosion was observed. The high Cr content caused intergranular corrosion in the corrosion layer. Thus, excess Cr has a deleterious effect on the corrosion kinetics during hot corrosion in LiCI-Li2O molten salt.