Corrosion kinetics of pure metals (Fe, Cr, Ni) and alloys (A709, SS316) in thermal and chemical purified molten chloride salt

-KCl-NaCl salt to explore the underlying corrosion mechanisms. It was found that the corrosion of metals and alloys in the salt was governed by the diffusion of corrosive impurities at temperatures of 600, 650, and 700 °C. The corrosion rates of each metal/alloy were determined using Tafel analysis under impurity diffusion-controlled conditions. The results showed that the corrosion resistance hierarchy for pure metals was Ni > Fe > Cr, while for alloys, SS316 demonstrated superior corrosion resistance compared to A709 within the tested temperature range and conditions.