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• Uncoated 316 stainless steel shown significant deterioration in the ZnCl₂-KCl environment due to intense molten salt corrosion, resulting in material loss and oxide scale spallation. • Ni-Cr-Mo coated 316 stainless steel exhibited superior corrosion resistance compared to uncoated steel; nonetheless, localized pitting and intergranular corrosion were noted during extended exposure. • NiCrAlY-coated 316 stainless steel exhibited superior corrosion resistance in the ZnCl₂-KCl environment; however, prolonged exposure resulted in Yttrium-related oxide spallation and microcrack development, diminishing coating efficacy. High-temperature corrosion poses a significant challenge to the longevity and performance of materials in extreme environments. This study investigates the corrosion behavior of coated and uncoated 316 stainless steel (SS) in ZnCl 2 -KCl eutectic molten salt vapor at 600°C. Contrary to expectations, the results indicate that uncoated 316 SS exhibits lesser corrosion compared to certain coated samples over prolonged exposure. Comprehensive analysis, including weight change measurements, electrochemical evaluations, and surface morphology examination, reveals the degradation mechanisms and the efficacy of coatings. Amongst the various materials used for study, NiCrMo coated 316SS showed least corrosion rate of 8.34 mpy and 3.2 mpy after 20 hours and 100 hours respectively. The findings provide insights into optimizing material protection strategies in harsh chloride containing molten salt environments.
Mangaladevi et al. (Thu,) studied this question.