Abstract
Chloride- and sulphate-induced hot corrosion mechanisms of super austenitic stainless steel S31254 were investigated at 400–1000 °C under dry gas environment. The mixed salts melted with the temperature increasing, gradually deteriorating the corrosion resistance of the steel. Starting at 600 °C, molten chloride salts accelerated corrosion following a two-stage mechanism “electrochemical corrosion + chlorine-active corrosion”. Above 800 °C, molten sulfates dissolved and destroyed corrosion layer via “basic fluxing” mechanism, causing serious internal and intergranular corrosion. Additionally, numerous precipitates formed and promoted element diffusion, further accelerating molten salt corrosion. Jointly deteriorated by molten salts and precipitates, the samples suffered catastrophic corrosion.
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