Mechanistic underpinning of the effect of gaseous sulfur dioxide, thermally grown oxide structure, and pre-oxidation time on the mixed deposit-induced hot corrosion of alumina-forming alloys

Key Points

• Hot corrosion rates increase significantly with exposure to sulfur dioxide and oxide structure interactions.
• Gaseous sulfur dioxide exposure notably alters the thermally grown oxide structure, impacting corrosion resistance.
• Observational analysis across various pre-oxidation times revealed distinct corrosion behaviors in alumina-forming alloys.
• Understanding these mechanisms may inform better protection strategies for alloys in high-temperature environments.