Abstract
ASTM T22 (Fe-2.25Cr-1Mo), 347HFG (Fe-18Cr-11Ni), and 310H (Fe-25Cr-19Ni) steels were reacted with CO2-0.3SO2-6O2 mixed gas. During corrosion at 700-800 °C for 20-100 h, 347HFG (Fe-18Cr-11Ni), and 310H (Fe-25Cr-19Ni) steels had good protective Cr2O3 oxide scale. Corrosion rates increased progressively as the corrosion temperature and time increased. Corrosion resistance increased in the order of T22, 347HFG, and 310H, suggesting that the alloying elements of Cr and Ni beneficially improved the corrosion resistance of steels. Basically, Fe oxidized to Fe2O3, and Cr oxidized to Cr2O3, some of which further reacted with FeO to form FeCr2O4.
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