Abstract
A kinetics study on AISI 316L stainless steel and ODS(Oxide-Dispersion-Strenghtened) FeAl iron aluminide was conducted concerningits corrosion behavior in moltenLi2CO3-K2CO3 eutectic at 650°C in flowingCO2-O2 gas mixtures. The corrosion resistance of FeAl ODS wasdemonstrated to be significantly superior to that of austenitic AISI 316Lsteel under all gas conditions tested in this work. At low CO2partial pressure (PCO2=0.3 atm) the corrosion rate of bothalloys decreased with time due to the formation of a protective oxidelayer. In dry CO2 gas, corrosion of AISI steel proceeded at anear-linear rate, indicative of a surface-controlled reaction. FeAl corrodedinitially following parabolic behavior, but, on further reaction, exhibitedsome weight loss. A similar behavior was also observed in a67CO2-33O2 gas mixture. Corrosion of FeAl in highCO2 gas has been postulated to initiate by acidic fluxing ofyttria particles. The attack then develops as pitting and leads to furtherreaction by general corrosion as a consequence of the formation ofactive-passive electrochemical cells between the interior of pits and theexternal surface. The weight loss of AISI 316L in67CO2-33O2 gas can be ascribed to the high oxidizing power ofthe gas causing a continuous dissolution of theCr2O3 layer into a soluble chromate.
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