Abstract
The oxidation behavior of Haynes 242 alloy was studied at 700-900°C in Ar + 4 vol % H 2 + 3 vol % H 2 O which corresponds to the solid oxide fuel cell (SOFC) anode environment. The oxidation kinetics was found to obey a parabolic law and the oxidation activation energy (181.5 kJ mol -1 ) was close to that for the self-diffusion of the Cr cation in Cr 2 O 3 , indicating that the oxidation process was mainly controlled by outward diffusion of the Cr cation in Cr 2 O 3 . The oxide scale was composed mainly of Cr 2 O 3 with a thin (Mn,Cr) 3 O 4 spinel top layer. The area specific resistance of the oxide scale formed in the reducing atmosphere was found to be higher than that formed in air.
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