Fe-Cr ferritic alloys are applied for interconnects of solid oxide fuel cells (SOFCs) operated at around medium temperatures. The long-term oxidation behavior of Fe-22%Cr ferritic alloy, ZMG232L, was investigated. The oxidation rate of thin sheet was much higher than that of thick one. The effect of Cr content on oxidation resistance of ZMG232L was also investigated. The oxidation rate of low Cr alloy was higher than that of high Cr one. Therefore it was found that such accelerated oxidation occurred because Cr content decreased under oxide layer of edge part of thin sheet and Cr oxide became unstable and Fe was mainly oxidized.
Fe-Cr ferritic alloys are applied for interconnects of solid oxide fuel cells (SOFCs) operated at around medium temperatures. The oxidation behavior of sheets with various thicknesses of Fe-22%Cr ferritic alloy, ZMG232L, was investigated. The oxidation rate of thin sheet was much higher than that of thick one because Cr content decreased under oxide layer of edge part of thin sheet and therefore Cr oxide became unstable and Fe was mainly oxidized. Such accelerated oxidation behavior was able to be improved by reducing Mn, increasing Cr, and adding W.
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