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It was observed that the oxide scale formed on the fuel side of Crofer 22 APU in a
dual gas atmosphere with current flowing is significantly different from the oxide scale
formed on the fuel side of Crofer 22 APU in a dual exposure without any current applied.
In addition to Cr2O3 and MnCr2O4, the oxide scale also contained a substantial amount of
Mn2O3 and FeCr2O4. No significant effect of current flow on oxide scale formation was
observed on the air side of the Crofer 22 APU sample exposed to a dual atmosphere.
Investigations of the specific mechanisms responsible for the observed scale growth are
in progress.
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