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Five oxidized metallic alloy, namely, Crofer22,equivalent ZMG232, stainless steel SS430, SS304 and lnconel7l8 were subjected to oxidationon treatment in hot air environment for various period of time.
Then the resulted oxide scale was studied: with microstructure analyzed by scanning electron microscopy and X-ray diffraction,and electrical resistance was measured.
All the five alloys contain comparable amount of Cr, and their surface oxides as analyzed by SEM/EDS indicate to be some kind of Cr-O compound. Except SS304, all other four alloys exhibit not much different morphologies.