Abstract
The oxidation behaviour of a commercially available Fe-22Cr alloy coated with a Co 3O 4 layer by spray-painting or plasma-spraying was investigated at 1173 K in air with 1% H 2O and compared to the oxidation behaviour of the non-coated alloy. The oxide morphology was examined with X-ray diffraction, electron microscopy, and energy dispersive X-ray spectroscopy. Cr 2O 3 developed in-between the Co 3O 4 coating and the alloy, whilst alloying elements of the substrate were incorporated in the coating, regardless of the deposition method. The coatings reduced the growth rate of the Cr 2O 3 layer as well as the evolution in contact resistance with time between two Fe-22Cr plates sandwiched around a Pt-mesh. SiO 2 developed as particles within the alloy during oxidation of the Co 3O 4 spray-painted samples, whereas SiO 2 was identified as an interfacial layer between Cr 2O 3 and the alloy after oxidation of the Co 3O 4 plasma-sprayed and the non-coated samples. The difference in morphology is suggested to be an effect of SiO 2 nucleation assisted by Kirkendall void formation.
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