From the early beginning of the oxidation of 304L stainless steel in carbon dioxide at 1273 K (1 min, for a weight gain of 0.02 mg cm −2), the surface of the alloy was entirely covered by oxides: magnetite Fe 3O 4, chromia Cr 2O 3 and traces of wüstite Fe 1− x O. Later on, for weight gains approaching 1 mg cm −2, magnetite remained at the outer interface, with traces of hematite (Fe 2O 3), above a thick layer of wüstite Fe 1− x O. Magnetite and wüstite may favour adhesion of thermal plasma protective coatings such as alumina.

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