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Phase composition and macrostructure of the surface oxide films formed during the oxidation of hot-rolled low-carbon rimming steel in air at 600 °C have been investigated by standard and grazing incidence x-ray diffraction. The oxidation kinetics have been analysed by the weight change method. It has been revealed that the oxide film consists of layers of FeO, Fe3O4 and Fe2O3. The latter two phases have been observed after 2 min of oxidation, whereas the first one appears only after 6 min of annealing in air at 600 °C. The oxidation kinetics obeys a logarithmic law during the whole investigated time interval of annealing.
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Iordanova et al. (2000) studied this question.
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