Abstract
Pretreatment of steel 10 in a saturated aqueous solution of NH4F substantially affects its high-temperature (250–850°C) oxidation in air. During the oxidation, the pretreated steel becomes covered with a heat-resistant film mainly consisting of Fe2O3 or Fe2O3 + Fe3O4; however, the film can either promote or impede steel oxidation depending on the isothermal exposure time.
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