Abstract
A study has been made of the oxidation of (001) and (112) Fe at 200–300°C in 5×10−3 Ton O2 to determine the influence of substrate orientation and surface pretreatment. Using oxidation kinetics, reflection electron diffraction, and electron optical techniques, it has been shown that the nature of the prior oxide film has a marked effect on oxidation behavior for a given orientation. The initial faster rate for a surface covered with a 16-A prior oxide film formed by dry oxidation at room temperature is attributed to a smaller sub grain size in this film, compared to that for a prior film formed by electropolishing. This initial rapid rate is not sustained because of oxide separation from the metal. α-Fe2O3 formation, which occurs at higher temperatures for either surface pretreatment, is enhanced by the oxide separation.
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