Abstract
The oxidation properties of iron have been investigated at temperatures in the range 800–1000° C in oxygen over the pressure range 0.3–760 Torr. A duplex scale consisting of wustite and magnetite was formed during the earliest intervals examined. Hematite grew on the magnetite surface after an induction period which decreased with increasing oxygen pressure; this oxide developed as whiskers and platelets at temperatures less than 860° C and as small grains at higher temperatures. Iron transport occurs through the scale and involves short-circuit diffusion in the hematite layer. The oxidation kinetics obeyed a parabolic law independent of oxygen pressure since multilayer scale growth was directly dependent on the lattice diffusivity of iron and the iron gradient established in the wustite layer.
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This work was sponsored by the National Research Council of Canada.
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Goursat, A.G., Smeltzer, W.W. Kinetics and morphological development of the oxide scale on iron at high temperatures in oxygen at low pressure. Oxid Met 6, 101–116 (1973). https://doi.org/10.1007/BF00614658
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DOI: https://doi.org/10.1007/BF00614658