Abstract
Oxidation studies were carried out in oxygen at 800°C, on a series of pure binary iron-based alloys with between 1.9 and 9.8 wt. % aluminum. The results are presented in conjunction with the existing literature and these permit the development of a classification of scale morphologies based on alloy composition. Alloys with less than about 2.4 wt. % aluminum form bulky stratified scales composed of Fe2O3 and Fe3O4 with FeAl2O4 and Al2O3 at the scale-metal interface. Alloys with between 2.4 and 6.9 wt. % form an external Al2O3 scale but this is interspersed with iron oxide nodules that penetrate the alloy substrate. Only alloys with greater than 6.9 wt. % aluminum form completely protective Al2O3 scales. Models based on oxide nucleation are presented for the growth of bulky scales and also the iron oxide nodules.
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Tomaszewicz, P., Wallwork, G.R. Observations of nodule growth during the oxidation of pure binary iron-aluminum alloys. Oxid Met 19, 165–185 (1983). https://doi.org/10.1007/BF00666643
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DOI: https://doi.org/10.1007/BF00666643