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Rapid Formation of α-Al2O3 Scale on an Fe–Al Alloy by Pure-Metal Coatings at 900 °C

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Abstract

Rapid formation of an α-Al2O3 scale on Fe–50 at.%Al by pure metal thin coatings of Ni, Al, Ti, Cr or Fe was investigated, and the effects of those elements on Al2O3-scale evolution were assessed. The oxidation behavior of samples with and without coatings could be divided into two groups: the samples with/without Ni and Al, and those with Ti, Cr and Fe. The mass gains of samples coated with Al and Ni were almost the same as that of non-coated Fe–50 at.%Al alloy. The mass gains of samples coated with Ti, Cr, and Fe were much lower than that of the Fe–50 at.%Al alloy. A stable α-Al2O3 scale was found to develop from the beginning of oxidation on the samples coated with Ti, Cr and Fe. However metastable θ-Al2O3 remained after long-time oxidation of non-coated and Ni- and Al-coated samples. The direct α-Al2O3 scale formation on the samples with Cr or Fe coatings was speculated to be due to sympathetic nucleation of α-Al2O3 on the surface of Al-supersaturated Fe2O3 for Fe-coated sample, and composition changes from (Cr,Al)2O3 to (Al,Cr)2O3 for the Cr-coated sample. Initial formation of an oxide having a corundum structure was inferred to provide a nucleation site for precipitation of α-Al2O3 without prior formation of a metastable Al2O3 scale.

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Acknowledgments

This research was partially supported by the Ministry of Education, Science, Sports and Culture, Grant-in-Aid for Exploratory Research, 20656115, (2008).

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Authors and Affiliations

  1. Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University, Sapporo, 060-8628, Japan

    Yuri Kitajima, Shigenari Hayashi, Toshio Narita & Shigeharu Ukai

  2. Surface and Interface Research Laboratory, Advanced Technology Research Laboratories, Technical Development Bureau, Nippon Steel Corporation, Chiba, 293-8511, Japan

    Takumi Nishimoto

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  1. Yuri Kitajima
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  2. Shigenari Hayashi
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  3. Takumi Nishimoto
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  4. Toshio Narita
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Correspondence to Shigenari Hayashi.

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Kitajima, Y., Hayashi, S., Nishimoto, T. et al. Rapid Formation of α-Al2O3 Scale on an Fe–Al Alloy by Pure-Metal Coatings at 900 °C. Oxid Met 73, 375–388 (2010). https://doi.org/10.1007/s11085-009-9184-8

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  • DOI: https://doi.org/10.1007/s11085-009-9184-8

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