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Effects of a Steam Pre-treatment on the Formation and Transformation of Alumina Phases on Fe Aluminide Coatings

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Abstract

Several researchers have studied the transformation of metastable aluminas (γ- and θ-) to α-Al2O3 but very little is known regarding alumina scales formed under water vapour and their transformation to α-Al2O3. Some results have indicated that water vapour increases the oxidation rate of alumina-scale forming coatings but others have found the opposite, that is, that under water vapour the oxidation rates decrease as either transition aluminas do not form or the transformation to α-Al2O3 is accelerated. In addition, it was found that χ-Al2O3 is the only oxide that forms at the initial stages of oxidation under 100 % steam on Fe–Al coatings at 650 °C. Under these conditions, this oxide is very protective, and slowly transforms onto α-Al2O3. A preliminary study of the transformation of χ- to α-Al2O3 at 900 °C under laboratory air was carried out. χ-Al2O3 was generated by a steam pre-treatment on slurry Fe aluminide coatings deposited on P92.

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Acknowledgments

All members of the Area of Metallic Materials are acknowledged in particular, F. Gallego, D. Sayago and M. Almazán for their invaluable contributions in the experimental work and V. González and J. Garcia de Blas for their careful editing and improvement of the paper. The authors wish also to thank MINECO for financial help (ENE2008-06755-C02-01) and Vallourec Mannesmann for supplying P92.

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  1. Instituto Nacional de Técnica Aeroespacial (INTA), Área de Materiales Metálicos, Ctra. Ajalvir Km. 4, 28850, Torrejón de Ardoz, Madrid, Spain

    A. Agüero, M. Hernández & A. Santaballa

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  1. A. Agüero
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  2. M. Hernández
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  3. A. Santaballa
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Correspondence to A. Agüero.

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Agüero, A., Hernández, M. & Santaballa, A. Effects of a Steam Pre-treatment on the Formation and Transformation of Alumina Phases on Fe Aluminide Coatings. Oxid Met 79, 601–611 (2013). https://doi.org/10.1007/s11085-012-9351-1

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  • DOI: https://doi.org/10.1007/s11085-012-9351-1

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