Abstract
The oxidation behavior of pure Mg and Mg–Gd-Y-Zr alloy was studied in O2 at 300 °C with and without the presence of water vapor. The kinetics curves revealed improved oxidation resistance of Mg–Gd–Y–Zr alloy in O2, compared with pure Mg. However, when water vapor co-existed with oxygen, the oxidation rate of Mg–Gd–Y–Zr alloy was accelerated; whereas, the oxidation rate of pure Mg was restrained. Detailed XPS analysis of pure Mg oxidized with water vapor revealed that the reduced oxidation rate could be strongly linked with the outer Mg(OH)2 film. On the contrary, for Mg–Gd–Y–Zr alloy, an incomplete Mg(OH)2 film was present in the outer region of oxide layer, which can provide a ready pathway for water vapor transport to the inner part of the oxide film and which has little oxidation resistance to water vapor.
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Acknowledgements
The investigation is supported by the National Natural Science Fund of China under the contract No.50499331-6 and No.50671113. The authors are also grateful to Professor Emeka E. Oguzie for useful discussion.
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Liu, J., Li, Y. & Wang, F. The High Temperature Oxidation Behavior of Mg–Gd–Y–Zr Alloy. Oxid Met 71, 319–334 (2009). https://doi.org/10.1007/s11085-009-9145-2
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DOI: https://doi.org/10.1007/s11085-009-9145-2