2O3/Al coating; corrosion resistance; gradient structure"/> 2O3/Al composite coating using magnetron sputtering. The corrosion resistance of the coated specimens were investigated in molten salt environment of 100 wt.% Na2SO4at 850 °C. Al2O3/Al composite coating improved the high temperature corrosion resistance of γ-TiAl alloy effectively. This good resistance was attributable to the gradient structure of Al2O3/Al composite coating which consist of an Al2O3 top-layer, an Al-rich interlayer and a diffusion layer. The results of corrosion test revealed that the Al2O3, TiO2 and TiAl3 were identified as the main phase structure of the corroded coating surface. Moreover, the sealed coating structure could effectively suppress the erosion of O2-, S- and Na+, while Al2O3/Al coating with gradient structure exhibited superior crack and spallation resistance."/>

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Enhanced high temperature corrosion resistance of Al2O3/Alcomposite coating on γ-TiAl alloy
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College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,29 Jiangjun Road,College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,29 Jiangjun Road,College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,29 Jiangjun Road,College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,29 Jiangjun Road,College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,29 Jiangjun Road,College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,29 Jiangjun Road,College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,29 Jiangjun Road,College of Material Science and Technology,Nanjing University of Aeronautics and Astronautics,29 Jiangjun Road

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    Abstract:

    γ-TiAl specimens were coated with an Al2O3/Al composite coating using magnetron sputtering. The corrosion resistance of the coated specimens were investigated in molten salt environment of 100 wt.% Na2SO4at 850 °C. Al2O3/Al composite coating improved the high temperature corrosion resistance of γ-TiAl alloy effectively. This good resistance was attributable to the gradient structure of Al2O3/Al composite coating which consist of an Al2O3 top-layer, an Al-rich interlayer and a diffusion layer. The results of corrosion test revealed that the Al2O3, TiO2 and TiAl3 were identified as the main phase structure of the corroded coating surface. Moreover, the sealed coating structure could effectively suppress the erosion of O2-, S- and Na+, while Al2O3/Al coating with gradient structure exhibited superior crack and spallation resistance.

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[Xu Yi, Liang Wenping, Miao Qiang, Wang Ling, Ren Beilei, Cui Shiyu, Xia Jinjiao, Yao Zhengjun. Enhanced high temperature corrosion resistance of Al2O3/Alcomposite coating on γ-TiAl alloy[J]. Rare Metal Materials and Engineering,2018,47(4):1075~1081.]
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History
  • Received:May 13,2016
  • Revised:July 18,2016
  • Adopted:August 18,2016
  • Online: May 31,2018
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