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Volume 24 Issue 6
Jun.  2017
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文章导航 >  矿物冶金与材料学报（英文）  > 2017  >  24(6): 681-690
Adam Khan Mahaboob Basha, Sundarrajan Srinivasan, and Natarajan Srinivasan, Studies on thermally grown oxide as an interface between plasma-sprayed coatings and a nickel-based superalloy substrate, Int. J. Miner. Metall. Mater., 24(2017), No. 6, pp. 681-690. https://doi.org/10.1007/s12613-017-1451-0
Cite this article as:
Adam Khan Mahaboob Basha, Sundarrajan Srinivasan, and Natarajan Srinivasan, Studies on thermally grown oxide as an interface between plasma-sprayed coatings and a nickel-based superalloy substrate, Int. J. Miner. Metall. Mater., 24(2017), No. 6, pp. 681-690. https://doi.org/10.1007/s12613-017-1451-0
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研究论文

Studies on thermally grown oxide as an interface between plasma-sprayed coatings and a nickel-based superalloy substrate

  • Department of Mechanical Engineering, Centre for Surface Engineering, Kalasalingam University, Krishnankoil 626126, Tamil Nadu, India

  • Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirapalli 620015, Tamil Nadu, India

  • Centre of Excellence in Corrosion and Surface Engineering (CECASE), National Institute of Technology, Tiruchirapalli 620015, Tamil Nadu, India

  • 通讯作者:

    Adam Khan Mahaboob Basha    E-mail: adamkhanm@gmail.com

  • A thermally grown oxide layer formed by hot corrosion was investigated as an interface between plasma-sprayed coatings and a nickel-based superalloy substrate. The hot corrosion mechanism of NiCr-Cr2O3 and Al2O3-40wt% TiO2 (A40T) plasma coated Inconel 617 was evaluated. The experiments were carried out at 1000℃ using a combination of Na2SO4, NaCl, and 2O5 salts to simulate the conditions of a gas turbine in a marine environment. The hot corrosion results revealed the spallation and dissolution of oxides upon prolonged exposure. Optical images and scanning electron micrographs of the exposed samples revealed the formation of oxide scale and provided details of its morphology in NiCr-Cr2O3 coated samples. Microstructure characterization of A40T coatings demonstrated a thermally grown oxide (TGO) layer at 1000℃. Increasing the thickness of the TGO layer decreased the corrosion resistance. The elemental analysis and image mapping revealed the migration of active elements from the substrate and coatings toward the corrosive environment.
    • Research Article

    Studies on thermally grown oxide as an interface between plasma-sprayed coatings and a nickel-based superalloy substrate

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      Abstract
    • A thermally grown oxide layer formed by hot corrosion was investigated as an interface between plasma-sprayed coatings and a nickel-based superalloy substrate. The hot corrosion mechanism of NiCr-Cr2O3 and Al2O3-40wt% TiO2 (A40T) plasma coated Inconel 617 was evaluated. The experiments were carried out at 1000℃ using a combination of Na2SO4, NaCl, and 2O5 salts to simulate the conditions of a gas turbine in a marine environment. The hot corrosion results revealed the spallation and dissolution of oxides upon prolonged exposure. Optical images and scanning electron micrographs of the exposed samples revealed the formation of oxide scale and provided details of its morphology in NiCr-Cr2O3 coated samples. Microstructure characterization of A40T coatings demonstrated a thermally grown oxide (TGO) layer at 1000℃. Increasing the thickness of the TGO layer decreased the corrosion resistance. The elemental analysis and image mapping revealed the migration of active elements from the substrate and coatings toward the corrosive environment.
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