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Volume 27 Issue 5
May  2020

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Kuzhipadath Jitheshand Moganraj Arivarasu, Comparative studies on the hot corrosion behavior of air plasma spray and high velocity oxygen fuel coated Co-based L605 superalloys in a gas turbine environment, Int. J. Miner. Metall. Mater., 27(2020), No. 5, pp. 649-659. https://doi.org/10.1007/s12613-019-1943-1
Cite this article as:
Kuzhipadath Jitheshand Moganraj Arivarasu, Comparative studies on the hot corrosion behavior of air plasma spray and high velocity oxygen fuel coated Co-based L605 superalloys in a gas turbine environment, Int. J. Miner. Metall. Mater., 27(2020), No. 5, pp. 649-659. https://doi.org/10.1007/s12613-019-1943-1
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研究论文

燃气轮机环境下空气等离子喷涂与高速氧燃料涂层Co基L605高温合金热腐蚀行为的对比研究

  • Research Article

    Comparative studies on the hot corrosion behavior of air plasma spray and high velocity oxygen fuel coated Co-based L605 superalloys in a gas turbine environment

    + Author Affiliations
    • An improvement in the corrosion resistance of alloys at elevated temperature is a factor for their potential use in gas turbines. In this study, CoNiCrAlY has been coated on the L605 alloy using air plasma spray (APS) and high-velocity oxygen fuel (HVOF) coating techniques to enhance its corrosion resistance. Hot corrosion studies were conducted on uncoated and coated samples in a molten salt environment at 850°C under cyclic conditions. Thermogravimetric analysis was used to determine the corrosion kinetics. The samples were subjected to scanning electron microscopy, energy-dispersive spectroscopy, and X-ray diffraction for further investigation. In coated samples, the formation of Al2O3 and Cr2O3 in the coating acts as a diffusion barrier that could resists the inward movement of the corrosive species present in the molten salt. Coated samples showed very less spallation, lower weight gain, less porosity, and internal oxidation as compared to uncoated sample. HVOF-coated sample showed greater corrosion resistance and inferred that this is the best technique under these conditions.

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