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<p>In this study, WC-10Co-4Cr and La<sub>2</sub>O<sub>3</sub>-doped WC-10Co-4Cr coatings were deposited on SS410 stainless steel using the High-Pressure High-Velocity Oxy-Fuel (HP-HVOF) technique to improve cavitation and corrosion resistance. The coatings were characterized using SEM, EDS mapping, and XRD, which confirmed uniform elemental distribution and low porosity. The mechanical properties, including hardness, adhesion strength, and coating density, were observed to be significantly enhanced with La<sub>2</sub>O<sub>3</sub> addition due to refined microstructure and reduced inter-splat voids. Cavitation erosion tests revealed that the La₂O₃-doped coating exhibited the lowest mass loss compared to the undoped and uncoated samples, owing to its higher hardness and crack resistance. The erosion signatures, such as flaky craters and fine microcracks, indicated improved toughness and energy absorption capability. The Artificial Neural Network (ANN) model was employed to predict mass loss behavior under varying jet velocity, impingement angle, and stand-off distance. The model demonstrated excellent agreement with experimental data, confirming its reliability in estimating cavitation erosion response. Corrosion tests further verified the superior chemical stability of the La<sub>2</sub>O<sub>3</sub>-doped coating in saline environments. Overall, the combined effects of La₂O₃ doping and HP-HVOF processing significantly enhanced the coating’s mechanical integrity, erosion resistance, and corrosion performance, making them suitable for high-demand hydrodynamic applications.</p>

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Surface investigation on cavitation-erosion resistance of WC-10Co-4Cr and La2O3 doped coatings on SS410 through HP-HVOF technique

  • 期刊论文

  • 发表日期：

    2026年1月15日

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  • Vikrant Singh,
  • N. Jeyaprakash,
  • Mohit Vishnoi,
  • Syed Quadir Moinuddin,
  • Vijay Kumar,
  • Anuj Bansal

摘要

In this study, WC-10Co-4Cr and La2O3-doped WC-10Co-4Cr coatings were deposited on SS410 stainless steel using the High-Pressure High-Velocity Oxy-Fuel (HP-HVOF) technique to improve cavitation and corrosion resistance. The coatings were characterized using SEM, EDS mapping, and XRD, which confirmed uniform elemental distribution and low porosity. The mechanical properties, including hardness, adhesion strength, and coating density, were observed to be significantly enhanced with La2O3 addition due to refined microstructure and reduced inter-splat voids. Cavitation erosion tests revealed that the La₂O₃-doped coating exhibited the lowest mass loss compared to the undoped and uncoated samples, owing to its higher hardness and crack resistance. The erosion signatures, such as flaky craters and fine microcracks, indicated improved toughness and energy absorption capability. The Artificial Neural Network (ANN) model was employed to predict mass loss behavior under varying jet velocity, impingement angle, and stand-off distance. The model demonstrated excellent agreement with experimental data, confirming its reliability in estimating cavitation erosion response. Corrosion tests further verified the superior chemical stability of the La2O3-doped coating in saline environments. Overall, the combined effects of La₂O₃ doping and HP-HVOF processing significantly enhanced the coating’s mechanical integrity, erosion resistance, and corrosion performance, making them suitable for high-demand hydrodynamic applications.