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<p>This study aims to investigate the effect of Y₂O₃ addition on the microstructure, hardness, and corrosion resistance of in-situ NbC reinforced Ni-based coatings prepared by laser cladding. The results have shown that the addition of 1.0&#xa0;wt.% Y₂O₃ has refined the grains, improved phase uniformity, and increased the coating hardness to 825.12 HV₀.₂, which is 27.1% higher than the coating without Y₂O₃. Electrochemical tests revealed that the corrosion current density has decreased to 2.431 × 10<sup>−7</sup> A&#xa0;cm<sup>−2</sup> at 1.0&#xa0;wt.% Y₂O₃, indicating significantly enhanced corrosion resistance. Excessive Y₂O₃ (&gt; 1.0&#xa0;wt.%) has led to particle agglomeration, grain coarsening, and a reduction in both hardness and corrosion resistance. These findings demonstrate that optimal Y₂O₃ addition can effectively enhance the performance of NbC/Ni-based composite coatings, with potential to extend the service life of components in corrosive environments.</p>

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Effect of Y₂O₃ on microstructure and properties of NbC/Ni-based coating by laser cladding

  • 期刊论文

  • 发表日期：

    2025年9月18日

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  • Chaoyue Wei,
  • Wenqian Zhou,
  • Xueshan Du,
  • Kao Shi,
  • Wenbo Cao,
  • Jingyu Zhao,
  • Yufu Sun

摘要

This study aims to investigate the effect of Y₂O₃ addition on the microstructure, hardness, and corrosion resistance of in-situ NbC reinforced Ni-based coatings prepared by laser cladding. The results have shown that the addition of 1.0 wt.% Y₂O₃ has refined the grains, improved phase uniformity, and increased the coating hardness to 825.12 HV₀.₂, which is 27.1% higher than the coating without Y₂O₃. Electrochemical tests revealed that the corrosion current density has decreased to 2.431 × 10−7 A cm−2 at 1.0 wt.% Y₂O₃, indicating significantly enhanced corrosion resistance. Excessive Y₂O₃ (> 1.0 wt.%) has led to particle agglomeration, grain coarsening, and a reduction in both hardness and corrosion resistance. These findings demonstrate that optimal Y₂O₃ addition can effectively enhance the performance of NbC/Ni-based composite coatings, with potential to extend the service life of components in corrosive environments.