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<p>Ni-P/Ni-Mo bilayer coatings were fabricated via pulsed electrodeposition, and the impact of heat treatment (200–600&#xa0;°C) on their microstructure, mechanical, tribological, and corrosion-resistant properties was systematically investigated. Comprehensive characterization techniques revealed temperature-dependent phase evolution and performance enhancement mechanisms. At 400&#xa0;°C, the outer Ni-Mo layer formed MoNi intermetallic compounds, while the inner Ni-P layer precipitated Ni<sub>2</sub>P phases, synergistically achieving peak hardness (1179 HV) and minimal wear rate (2.1 × 10<sup>−4</sup> mm<sup>3</sup>/N·m). In contrast, heat treatment at 500&#xa0;°C optimized corrosion resistance, with polarization resistance increasing to 865 kΩ·cm<sup>2</sup> and corrosion current density decreasing to 2.85 × 10<sup>−7</sup> A/cm<sup>2</sup>. The improved corrosion resistance was attributed to interlayer defect mismatch redirecting corrosion paths from longitudinal to transverse, coupled with intermetallic precipitation blocking corrosive substance penetration. This study establishes a temperature-dependent structure–property relationship for Ni-P/Ni-Mo coatings, demonstrating their potential as durable protective materials in harsh environments.</p>

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Effect of Heat Treatment on the Properties of Pulsed Electrodeposited Ni-P/Ni-Mo Bilayer Coatings

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Jiachen Liu,
  • Changhao Qi,
  • Yi Luo,
  • Zekun Gao,
  • Yuting Zhang,
  • Jiyang Ying,
  • Yiku Xu,
  • Qinyang Zhao,
  • Yongnan Chen,
  • Qinqin Li,
  • Wenzhong Luo

摘要

Ni-P/Ni-Mo bilayer coatings were fabricated via pulsed electrodeposition, and the impact of heat treatment (200–600 °C) on their microstructure, mechanical, tribological, and corrosion-resistant properties was systematically investigated. Comprehensive characterization techniques revealed temperature-dependent phase evolution and performance enhancement mechanisms. At 400 °C, the outer Ni-Mo layer formed MoNi intermetallic compounds, while the inner Ni-P layer precipitated Ni2P phases, synergistically achieving peak hardness (1179 HV) and minimal wear rate (2.1 × 10−4 mm3/N·m). In contrast, heat treatment at 500 °C optimized corrosion resistance, with polarization resistance increasing to 865 kΩ·cm2 and corrosion current density decreasing to 2.85 × 10−7 A/cm2. The improved corrosion resistance was attributed to interlayer defect mismatch redirecting corrosion paths from longitudinal to transverse, coupled with intermetallic precipitation blocking corrosive substance penetration. This study establishes a temperature-dependent structure–property relationship for Ni-P/Ni-Mo coatings, demonstrating their potential as durable protective materials in harsh environments.