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<p>Electroless nickel–phosphorus (NiP) coatings are recognized for their uniformity, corrosion resistance, and tribological performance. In the present work, NiP composite coatings reinforced with molybdenum disulfide (MoS<sub>2</sub>) and graphite were developed on EN8 steel by the electroless deposition technique and annealed at 400&#xa0;°C. The coatings were systematically characterized using SEM/EDS, XRD, surface profilometry, water contact angle measurements, nanoindentation, scratch adhesion testing, potentiodynamic polarization, and electrochemical impedance spectroscopy. The SEM cross-sectional studies confirmed uniform coatings with thicknesses in the range of 26-31&#xa0;<i>µ</i>m. Compared with single-reinforced coatings, the hybrid NiP–MoS<sub>2</sub>–Gr coating demonstrated higher hardness (2653.7&#xa0;MPa), improved adhesion, and superior scratch resistance with the lowest penetration depth of 18.85&#xa0;<i>µ</i>m. Electrochemical measurements revealed that the coatings significantly improved corrosion resistance compared with bare steel, with the hybrid coating exhibiting a corrosion rate of 0.232&#xa0;mm&#xa0;year⁻<sup>1</sup> and an i<sub>corr</sub> of 2.85 × 10⁻<sup>5</sup>&#xa0;A cm⁻<sup>2</sup>. Wettability analysis showed an increased contact angle of 79°, indicating reduced surface wettability compared with the other coatings. The results highlight the synergistic role of solid lubricants in improving multifunctional properties, making the hybrid coating a promising candidate for high-performance engineering applications.</p>

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Electroless NiP Hybrid Composite Coatings with MoS2 and Graphite: Synergistic Enhancement of Mechanical and Electrochemical Properties

  • 期刊论文

  • 发表日期：

    2026年5月23日

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  • M. Karthikeyan,
  • A. Elayaperumal,
  • C. Balamurugan

摘要

Electroless nickel–phosphorus (NiP) coatings are recognized for their uniformity, corrosion resistance, and tribological performance. In the present work, NiP composite coatings reinforced with molybdenum disulfide (MoS2) and graphite were developed on EN8 steel by the electroless deposition technique and annealed at 400 °C. The coatings were systematically characterized using SEM/EDS, XRD, surface profilometry, water contact angle measurements, nanoindentation, scratch adhesion testing, potentiodynamic polarization, and electrochemical impedance spectroscopy. The SEM cross-sectional studies confirmed uniform coatings with thicknesses in the range of 26-31 µm. Compared with single-reinforced coatings, the hybrid NiP–MoS2–Gr coating demonstrated higher hardness (2653.7 MPa), improved adhesion, and superior scratch resistance with the lowest penetration depth of 18.85 µm. Electrochemical measurements revealed that the coatings significantly improved corrosion resistance compared with bare steel, with the hybrid coating exhibiting a corrosion rate of 0.232 mm year⁻1 and an icorr of 2.85 × 10⁻5 A cm⁻2. Wettability analysis showed an increased contact angle of 79°, indicating reduced surface wettability compared with the other coatings. The results highlight the synergistic role of solid lubricants in improving multifunctional properties, making the hybrid coating a promising candidate for high-performance engineering applications.