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<p>This study aims to investigate the effect of plasma-nitriding pretreatment on the microstructural and corrosion behaviour of WCrAlTiSiN multilayer coatings produced by multi-arc ion plating. Six systems were investigated as follows: (i) untreated 42CrMo low-alloy steel; (ii) low-temperature plasma nitriding (LPN); (iii) high-temperature plasma nitriding (HPN); (iv) only-coating deposited on the 42CrMo steel (C); (v) LPN + C; and (vi) HPN + C treatments. The electrochemical corrosion performance of the samples in 3.5 wt% NaCl solution was systematically investigated using an electrochemical workstation, and the corrosion mechanisms were discussed in detail. The influence of coating defects, such as droplets, and the different compound layers formed during pre-nitriding on corrosion behaviour was studied. The performance improvement of HPN + C samples is achieved through pre-nitriding treatment that forms a dense microstructure, creating an impermeable barrier for the top WCrAlTiSiN multilayer and significantly reducing the electrochemical active area at the interface, thereby ensuring the optimal synergistic effect between effective defect sealing and the protection mechanism.</p>

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Effect of nitrided compounds layer on the electrochemical behaviour of (W, Cr, Al, Ti, Si)N multielement nitrides coated on 42CrMo steel

  • 期刊论文

  • 发表日期：

    2026年3月16日

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  • J. H. Li,
  • Z. W. Wang,
  • Z. H. Zhang,
  • Z. W. Jiang,
  • X. N. Yi,
  • Y. Y. He,
  • Y. Li

摘要

This study aims to investigate the effect of plasma-nitriding pretreatment on the microstructural and corrosion behaviour of WCrAlTiSiN multilayer coatings produced by multi-arc ion plating. Six systems were investigated as follows: (i) untreated 42CrMo low-alloy steel; (ii) low-temperature plasma nitriding (LPN); (iii) high-temperature plasma nitriding (HPN); (iv) only-coating deposited on the 42CrMo steel (C); (v) LPN + C; and (vi) HPN + C treatments. The electrochemical corrosion performance of the samples in 3.5 wt% NaCl solution was systematically investigated using an electrochemical workstation, and the corrosion mechanisms were discussed in detail. The influence of coating defects, such as droplets, and the different compound layers formed during pre-nitriding on corrosion behaviour was studied. The performance improvement of HPN + C samples is achieved through pre-nitriding treatment that forms a dense microstructure, creating an impermeable barrier for the top WCrAlTiSiN multilayer and significantly reducing the electrochemical active area at the interface, thereby ensuring the optimal synergistic effect between effective defect sealing and the protection mechanism.