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<p>Magnesium alloys, as the lightest structural metals in practical applications, are widely used in automobiles, aircraft, ships, warships, and high-end military fields. However, their wear resistance and corrosion resistance are inadequate. High-velocity oxygen-fuel (HVOF) is an effective method for preparing high-temperature and wear-resistant coatings on magnesium alloy surfaces, which can significantly improve the protective performance of the surface of magnesium alloy parts. This enables magnesium alloys to achieve a synergistic optimization effect of lightweighting and corrosion resistance, and this technology can greatly promote the popularization and application of magnesium alloys in high-end manufacturing. HVOF spraying nano-WC particles will trigger the "pinning" effect in the sputtering deposition process, generating a dense nanocoating far superior to that of micron-coating spraying. It can significantly enhance the strengthening effect and coating quality of magnesium alloys and effectively prolong the service life. Currently, the mechanism of HVOF spraying nano-WC particles is not clear, and there is a lack of theoretical support for obtaining optimized processes. This study established a full-cycle model of HVOF spraying nano-WC particles on AZ31B magnesium alloys, covering the combustion reaction, dynamic flame jet spraying, multiphase flow of nanoparticles, and the particle impact process. The results show that the influence of nanoparticles on the temperature and velocity of the spraying flame is not obvious, similar to that of microparticle spraying. Compared with microparticle spraying, the particle flight characteristics (temperature and velocity) calculated based on the dispersed phase are significantly different. Nanoparticles lose temperature and velocity rapidly after leaving the nozzle, and appropriate adjustment of the spraying distance can improve the impact effect between nanoparticles and the substrate. This research provides an important theoretical basis for quantitatively revealing the behavior of nano-WC particle HVOF spraying and provides innovative ideas for effectively achieving the optimized process.</p>

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Research on Full-Cycle Modeling of High-velocity Oxygen-Fuel Spraying Nano-WC on AZ31B Magnesium Alloy

  • 期刊论文

  • 发表日期：

    2026年4月9日

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  • Xuan Wang,
  • Chang Li,
  • Jiayi Wang,
  • Chuanbin Ma,
  • Xing Han

摘要

Magnesium alloys, as the lightest structural metals in practical applications, are widely used in automobiles, aircraft, ships, warships, and high-end military fields. However, their wear resistance and corrosion resistance are inadequate. High-velocity oxygen-fuel (HVOF) is an effective method for preparing high-temperature and wear-resistant coatings on magnesium alloy surfaces, which can significantly improve the protective performance of the surface of magnesium alloy parts. This enables magnesium alloys to achieve a synergistic optimization effect of lightweighting and corrosion resistance, and this technology can greatly promote the popularization and application of magnesium alloys in high-end manufacturing. HVOF spraying nano-WC particles will trigger the "pinning" effect in the sputtering deposition process, generating a dense nanocoating far superior to that of micron-coating spraying. It can significantly enhance the strengthening effect and coating quality of magnesium alloys and effectively prolong the service life. Currently, the mechanism of HVOF spraying nano-WC particles is not clear, and there is a lack of theoretical support for obtaining optimized processes. This study established a full-cycle model of HVOF spraying nano-WC particles on AZ31B magnesium alloys, covering the combustion reaction, dynamic flame jet spraying, multiphase flow of nanoparticles, and the particle impact process. The results show that the influence of nanoparticles on the temperature and velocity of the spraying flame is not obvious, similar to that of microparticle spraying. Compared with microparticle spraying, the particle flight characteristics (temperature and velocity) calculated based on the dispersed phase are significantly different. Nanoparticles lose temperature and velocity rapidly after leaving the nozzle, and appropriate adjustment of the spraying distance can improve the impact effect between nanoparticles and the substrate. This research provides an important theoretical basis for quantitatively revealing the behavior of nano-WC particle HVOF spraying and provides innovative ideas for effectively achieving the optimized process.