Scholarlink

<p>To explore the wide application of AM60B magnesium alloy in the automobile field, micro-arc oxidation (MAO) coating and nano-SiC/MAO composite coating were prepared on the surface of AM60B. This study investigated the corrosion rule and predicted the failure time of both coatings by combining micro-area scanning electrochemical technology with numerical simulation. The results indicate that nano-SiC particles can significantly reduce the micropore size and porosity of the MAO coating, so that the corrosion rate of micropores on the surface of SiC/MAO composite coating is slower than that of the MAO coating. With the extension of corrosion time, the micropores on the coating surface preferentially undergo transverse corrosion expansion rather than longitudinal substrate corrosion, and finally form the failure phenomenon of adjacent micropore penetration. The numerical simulation results show that in 3.5 wt.% NaCl solution, the MAO coating undergoes corrosion failure after 320&#xa0;days of immersion, while the failure time of the SiC/MAO composite coating can be extended to 720&#xa0;days. Based on this, the microporous corrosion mechanism model of SiC/MAO composite coating was proposed in this study, which provided an important reference for the corrosion resistance application of magnesium alloy.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Numerical Simulation Study on Corrosion Resistance of Nano-SiC/Micro-arc Oxidized Composite Coating on Magnesium Alloy Surface

  • 期刊论文

  • 发表日期：

    2025年11月10日

查看全文
  • Jie Zhao,
  • Ran Lv,
  • Xiaoyu Yang,
  • Donglei Yan,
  • Ting Dai,
  • Jialong Wang,
  • Guangxu Xu

摘要

To explore the wide application of AM60B magnesium alloy in the automobile field, micro-arc oxidation (MAO) coating and nano-SiC/MAO composite coating were prepared on the surface of AM60B. This study investigated the corrosion rule and predicted the failure time of both coatings by combining micro-area scanning electrochemical technology with numerical simulation. The results indicate that nano-SiC particles can significantly reduce the micropore size and porosity of the MAO coating, so that the corrosion rate of micropores on the surface of SiC/MAO composite coating is slower than that of the MAO coating. With the extension of corrosion time, the micropores on the coating surface preferentially undergo transverse corrosion expansion rather than longitudinal substrate corrosion, and finally form the failure phenomenon of adjacent micropore penetration. The numerical simulation results show that in 3.5 wt.% NaCl solution, the MAO coating undergoes corrosion failure after 320 days of immersion, while the failure time of the SiC/MAO composite coating can be extended to 720 days. Based on this, the microporous corrosion mechanism model of SiC/MAO composite coating was proposed in this study, which provided an important reference for the corrosion resistance application of magnesium alloy.