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<p>To further improve the wear resistance and corrosion resistance of AZ91 magnesium alloy, the effect of polytetrafluoroethylene (PTFE) as an electrolyte additive on the construction of microarc oxidation (MAO) ceramic coatings on the surface of AZ91 magnesium alloy was studied. In this experiment, the microarc oxide ceramic coating was prepared in a constant current mode, with the morphology, chemical composition, corrosion resistance, and wear resistance of the coating being meticulously analyzed. The results indicate that the addition of PTFE in the electrolyte reduces the breakdown voltage coatings by affecting the conductivity of the electrolyte, which in turn significantly alters the thickness and surface characteristics of the coatings. In the composition of the coating structure, PTFE is only combined in an inert way in a small amount on the coating and does not participate in the composition of the coating. In addition, the ceramic coating obtained by adding PTFE particles has the best tribological properties and low corrosion rate when the deposition time is 10 minutes.</p>

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Effect of Polytetrafluoroethylene-Assisted Microarc Oxidation on Corrosion and Wear Characteristics of AZ91 Magnesium Alloy Surface Coating

  • 期刊论文

  • 发表日期：

    2025年2月24日

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  • Zhiquan Huang,
  • Shan Bai,
  • Yiqing Wang,
  • Jinchao Zou,
  • Xiangyu Gao,
  • Yun Lu,
  • Tao Zhang

摘要

To further improve the wear resistance and corrosion resistance of AZ91 magnesium alloy, the effect of polytetrafluoroethylene (PTFE) as an electrolyte additive on the construction of microarc oxidation (MAO) ceramic coatings on the surface of AZ91 magnesium alloy was studied. In this experiment, the microarc oxide ceramic coating was prepared in a constant current mode, with the morphology, chemical composition, corrosion resistance, and wear resistance of the coating being meticulously analyzed. The results indicate that the addition of PTFE in the electrolyte reduces the breakdown voltage coatings by affecting the conductivity of the electrolyte, which in turn significantly alters the thickness and surface characteristics of the coatings. In the composition of the coating structure, PTFE is only combined in an inert way in a small amount on the coating and does not participate in the composition of the coating. In addition, the ceramic coating obtained by adding PTFE particles has the best tribological properties and low corrosion rate when the deposition time is 10 minutes.