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<p>Magnesium-lithium (Mg-Li) alloys have relatively excellent mechanical properties; however, its poor corrosion resistance limits the application. In order to improve the poor corrosion resistance of Mg-Li alloys, we investigated&#xa0;the effect of chitosan/Ce-V conversion film composite coatings on the corrosion resistance of Mg-8.5Li-6.5Zn-1.2Y alloy. By comparing the Ce-V conversion films with and without modification of potassium permanganate (KMnO<sub>4</sub>), it can be found that the bonding between the coating and the substrate is significantly improved, and the thickness of the coating increases from 4.4 to 21.6&#xa0;µm. KMnO<sub>4</sub> is involved in the formation reaction of Ce-V conversion film. The chitosan coating was then prepared on the Ce-V conversion film. Results show that the variation of the solution pH during the preparation process has a significant effect on the denseness and corrosion resistance of the film. When the solution pH is 6.5, the chitosan/Ce-V conversion film composite coating has the best densification and corrosion resistance.</p>

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Modulation the Properties of Chitosan/Ce-V Conversion Film Composite Coating on Mg-8.5Li-6.5Zn-1.2Y by KMnO4 and pH

  • 期刊论文

  • 发表日期：

    2025年6月11日

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  • Chen Xu,
  • Song Shen,
  • Jia-xiu Wang,
  • Rui-zhi Wu,
  • Le-gan Hou,
  • Jing-huai Zhang

摘要

Magnesium-lithium (Mg-Li) alloys have relatively excellent mechanical properties; however, its poor corrosion resistance limits the application. In order to improve the poor corrosion resistance of Mg-Li alloys, we investigated the effect of chitosan/Ce-V conversion film composite coatings on the corrosion resistance of Mg-8.5Li-6.5Zn-1.2Y alloy. By comparing the Ce-V conversion films with and without modification of potassium permanganate (KMnO4), it can be found that the bonding between the coating and the substrate is significantly improved, and the thickness of the coating increases from 4.4 to 21.6 µm. KMnO4 is involved in the formation reaction of Ce-V conversion film. The chitosan coating was then prepared on the Ce-V conversion film. Results show that the variation of the solution pH during the preparation process has a significant effect on the denseness and corrosion resistance of the film. When the solution pH is 6.5, the chitosan/Ce-V conversion film composite coating has the best densification and corrosion resistance.