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<p>The extreme reactivity of magnesium–lithium alloys results in poor corrosion resistance, severely limiting their engineering applications. This study developed a novel micro-arc oxidation–silane/8-hydroxyquinoline (MAO-QS) composite coating system. Electrochemical testing demonstrated that the MAO-QS coating exhibits an order-of-magnitude improvement in corrosion resistance compared to the substrate, micro-arc oxidation (MAO) coating, and silane sealing alone (MAO-S) coating. This superior performance stems from the synergistic effect of the physical barrier provided by the silane layer and the chemical corrosion inhibition of 8-HQ, which actively passivates corrosion defects and significantly delays corrosion propagation. This study offers an innovative and promising surface engineering solution for the efficient and long-term protection of magnesium-lithium alloys.</p>

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Effects of 8-HQ Synergistic Modification Micro-Arc Oxidation-Silane Composite Coating on the Corrosion Resistance of LA141 Alloy

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Defen Zhang,
  • Xin Yan,
  • Wanlin Xie,
  • Yukun Wang,
  • Xiongxiong Tian,
  • Xiaowen Chen

摘要

The extreme reactivity of magnesium–lithium alloys results in poor corrosion resistance, severely limiting their engineering applications. This study developed a novel micro-arc oxidation–silane/8-hydroxyquinoline (MAO-QS) composite coating system. Electrochemical testing demonstrated that the MAO-QS coating exhibits an order-of-magnitude improvement in corrosion resistance compared to the substrate, micro-arc oxidation (MAO) coating, and silane sealing alone (MAO-S) coating. This superior performance stems from the synergistic effect of the physical barrier provided by the silane layer and the chemical corrosion inhibition of 8-HQ, which actively passivates corrosion defects and significantly delays corrosion propagation. This study offers an innovative and promising surface engineering solution for the efficient and long-term protection of magnesium-lithium alloys.