纳米 Al ₂O ₃ 颗粒对 MB8 镁合金微弧氧化膜层耐蚀性的影响

Effect of the incorporation of nano-Al ₂O ₃ particles on corrosion resistance of micro-arc oxidation coating on MB8 magnesium alloy

摘要

[目的] 为解决 MB8 镁合金微弧氧化(MAO)膜层孔隙率高、耐蚀性不足的问题，探究纳米 Al ₂O ₃ 颗粒对膜层组织与性能的调控机制。[方法] 在硅酸盐基电解液中添加不超过 12 g/L 的纳米 Al ₂O ₃ 颗粒，采用恒流模式制备 MAO 膜层，通过扫描电镜(SEM)和 X 射线衍射(XRD)表征膜层的微观形貌与相组成，结合表面粗糙度仪测试形貌参数，借助极化曲线和电化学阻抗谱(EIS)评价耐蚀性，并根据电压−时间曲线分析MAO过程的放电行为。[结果] 膜层物相主要由MgO、MgSiO ₃和Mg ₂SiO ₄ 组成，未受纳米 Al ₂O ₃ 颗粒的影响。随着纳米 Al ₂O ₃ 颗粒添加量的增大，MAO 膜层厚度和表面粗糙度整体呈上升趋势，腐蚀电位正移，腐蚀电流密度减小。当纳米 Al ₂O ₃ 颗粒的质量浓度为 8 g/L 时，膜层的耐蚀性最优，体现在低频阻抗模值最高，腐蚀电流密度最小，极化电阻最大。[结论] 纳米 Al ₂O ₃ 颗粒对 MB8 镁合金微弧氧化膜的性能有显著影响，实际生产中应按需优化电参数组合，以获得理想的膜层性能。

Abstract

[Objective] To address the problems of high porosity and insufficient corrosion resistance of micro-arc oxidation (MAO) coatings on MB8 magnesium alloy, the regulation mechanism of nano-Al ₂O ₃ particles on the microstructure and properties of the coatings was studied. [Method] Nano-Al ₂O ₃ particles at mass concentrations up to 12 g/L were added to a silicate-based electrolyte, and MAO coatings were prepared under a constant current mode. The microstructure and phase composition of the coatings were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Surface roughness ( Ra) was measured using a surface profilometer. Corrosion resistance was evaluated via potentiodynamic polarization curve measurement and electrochemical impedance spectroscopy (EIS), and the discharge behavior during MAO process was analyzed based on the voltage vs. time curves. [Result] The coatings were mainly composed of MgO, MgSiO ₃, and Mg ₂SiO ₄, with no effect from the addition of nano-Al ₂O ₃ particles. With the increasing of the mass concentration of nano-Al ₂O ₃ particles, the thickness and surface roughness of the MAO coatings generally increased, the corrosion potential shifted positively, and the corrosion current density decreased. When the mass concentration of nano-Al ₂O ₃ particles was 8 g/L, the coating exhibited the optimal corrosion resistance, characterized by the highest low-frequency impedance modulus, the lowest corrosion current density, and the largest polarization resistance. [Conclusion] Nano-Al ₂O ₃ particles significantly affect the properties of MAO coatings on MB8 magnesium alloy. In practical production, the combination of electrolysis parameters should be optimized according to specific requirements to achieve desired coating performance.

关键词

含锰变形镁合金 / 微弧氧化 / 纳米氧化铝颗粒 / 微观结构 / 耐蚀性

Key words

manganese-containing wrought magnesium alloy / micro-arc oxidation / alumina nanoparticle / microstructure / corrosion resistance

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基金资助

广东科技学院校基金项目(GKY-2025BSQDK-8)

广东科技学院校级科研项目(GKY-2025KYYBK-2)