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[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_2O3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_2O3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、MgSiO3和Mg_2SiO4组成，未受纳米Al_2O3颗粒的影响。随着纳米Al_2O3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_2O3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_2O3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_2O3 particles on the microstructure and properties of the coatings was studied. [Method] Nano-Al_2O3 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, MgSiO3, and Mg_2SiO4, with no effect from the addition of nano-Al_2O3 particles. With the increasing of the mass concentration of nano-Al_2O3 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_2O3 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_2O3 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.
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基本信息:
DOI：10.19289/j.1004-227x.2026.05.009
中图分类号:TG174.4
引用信息:
[1]李坤,黎颖怡,姜炳春,等.纳米Al_2O_3颗粒对MB8镁合金微弧氧化膜层耐蚀性的影响[J].电镀与涂饰,2026,45(05):70-79.DOI:10.19289/j.1004-227x.2026.05.009.
基金信息:
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)
2026-03-17
2026-03-17
2026-03-17