目的 探究微弧氧化电解液中纳米 α-Al₂O₃ 的浓度对铝合金微弧氧化膜层组织和性能的影响。方法 在硅酸盐体系电解液中加入 15 g / L 纳米 α-Al₂O₃,微弧氧化获得不同的陶瓷膜层,对膜层的微观结构、厚度、硬度和耐腐蚀性能进行分析。 结果 膜层的主要组成相为 α-Al₂O₃、γ-Al₂O₃ 和 SiO₂。 当纳米α-Al₂O₃ 添加量为 3 g / L 时,膜层表面微裂纹少,孔隙率小,厚度达 70 μm,硬度为 513 HV,耐腐蚀性能好。结论 硅酸盐电解液中加入纳米 α-Al₂O₃,能够改善铝合金微弧氧化膜层的综合性能。

Objective To explore the effects of α-Al₂O₃ content on the microstructure and mechanical properties of the coating formed on aluminum alloy by the method of micro-arc oxidation with α-Al₂O₃ addition in electrolyte system. Methods Different ceramic coatings were obtained by adding 1 ~ 5 g / L nanoα-Al₂O₃ additive into the silicate system solution and the micro-structure, thickness, hardness and corrosion resistance were analyzed. Results The main phases of the coating were α-Al₂O₃ , γ-Al₂O₃ and SiO₂ . There were few micro-cracks and small porosity of the coating when the content of nano α-Al₂O₃ was 3 g / L, and the thickness reached 70 μm, the hardness was 513 HV and the corrosion resistance of the coating was good. Conclusion Addition of α-Al₂O₃ into the silicate electrolyte system could improve the comprehensive performances of the micro-arc oxidation coating on alu