Micro-arc oxidation (MAO) is an efficient approach to improve the hardness, wear resistance, and other properties of aluminum alloys. In order to investigate the effect of the electrolyte concentration on the properties of MAO coatings for LY12 alloy, the voltage variation during the MAO process was recorded. The surface morphologies and phase compositions of the coatings produced with different electrolytes were investigated using scanning electron microscopy and X-ray diffraction, respectively. The roughness and thickness of the coatings were measured using a pocket roughness meter and an eddy-current thickness meter, respectively. The tribological performances of the coatings were investigated against GCr15 bearing steel on a ball-on-disc wear tester in open air. The results showed that with an increase in the Na₂SiO₃ content, the working voltage of the MAO process decreased, the roughness and thickness of the coatings increased significantly, and the relative content of the α-Al₂O₃ phase decreased. With an increase in the KOH content, the working voltage decreased slightly, the roughness and thickness of the coatings increased slightly, and the α-and γ-Al₂O₃ phase contents remained unchanged. The friction coefficient and wear rate of the coatings increased with an increase in the Na₂SiO₃ and KOH concentrations. A decrease in the porosity and roughness and an increase in the α-Al₂O₃ content of the coatings reduced their wear mass loss.

微弧氧化（MAO）是提高铝合金硬度，耐磨性和其他性能的有效方法。为了研究电解质浓度对LY12合金MAO涂层性能的影响，记录了MAO过程中的电压变化。分别使用扫描电子显微镜和X射线衍射研究了用不同电解质生产的涂层的表面形貌和相组成。分别使用袋式粗糙度仪和涡流厚度仪测量涂层的粗糙度和厚度。在露天的圆盘式球磨机上研究了涂层对GCr15轴承钢的摩擦学性能。结果表明，随着Na ₂含量的增加的SiO ₃内容时，MAO处理的工作电压降低，涂层的粗糙度和厚度显著增加，并且所述α-Al的相对含量₂ ö ₃相减少。与增加的KOH含量，工作电压稍微降低，涂层的粗糙度和厚度略有增加，并且所述α-和在γ-Al ₂ ö ₃相内容保持不变。随着Na ₂ SiO ₃和KOH浓度的增加，涂层的摩擦系数和磨损率增加。在孔隙率和粗糙度和的增加的降低的α-Al ₂ ö ₃ 涂料的含量减少了它们的磨损质量损失。