Na_2SiO_3浓度对复合阳极氧化膜性能的影响

Influence of Na_2SiO_3 Concentration on the Properties of Composite Anodic Oxide Films

阳极氧化电解液组分是影响氧化膜质量和性能的重要因素。在AZ31镁合金表面采用阳极氧化的方法制备了第二相粒子强化的氧化膜,探讨了电解液中的成膜剂Na_2SiO_3浓度对复合阳极氧化膜形貌及耐蚀性的影响。采用扫描电镜观察了复合阳极氧化膜的表面形貌;利用X射线衍射分析了氧化膜的相组成;采用电化学测试的方法评价了复合阳极氧化膜的耐蚀性。结果表明:成膜剂Na_2SiO_3浓度对复合阳极氧化膜的成膜电压、表面形貌及耐蚀性均有较大影响,但对其相组成影响不明显;当成膜剂Na_2SiO_3浓度为120 g/L时,阳极氧化膜表面连续、致密,表面微孔细小、圆整且分布均匀,具有最佳的耐蚀性。

The component of anodic oxidation electrolyte is an important factor that affects the quality and performance of the oxide film. Composite oxide films containing superfine SiC particles were prepared on AZ31 magnesium alloy by anodizing. The influence of film former Na2 SiO3 concentrationon the corrosion resistance and wear resistance of composite anodic oxide films were studied. The surface morphology of the composite anodic oxide film was observed by scanning electron microscopy. The phase composition of the oxide film was analyzed by X-ray diffraction. The corrosion and wear resistance of the composite anodized film was evaluated by electrochemical test and friction and wear test. The results show that Na2SiO3 concentration has a great influence on the film formation voltage, surface morphology, corrosion resistance and abrasion resistance of the composite anodic oxide film, but has no obvious influence on the phase composition. When the Na2SiOz concentration was 120 g/L, the surface of the anodic oxide film was continuous and dense, and the micropores of the surface were fine and uniform with the best corrosion resistance and wear resistance.