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采用阳极氧化方法在AZ31镁合金表面制备了一种新的包含Al2O3纳米颗粒的复合阳极氧化膜,研究了添加剂乙二胺四乙酸(EDTA)对复合阳极氧化的影响。采用扫描电镜观察了复合阳极氧化膜的表面形貌及磨痕的形貌;利用涡流测厚仪测试了复合阳极氧化膜的厚度;采用极化曲线和往复摩擦磨损试验评价了复合阳极氧化膜的耐蚀性和耐磨性。结果表明,有机添加剂EDTA对阳极氧化的成膜电压、氧化膜表面形貌、厚度及其耐蚀性能均有较大影响。当EDTA浓度为0.03 mol/L时,复合阳极氧化膜表面连续致密,孔洞细小且分布均匀,耐蚀性能相对较优,且具备优异的耐磨性能。
A new composite anodic oxide film containing Al2O3 nanoparticles was prepared on the surface of AZ31 magnesium alloy by anodic oxidation. The effect of the additive EDTA on the anodic oxidation was studied. The surface morphology and wear morphology of the composite anodic oxide film were observed by scanning electron microscopy. The thickness of the composite anodic oxide film was measured by eddy current thickness gauge. The polarization curve and reciprocating friction and wear test were used to evaluate the composite anodic oxide film Corrosion and wear resistance. The results showed that the organic additive EDTA had a great influence on the film formation voltage, surface morphology, thickness and corrosion resistance of anodized film. When the concentration of EDTA is 0.03 mol / L, the surface of the composite anodic oxide film is continuous and compact, the pores are small and evenly distributed, the corrosion resistance is relatively superior and the wear resistance is excellent.