阳极氧化对AZ31镁合金表面粘接性能的影响

The Effects of Anodizing on Surface Adhesive Strength of AZ31 Magnesium Alloy

为了提高AZ31镁合金表面与有机涂料和胶粘剂的粘接强度,通过对镁合金表面进行阳极氧化处理的方法,利用正交试验对镁合金硅酸盐阳极氧化电解液配方和工艺进行了优化,研究了其对氧化膜粘接性能的影响。得出不同工艺参数对粘接强度的影响程度从小到大排列为:KF浓度<Na2B4O7浓度<KOH浓度<阳极氧化时间<电流密度。所得氧化膜的表面电位比基体提高了200mV,粘接强度提高了约50%。结果表明:氧化膜的表面形貌对粘接强度起决定性影响,表面成分则影响不大。

The effects of technological parameters on adhesive strength of anodic film on AZ31 magnesium alloy were studied through orthogonal experiments. The result shows that the influence degrees of the parameters on adhesive strength are as follows： KF 〈 Na2B4O7 〈 KOH 〈 time 〈 current density. The surface potential of the film is about 200 mV higher than the matrix, and the adhesive strength is raised by 50%. The adhesive strength of the anodic film is influenced mainly by the surface morphology of the film, not the surface contents.