为改善医用AZ31镁合金的抗蚀性能,综合应用阳极氧化及化学转化工艺在其表面制备了复合膜层.通过扫描电镜观察了膜层形貌,X射线衍射分析了膜层成分,并利用电化学测试手段对膜层性能进行了表征.结果表明,阳极氧化工艺制备的膜层粗糙不平,主要组成为Mg(OH)_2及Al_2O_3;经化学转化后,所得复合膜较为致密、平整,膜层中主要含元素N,O,P.动电位极化曲线分析表明,复合膜对AZ31镁合金具有显著的保护作用.EIS阻抗图谱拟合电路反映出制备的复合膜层具有4层结构,从侧面证明了阳极氧化膜与化学转化膜之间的化学结合作用.
In order to improve corrosion resistance of AZ31 magnesium alloy for biomedical application, a composite coating was prepared on AZ31 with the combination of applications of anodic oxidation and chemical conversion technology. The morphology of the coating was observed by SEM and its phases was analyzed by XRD while its property was characterized by electrochemical testing instrument. It is showed that the first coating prepared by anodic oxidation is rough and uneven observed, composed mainly by Mg(OH)_2 and Al_2O_3; After chemical conversion, the final composite coating is dense and even, showing proper contents of N, O, P. The potentiodynamic polarization curve demonstrates that the composite coating reduced corrosive rate of AZ31 magnesium alloy evidently. And the simulated circuit of the electrochemical impedance spectroscopy reveals the four-layer structure of the prepared composite coating, proving indirectly the chemical bonding between the anodic oxidized coating and the chemical conversion coating.
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