【摘要】 采用镁合金AZ31作为研究对象,成功利用仿生法分别在24,48 h内在AZ31表面形成一次、二次羟基磷灰石涂层,随时间增加,涂层厚度增加.利用X射线衍射和扫描电子显微镜对涂层进行表征并对形成涂层的试样进行耐蚀性实验研究.结果表明,二次涂层试样表面的HA涂层比一次涂层试样在基体表面分布均匀致密,二次涂层试样的降解速率比一次涂层试样明显降低,通过控制涂层形貌、厚度可在一定程度上控制基体镁合金AZ31的降解速率.更多还原

【Abstract】 A well-grown once and twice hydroxyapatite coatings on the surface of AZ31 magnesium alloy were produced in 24 and 48 h using a biomimetic technique.The coatings formed on the magnesium alloy were characterized by XRD,and the morphology of sample surfaces was observed by SEM.The samples were subsequently immersed in the simulated body fluid(SBF) for the degradation test.The results indicated that the degradation rate of the two-layer coating samples is slower than the single coating samples,the twice coatings are better than once coating,and it confirms the feasibility to control degradation rate of magnesium alloy by changing the morphology and thickness of coatings.更多还原