摘要由于社会进步和科学技术发展，新型复合材料起到了越来越重要的作用。镁合金有较好的生物相容性和可降解性，在医学领域受到了广泛的研究，但是其可降解速度较快，不能满足服役要求。本研究在镁合金表面制备MAO-ED复合膜层，通过性能测试，并与微弧氧化膜层对比，分析复合膜层的组织和性能特点。86491

本文采用ZK60镁合金为研究对象，MAO电解液成分为6。0g/L Na2SiO3·9H2O + 0。5g/L Ca(CH3COO)2·H2O + 0。8g/L (NaPO3)6 + 0。5g/L NaH2PO4·H2O + 2。8g/L NaOH，采用恒流模式进行微弧氧化。将羟基磷灰石加入到无水乙醇当中配制分别配置出10g/L、15g/L、20g/L浓度的电泳液进行电泳。利用扫描电镜(SEM)，激光共聚焦显微镜获得试样膜层微观形貌及粗糙度并通过ImageJ软件测定表面孔隙率和孔径；通过扫描电镜自带能谱仪(EDS)、X射线衍射仪(XRD)分析膜层表面成分及物相；采用CS电化学工作站测试样的耐蚀性和腐蚀行为。

结果显示： MAO-ED复合膜层比MAO膜层更加致密，孔径和孔隙率大大减小，封孔效果好，还可以看到HA粒子在陶瓷层表面的分布情况；经过电泳之后粗糙度明显减小； MAO-ED亲水性更好，更有利于细胞生长；通过耐腐蚀性分析，MAO-ED膜层的耐腐蚀性能更好。

毕业论文关键词：镁合金；微弧氧化；电泳沉积；耐腐蚀性

Abstract Due to the need of social progress and the development of science and technology, the research and development of new alloy materials in the global have played a more and more important role。Magnesium alloy has some special properties such as good biocompatibility and biodegradability, and has been widely studied in the medical field, however, it can’t successfully meet the requirement of the service due to the fast corrosion rate in human body fluid。 This paper aims to prepare the MAO-ED composite coatings on the surface of magnesium alloy and compare to the MAO coating through the performance text, and then the microstructure and performance of MAO-ED composite coating are analyied。

ZK60 magnesium alloy is chosen as the substrate in this paper, and the optimized electrolyte is 6。0g/LNa2SiO3·9H2O + 0。5g/L Ca(CH3COO)2·H2O + 0。8g/L(NaPO3)6 + 0。5g/LNaH2PO4·H2O + 2。8g/L NaOH, and using constant current to prepare MAO coating。 The hydroxyapatite were added to anhydrous ethanol liquid to formulate electrophoretic solution and the concentration is 10g/L、15g/L、20g/L respectively, carrying on the cathode electrophoresis, and then drying and curing processing。 By scanning electron microscopy (SEM) to obtain the microstructure and roughness and get the pore size and porosity by Image J software measurement, adopting scanning electron microscopy (SEM) with energy spectrometer (EDS) and X-ray diffraction (XRD)  to measure surface composition and phase, and using CS electrochemical workstation to test corrosion resistance and corrosion behavior of the sample。

The results show that MAO-ED composite coating is denser, less holes and the size of hole are smaller。 The effect of hole sealing is good and HA particles are successfully deposited on the MAO ceramic layer。 It is obvious that the roughness decreases greatly after electrophoresis and it can be concluded that MAO - ED composite coating has a better hydrophilic and is more conducive to the growth of cell。 Through the analysis of corrosion resistance, corrosion resistance of MAO - ED composite coatings are better。

Keywords: magnesium alloy; micro-arc oxidation; electrophoretic deposition; corrosion resistance

目  录

第一章  绪论 1

1。1 研究背景 1

1。1。1 镁合金的特点 1

1。1。2 镁合金作为生物材料的研究进展和应用