Characterization and Electrochemical Corrosion Behavior of Biological Ceramic Coatings on Magnesium Alloy by Micro-Arc Oxidation
Characterization and Electrochemical Corrosion Behavior of Biological Ceramic Coatings on Magnesium Alloy by Micro-Arc Oxidation
复制标题
镁合金生物陶瓷涂层的微弧氧化表征及电化学腐蚀行为
DOI：
10.1166/jbmb.2014.1428
复制
发表时间：
2014-04
影响因子：
0.5
通讯作者：
Song, Ren Guo
中科院分区：
文献类型：
--
作者：
Xiong, Ying;Lu, Chao;Wang, Chao;Song, Ren Guo
在碱性电解液中，添加和不添加纳米颗粒（Y2O3、CeO2 和 ZrO2）的情况下，通过微弧氧化（MAO）在 AZ31B 镁（Mg）合金样品上制备了生物陶瓷涂层。由于MAO涂层具有孔隙和微裂纹，因此采用电泳沉积（EPD）方法用羟基磷灰石（HA）填充MAO涂层的微孔和微裂纹。通过扫描电子显微镜（SEM）和X射线衍射（XRD）分析了样品的微观结构特征和物相组成。进行划痕测试以评估样品对镁基体的粘附强度和划痕硬度。通过在36.5±0.5℃的模拟体液（SBF）中使用动电位极化测试和电化学阻抗谱（EIS）测试来评估样品的腐蚀行为。结果表明，无论添加纳米粒子，MAO样品的表面特征均未受到明显影响。相反，样品的粘合强度和划痕韧性得到改善，特别是在含有CeO2和ZrO2的溶液中处理的样品。因此，选择在含有 CeO2 和 ZrO2 的溶液中处理的样品进行 EPD 处理。 EPD 处理在含有具有生物活性的纳米颗粒 (HA) 的悬浮液中进行。此外，动电位极化测试结果表明，纳米粒子对MAO样品的耐腐蚀性没有显着影响，EPD处理可以提高MAO样品的耐腐蚀性。
Biological ceramic coatings have been prepared on AZ31B magnesium (Mg) alloy specimens by micro-arc oxidation (MAO) in alkaline electrolyte, with and without the addition of nano-particles (Y2O3, CeO2 and ZrO2). Due to the MAO coating porosity and with micro-cracks, electrophoresis deposition (EPD) has been applied to fill the micro-pores and micro-cracks of MAO coating with hydroxyapatite (HA). The microstructure feature and phase composition of samples were analyzed by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Scratch tests were performed for evaluating the adhesion strength and scratch hardness of the samples to the Mg substrate. The corrosion behavior of samples were evaluated by using potentiodynamic polarization tests and electrochemical impedance spectroscopy (EIS) tests in simulated body fluid (SBF) at 36.5 ± 0.5 °C. The results indicated that regardless of adding nano-particles, the surface feature of MAO samples were not affected significantly. Conversely, the adhesive strength and scratch toughness of samples were improved, especially for the samples treated in the solutions containing CeO2 and ZrO2. For this reason, samples treated in solutions containing CeO2 and ZrO2 were chosen for EPD treatment. EPD treatment carried out in suspensions containing nano-particles (HA) with biological activity. Furthermore, the results of potentiodynamic polarization tests showed that nano-particles do not affect the corrosion resistance of MAO samples significantly and that EPD treatment can improve the corrosion resistance of MAO samples.