微弧氧化法制备镁基羟基磷灰石/碳纳米管复合生物涂层及其性能研究

 通过化学沉淀法制备了羟基磷灰石/碳纳米管纳米(HA/CNTs)复合粉体,并作为电解液的添加剂,采用微弧氧化方法(MAO)制备了镁合金表面MAO/HA/CNTs 复合活性涂层。分别采用扫描电子显微镜(SEM)、X 射线衍射分析(XRD)、傅里叶红外光谱(FTIR)和电化学工作站,研究所制备的复合粉体的形貌和物相组成、复合粉体对微弧氧化涂层表面形貌和在模拟体液(SBF)中耐腐蚀性能和生物活性的影响。结果表明,所制备的HA/CNTs 复合粉体结晶良好,无其他杂质相;复合粉体在微弧氧化过程中沉积在样品表面,对微弧氧化涂层起到封孔作用。MAO/HA/CNTs 样品的腐蚀电位为-1.50 V,经过30 天的SBF 浸泡后,表面沉积了大量的亚微米级别的颗粒沉积物,相比于镁基体和MAO 样品具有更好的生物活性和耐腐蚀性。

Synthesis and properties of hydroxyapatite/CNTs composite coating on magnesium alloy by micro-arc oxidation

MAO/HA/CNTs composite coating is synthesized on magnesium alloy by micro arc oxidation (MAO) with Hydroxyapatite/CNTs (HA/CNTs) nano composite powders as additives, which is obtained by chemical precipitation method. SEM, XRD, FTIR and electrochemical workstation are adopted to investigate morphology and phase composition of as-prepared composite coating, corrosion resistance and bioactivities of samples in SBF solutions. The results show that the prepared HA/CNTs composite powders are well crystallized and without any impurities. The HA/CNTs can be deposited on the surface of samples successfully during MAO process, sealing the holes of MAO coating. Moreover, the corrosion potential of MAO/HA/CNTs modified samples is -1.50 V; the surface is deposited by a large number of submicron scale particles after soaking in SBF for 30 days, which shows better biological activity and higher corrosion resistance compared with Mg substrate and MAO modified samples.