College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, China.
College of Basic Medical, Shanxi Medical University, Taiyuan, Shanxi 030001, China.
J Nanosci Nanotechnol. 2019 Feb 1;19(2):810-818. doi: 10.1166/jnn.2019.15746.
Hydroxyapatite (HA) nanocoating was electrodeposited on the surface mechanical attrition treated (SMATed) AZ31 magnesium alloy. Phases, morphologies and the adhesion of coating were characterized by X-ray diffraction, scanning electron microscopy (SEM) and 3D optical profiler. The corrosion resistance of the HA coating was tested by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results showed that the HA coating on SMATed sample had a better crystallization than that on original one. The thickness of HA coating increased from 25 to 40 m. The bonding strength between HA coating and SMATed substrate was higher than that between the coating and untreated counterpart. Potentiodynamic polarization and EIS demonstrated that the corrosion current density of HA coating on SMATed substrate decreased by 30.84% than that on original. The corrosion potential shifted 80.3 mV to the positive direction. The corrosion resistance of coatings on SMATed sample was significantly enhanced. The immersion experiments showed that the HA coatings on SMATed sample exhibited a better biological activity.
水羟磷灰石 (HA) 纳米涂层通过在表面机械研磨处理 (SMATed) 的 AZ31 镁合金上进行电泳沉积而生成。采用 X 射线衍射、扫描电子显微镜 (SEM) 和 3D 光学轮廓仪对涂层的相、形貌和附着力进行了表征。通过动电位极化和电化学阻抗谱 (EIS) 测试了 HA 涂层的耐腐蚀性。结果表明，SMATed 处理后的样品上的 HA 涂层比原始样品具有更好的结晶度。HA 涂层的厚度从 25 增加到 40 µm。HA 涂层与 SMATed 基底之间的结合强度高于涂层与未处理基底之间的结合强度。动电位极化和 EIS 表明，SMATed 基底上的 HA 涂层的腐蚀电流密度比原始样品降低了 30.84%。腐蚀电位向正方向移动了 80.3 mV。SMATed 样品上涂层的耐腐蚀性得到了显著提高。浸泡实验表明，SMATed 样品上的 HA 涂层具有更好的生物活性。
