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首页> 外文期刊>Applied Surface Science >Electrophoretic deposition of nanostructured hydroxyapatite coating on AZ91 magnesium alloy implants with different surface treatments
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Electrophoretic deposition of nanostructured hydroxyapatite coating on AZ91 magnesium alloy implants with different surface treatments

机译：在不同表面处理的AZ91镁合金植入物上电泳沉积纳米结构羟基磷灰石涂层

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摘要

Bio-absorbable magnesium (Mg) based alloys have been introduced as innovative orthopedic implants during recent years. It has been specified that rapid degradation of Mg based alloys in physiological environment should be restrained in order to be utilized in orthopedic trauma fixation and vascular intervention. In this developing field of healthcare materials, micro-arc oxidation (MAO), and MgF_2 conversion coating were exploited as surface pre-treatment of AZ91 magnesium alloy to generate a nanostructured hydroxyapatite (n-HAp) coating via electrophoretic deposition (EPD) method. X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and transmission electron microscopy (TEM) techniques were used to characterize the obtained powder and coatings. The potentiodynamic polarization tests were carried out to evaluate the corrosion behavior of the coated and uncoated specimens, and in vitro bioactivity evaluation were performed in simulated body fluid. Results revealed that the MAO-HAp coated AZ91 Mg alloy samples with a rough topography and lower corrosion current density leads to a lower Mg degradation rate accompanied by high bioactivity.
机译：近年来，基于生物吸收性镁（Mg）的合金已被引入作为创新的骨科植入物。已经规定，应限制镁基合金在生理环境中的快速降解，以便用于整形外科的创伤固定和血管干预。在医疗材料这个发展中的领域，微弧氧化（MAO）和MgF_2转化膜被用作AZ91镁合金的表面预处理，通过电泳沉积（EPD）方法生成纳米羟基磷灰石（n-HAp）涂层。使用X射线衍射（XRD），扫描电子显微镜（SEM），傅里叶变换红外光谱（FT-IR）和透射电子显微镜（TEM）技术来表征获得的粉末和涂层。进行了电位动力学极化测试，以评估涂层和未涂层​​样品的腐蚀行为，并在模拟体液中进行体外生物活性评估。结果表明，具有粗糙形貌和较低腐蚀电流密度的MAO / n-HAp涂层AZ91 Mg合金样品可导致较低的Mg降解速率，并具有较高的生物活性。

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