纯镁表面硅烷/透明质酸钠复合涂层的结构及腐蚀性能研究

纯镁因较快的腐蚀速率使其用于手术移植材料成为了一个障碍。为了控制其降解速率,本研究采用BTSE(1,2-(三乙氧基硅基)乙烷)硅烷化处理和共键嫁接1-(3-二甲氨基丙基)-3-乙基碳二亚胺盐酸盐(EDC)/N-羟基丁二酰亚胺(NHS)交联改性的透明质酸钠涂层的两步制备工艺在纯镁上制备复合涂层。同时使用红外光谱(FTIR)、X射线光电子能谱(XPS)、原子力显微镜(AFM)和静态接触角方法(CA)分析涂层的物化性能,通过电化学行为分析涂层在模拟体液中的耐腐蚀性能。FTIR和XPS结果表明在纯镁表面上成功的制备出复合涂层;其他结果显示,交联透明质酸钠涂层表面较裸镁、硅烷表面更平整、光滑,且呈现出亲水性,提高了其生物活性;与未改性的纯镁相比,复合涂层的腐蚀电流密度减小了2个数量级,阻抗值提高3个数量级,表现出很好的耐腐蚀性能。表明这种复合涂层作为手术移植材料在医学上具有很大的应用前景。

Structure and Corrosion performance of silane/ sodium hyaluronate composite coating on pure magnesium

Pure magnesium has become a barrier to surgical transplant materials for its rapid corrosion rate. In order to control its degradation rate, this study presents a two-step procedure to prepare composite coating by BTSE(1,2-Bis(triethoxysilyl)ethane) silane treatment and covalent bond grafting crosslinking modification sodium hyaluronate via EDC-NHS. At the same time, the physical and chemical properties of the coating are analyzed by infrared spectrum (FTIR), X ray photoelectron spectroscopy(XPS), atomic force microscope (AFM) and static contact angle method (CA),the corrosion resistance of the coating in simulated body fluid is analyzed by electrochemical behavior. The results of FTIR and XPS show that the composite coating is successfully prepared on the surface of pure magnesium. Other results reveal that the surface of the cross-linked sodium hyaluronate coating is more smooth than that of bare magnesium and silane, also taked on hydrophilicity to improve its biological activity. Compared with the unmodified pure magnesium, the corrosion current density of the composite coating is reduced by two orders of magnitude, the impedance value is increased by three orders of magnitude, demonstrating better corrosion resistance of the composite coating. The results show that the composite coating as surgical transplant material has great prospect in medicine.