摘要
为了研究淫羊藿苷含量对镁/超声微弧氧化/壳聚糖/淫羊藿苷(Mg/UMAO/CS/IC)涂层性能的影响,并提高纯镁的耐蚀性,采用电泳沉积(EPD)和UMAO技术在纯镁基体上制备Mg/UMAO/CS/IC涂层。采用扫描电子显微镜(SEM)、X射线衍射(XRD)、原子力显微镜(AFM)和傅立叶变换红外光谱(FTIR)对涂层的特征进行分析。对不同样品在模拟体液中进行了电化学阻抗和动电位极化的腐蚀行为研究。结果表明:当IC含量为0.4 g/L时CS/IC层具有较好的封孔效果。添加不同IC含量的Mg/UMAO/CS/IC涂层均由Mg、MgO、CS和Mg2SiO4组成。不同IC含量涂层的自腐蚀电流密度(icorr)比Mg至少都低一个数量级,能为镁基底提供更有效的保护。IC含量为0.4 g/L时Mg/UMAO/CS/IC涂层的耐蚀性更好,自腐蚀电流密度(1.667×10^-6A/cm^2)最小。Mg/UMAO/CS/IC涂层可有效解决纯镁在临床骨内固定应用上降解过快的问题。
To study the effects of icariin contents on the characteristics of magnesium/ultrasonic micro-arc oxidation/chitosan/icariin(Mg/UMAO/CS/IC), and enhance the corrosion resistance of pure magnesium, Mg/UMAO/CS/IC coating was prepared using a combined method of UMAO with electrophoretic deposition(EPD) technique on the Mg substrate. The coatings were characterized by scanning electron microscopy(SEM), X-ray diffraction(XRD), atomic force microscopy(AFM) and Fourier transform infrared(FTIR) spectroscopy. Corrosion resistance was investigated by electrochemical impedance spectroscopy and potentiodynamic polarization in a simulated body fluid(SBF) solution. The results show that the UMAO coating is well sealed by CS/IC coating with a content of 0.4 g/L IC. The coatings with various IC contents all consists of Mg, MgO, CS and Mg2SiO4 phase. The corrosion current density of the coatings with various IC contents are at least one order of magnitude lower compared with that of Mg substrate, which implies that it can provide a more effective protection for Mg substrate. With a content of 0.4 g/L IC, the Mg/UMAO/CS/IC coating has the best corrosion resistance, evidenced by the minimum corrosion current density(1.667×10^-6 A/cm^2). Mg/UMAO/CS/IC coating effectively solves the problem of high corrosion rate of Mg in clinical bone fixation applications.
作者
王晶彦
李慕勤
张德秋
王静
庄明辉
彭书浩
WANG Jingyan;LI Muqin;ZHANG Deqiu;WANG Jing;ZHUANG Minghui;PENG Shuhao(Key Biomedical Materials Laboratory of Colleges and Universities in Heilongjiang Province,Jiamusi University,Jiamusi 154007,China)
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2019年第5期86-94,共9页
China Surface Engineering
基金
黑龙江省教育厅项目基本科研业务费基础研究项目(2016-KYYWF-0564)~~
关键词
纯镁
超声微弧氧化
电泳沉积
淫羊藿苷
耐蚀性
pure magnesium
ultrasonic micro-arc oxidation(UMAO)
electrophoretic deposition(EPD)
icariin(IC)
corrosion resistance
作者简介
通信作者:李慕勤(1955-),女(汉),教授,博士,研究方向:生物医学材料表面改性,E-mail:jmsdxlimuqin@163.com。
