In vitro investigation of biodegradable polymeric coating for corrosion resistance of Mg-6Zn-Ca alloy in simulated body fluid
In vitro investigation of biodegradable polymeric coating for corrosion resistance of Mg-6Zn-Ca alloy in simulated body fluid
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DOI：
10.1016/j.msec.2014.05.035
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发表时间：
2014-09-01
影响因子：
7.9
通讯作者：
Khanna, A. S.
中科院分区：
文献类型：
--
作者：
Gaur, Swati;Raman, R. K. Singh;Khanna, A. S.
为提高镁锌钙镁合金的耐蚀性能，延缓该合金在生理环境中的生物降解，研制了一种硅烷基生物降解涂层。对条件进行了优化，以在合金表面形成稳定而均匀的氢氧化层，以促进硅烷与基材的粘合。采用溶胶-凝胶法制备了二乙基磷乙基三乙氧基硅烷(DEPETES)和双[3-(三乙氧基硅基)丙基]四硫化物(BTESPT)两种硅烷的复合涂层。用动电位极化和交流阻抗谱(EIS)对涂层合金在改性模拟体液(m-SBF)中的耐蚀性进行了表征。硅烷涂层提供了显著和持久的耐腐蚀性。在此过程中，监测了裸合金和涂层合金的氢析出和pH变化(如果有的话)。用扫描电子显微镜(SEM)和能谱分析(EDAX)对涂层的形貌进行了表征，用傅立叶变换红外光谱(FTIR)对涂层中的交联度进行了研究。X射线衍射结果表明，在m-SBF中浸泡216h的样品上有水合磷酸镁的存在，磷酸镁具有促进成骨细胞形成和组织愈合的作用。(C)2014爱思唯尔B.V.保留所有权利。
A silane-based biodegradable coating was developed and investigated to improve corrosion resistance of an Mg-6Zn-Ca magnesium alloy to delay the biodegradation of the alloy in the physiological environment. Conditions were optimized to develop a stable and uniform hydroxide layer on the alloys-surface-known to facilitate silane-substrate adhesion. A composite coating of two silanes, namely, diethylphosphatoethyltriethoxysilane (DEPETES) and bis-[3-(triethoxysilyl) propyl] tetrasulfide (BTESPT), was developed, by the sol-gel route. Corrosion resistance of the coated alloy was characterized in a modified-simulated body fluid (m-SBF), using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The silane coating provided significant and durable corrosion resistance. During the course of this, hydrogen evolution and pH variation, if any, were monitored for both bare and coated alloys. The coating morphology was characterized using scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX) and the cross-linking in the coating was studied using Fourier transform infrared spectroscopy (FTIR). As indicated by X-ray diffraction (XRD) results, an important finding was the presence of hydrated magnesium phosphate on the sample that was subjected to immersion in m-SBF for 216 h. Magnesium phosphate is reported to support osteoblast formation and tissue healing. (C) 2014 Elsevier B.V. All rights reserved.