☆☆☆陈明安MgGdYZr合金表面含硫硅烷薄膜的结构与耐蚀性能.pdfVIP

第 18 卷第 1 期 中国有色金属学报 2008 年 1 月 Vol.18 No.1 The Chinese Journal of Nonferrous Metals Jan. 2008 文章编号：1004-0609(2008)01-0024-06 Mg-Gd-Y -Zr 合金表面含硫硅烷薄膜的结构与耐蚀性能 陈明安，杨 汐，张新明，李慧中，路学斌，刘超仁 ( 中南大学 材料科学与工程学院，长沙 410083) 摘 要：采用分子自组装的方法在Mg-Gd-Y-Zr合金表面制备双-(γ-三乙氧基硅丙基) 四硫化物硅烷薄膜。通过傅立 叶变换红外光谱研究薄膜结构特性，用扫描电镜观察薄膜表面形貌，并用电化学极化曲线和交流阻抗测试研究薄 膜的耐蚀性能。结果表明，镁合金表面薄膜通过SiOSi链接形成网状结构，并可能通过形成SiOMg界面相结构与镁 合金表面连接；晶界上薄膜厚度小于其他各处；薄膜将腐蚀电流密度降低2个数量级以上，明显提高了盐水浸泡 过程中的阻抗值。 关键词：Mg-Gd-Y-Zr合金；硅烷；薄膜；腐蚀 中图分类号：TG 174.46 文献标识码：A Structure and corrosion resistance of self-assembled sulf-silane film on surface of Mg-Gd-Y-Zr alloy CHEN Ming-an, YANG Xi, ZHANG Xin-ming, LI Hui-zhong, LU Xue-bin, LIU Chao-ren (School of Materials Science and Engineering, Central South University, Changsha 410083, China) Abstract: Bis-[triethoxysilylpropyl]tetrasulfide silane thin film was prepared, first by self-assembling the silane in solution of ethanol and deionized water and then aged at 120 ℃ for 60 min, on surface of Mg-Gd-Y-Zr magnesium alloy for improvement of its corrosion resistance. Fourier transform infrared spectroscopy (FTIR) was used for structural characterization of the formed silane film. Scanning electron microscope (SEM) was used for observing surface morphology of the film. Electrochemical potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) were used for evaluating the corrosion performances of the film. The results demonstrate that the film is cross linked through SiOSi, which is linked to surface of the Mg alloy through formation of interphases possibly as SiOMg. The film on the