物理化学学报 >> 2009, Vol. 25 >> Issue (12): 2581-2589.doi: 10.3866/PKU.WHXB20091214

研究论文 上一篇    下一篇

铝合金表面原位自组装超疏水膜层的制备及耐蚀性能

李松梅, 周思卓, 刘建华   

  1. 北京航空航天大学材料科学与工程学院, 空天材料与服役教育部重点实验室, 北京 100191
  • 收稿日期:2009-07-15 修回日期:2009-09-14 发布日期:2009-11-27
  • 通讯作者: 李松梅 E-mail:Songmei_li@buaa.edu.cn

Fabrication and Anti-Corrosion Property of In situ Self-Assembled Super-Hydrophobic Films on Aluminum Alloys

LI Song-Mei, ZHOU Si-Zhuo, LIU Jian-Hua   

  1. Key Laboratory of Aerospace Materials and Performance of the Ministry of Education, School of Materials Science and Engineering, Beihang University, Beijing 100191, P. R. China
  • Received:2009-07-15 Revised:2009-09-14 Published:2009-11-27
  • Contact: LI Song-Mei E-mail:Songmei_li@buaa.edu.cn

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摘要：

采用阳极氧化法在铝合金表面原位构造粗糙结构, 经表面自组装硅氧烷后得到超疏水自清洁表面, 与水滴的接触角最大可达157.5°±2.0°, 接触角滞后小于3°. 通过傅立叶变换红外(FT-IR)光谱分析仪、场发射扫描电子显微镜(FE-SEM)、能谱仪(EDS)、原子力显微镜(AFM)和接触角测试对阳极氧化电流密度、硅氧烷溶液中水的含量和自组装时间等参数进行了分析, 并得到制备超疏水自清洁表面的最优工艺参数. FE-SEM及AFM的测试结果表明, 由自组装硅氧烷膜层的无序性形成的纳米结构和阳极氧化构造的微米级粗糙结构与硅氧烷膜层的低表面能的协同作用构成了稳定的超疏水表面. 电化学测试(动电位极化)的结果表明, 原位自组装超疏水膜层极大地提高了铝合金的耐蚀性.

关键词: 超疏水, 原位, 自组装, 硅氧烷, 耐蚀性

Abstract:

In situ rough structures on an aluminum alloy were formed by anodic oxidation method. After siloxane self-assembly on the rough structures, super-hydrophobic and self-cleaning films were fabricated. The static contact angle of the super-hydrophobic surface with a water drop was 157.5°±2.0° at its maximum and the contact angle hysteresis was less than 3°. The influence of anodic oxidation current density, the water content of the siloxane solution, and self-assembly time on filmformation were studied by Fourier transforminfrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FE-SEM), energy dispersive spectroscopy (EDS), atomic force microscopy (AFM) and contact angle measurements. Optimum parameters to fabricate the super-hydrophobic surface were obtained. FE-SEM and AFM results indicated that microstructures were obtained by anodic oxidation and nanostructures were obtained by the disorder of self-assembly film. Stable super-hydrophobic surfaces were produced by the cooperation of micro/nano-structures and the low surface free energy of the siloxane films. The electrochemical measurement (potentiodynamic polarization) indicated that the anti-corrosion property of the aluminumalloy was greatly improved by the in situ super-hydrophobic film.

Key words: Super-hydrophobic, In situ, Self-assembly, Siloxane, Anti-corrosion property