物理化学学报 >> 2006, Vol. 22 >> Issue (08): 1025-1029.doi: 10.3866/PKU.WHXB20060823

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2A12铝合金表面双-(γ-三乙氧基硅丙基)四硫化物薄膜的特性

陈明安;谢玄;戚海英;张新明;李慧中;杨汐   

  1. 中南大学材料科学与工程学院 长沙 410083
  • 收稿日期:2006-02-10 修回日期:2006-03-29 发布日期:2006-08-04
  • 通讯作者: 陈明安 E-mail:ma-chen@mail.csu.edu.cn

Characterization of Self-assembled Bis-[triethoxysilylpropyl]tetrasulfide Silane Films on Surface of 2A12-T6 Aluminum Alloy

CHEN Ming-An;XIE Xuan;QI Hai-Ying;ZHANG Xin-Ming;LI Hui-Zhong;YANG Xi   

  1. School of Materials Science and Engineering, Central South University, Changsha 410083 P.R.China
  • Received:2006-02-10 Revised:2006-03-29 Published:2006-08-04
  • Contact: CHEN Ming-An E-mail:ma-chen@mail.csu.edu.cn

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摘要： 采用傅立叶变换红外光谱分析了2A12-T6铝合金表面自组装双-(?酌-三乙氧基硅丙基)四硫化物硅烷偶联剂(SCA)薄膜结构特征, 并采用电化学极化曲线评价了薄膜的耐蚀性能. 结果表明, 铝材表面自然晾干, SCA薄膜分子之间主要通过氢键连接, 腐蚀电流密度减小1个数量级以上. 120 ℃的加热处理促进铝板表面通过SiOSi链接而形成SCA网状薄膜结构, 并通过在界面上形成SiOAl界面相结构而与铝板表面牢固连接, 腐蚀电流密度降低2个数量级以上. SCA乙醇溶液浸泡处理10 min比浸泡2 s～1 min的铝板表面SCA薄膜内氢键缔合羟基要多.

关键词: 铝合金, 双-(-r-三乙氧基硅丙基)四硫化物, 傅立叶变换红外光谱, 薄膜, 腐蚀

Abstract: Bis-[triethoxysilylpropyl] tetrasulfide silane films were self-assembled on surface of 2A12-T6 aluminum alloy for corrosion protection. The structure of the formed silane films was investigated by using Fourier transform infra-red (FTIR) spectroscopy, and the corrosion performance of the film was evaluated by electrochemical potentiodynamic polarization tests in 3.5% NaCl solution. Compared to the untreated case, both the cathodic and anodic reactions of Al 2A12-T6 treated with the silane films are inhibited obviously. For the film on the surface of Al 2A12-T6 aged at room temperature the corrosion current density is reduced by more than 1 order of magnitude, which is due to the hydrogen bonding between silane molecules and surface of 2A12-T6. For the film on the surface of Al 2A12-T6 cured at temperature of 120 ℃ for 40 min the silane molecules are cross linked through SiOSi, which is closely linked to Al 2A12-T6 surface through formation of SiOAl. The corrosion current density is reduced by more than 2 orders of magnitude. There exist more hydrogen bonded hydroxy groups in the cured film dipped for 10 min in the prepared silane solution than that dipped for 2 s to 1 min.

Key words: Aluminium alloy, Bis-[triethoxysilylpropyl]tetrasulfide, Fourier transform infra-red, Film, Corrosion