Preparation and characterization of anticorrosion Ormosil sol-gel coatings for aluminum alloy

被引：20
作者：
Pan, Xiaoming [1 ]
Wu, Junsheng [1 ]
Ge, Yuanzheng [1 ]
Xiao, Kui [1 ]
Luo, Hong [2 ]
Gao, Shujun [1 ]
Li, Xiaogang [1 ]
机构：
[1] Univ Sci & Technol Beijing, Ctr Corros & Protect, Beijing 100083, Peoples R China
[2] Hohai Univ, Coll Mech & Mat, Nanjing 210098, Jiangsu, Peoples R China
来源：
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY | 2014年 / 72卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Aluminum alloy; Sol-gel; Ormosil coatings; Corrosion resistance; SCANNING KELVIN PROBE; ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; CORROSION PROTECTION PERFORMANCE; POLYMERIC COATINGS; ORGANIC COATINGS; CERIUM NITRATE; AA2024; STEEL; NANOPARTICLES; DELAMINATION;
D O I：
10.1007/s10971-014-3414-5
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Organically modified silicate (Ormosil) coatings have been synthesized through the sol-gel method for corrosion protection of aluminum alloy. Silica-based unmodified coatings were also designed to investigate the effect of tetraethoxysilane (TEOS) content on the properties of the coatings. The surface morphology of the coatings was characterized by scanning electron microscopy. The corrosion resistance was evaluated by immersion test, electrochemical impedance spectroscopy and potentiodynamic polarization measurements. In addition, the surface potential differences of the coated samples were determined by scanning Kelvin probe. The results showed that a better corrosion resistance of unmodified coating was prepared by controlling the TEOS/EtOH/H2O molar ratio of 0.109/1/1.52. Ormosil coatings provided excellent barrier properties and corrosion resistance in comparison with the unmodified sol-gel coatings. The Ormosil coating modified with triethoxyoctylsilane exhibited corrosion resistance properties superior to the other Ormosil coatings after exposure to 3.5 wt% NaCl solution for 10 days.
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页码：8 / 20
页数：13
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