Journal of South China University of Technology (Natural Science Edition) ›› 2007, Vol. 35 ›› Issue (11): 72-76.

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Nano-Sized SiO2-Coated Aluminum Pigments Prepared by Sol-Gel Method

Li Li-jun  Pi Pi-hui  Wen Xiu-fang  Cheng Jiang  Yang Zhuo-ru   

  1. School of Chemical and Energy Engineering, South China Univ. of Tech. , Guangzhou 510640， Guangdong , China
  • Received:2006-09-05 Online:2007-11-25 Published:2007-11-25
  • Contact: 李利君(1980-) ，女，博士生，主要从事铝颜料表部改性的研究。 E-mail:lilijunbuct@ sohu. com
  • About author:李利君(1980-) ，女，博士生，主要从事铝颜料表部改性的研究。
  • Supported by:

    广东省自然科学基金资助项目(07006528)

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Abstract:

In order to improve the alkali resistance , nano-sized SiO2 -coated aluminum pigments were prepared by means of sol-gel method in ethanoVwater medium and were characterized by means of SEM, XRD and Ff-IR. The alkali resistance of the product was then investigated in alkaline medium. The results show that, at a H2O: NH3 : TEOS molar ratio of 32. 7: 4. 4: 1 , the compact nano-sized SiO2 fi1ms form on the surface of aluminum pigments , thus greatly improving the alkali resistance of the pigments. The excellent alkali resistance of the coated pigments is also verified by dipping it in an alkaline medium with a pH value of 11 for 60 days ， without any hydrogen being evolved.

Key words: sol-gel method, nano-sized SiO2, encapsulation, aluminum corrosion