Journal of South China University of Technology (Natural Science Edition) ›› 2009, Vol. 37 ›› Issue (6): 1-6.

• Chemistry & Chemical Engineering •     Next Articles

Preparation and Photo-Cathodic Protection Properties of Nano-Sized TiO2/SnO2 Coatings

Zeng Zhen-ou1  Zhou Min-jie1  Zhong Li1  Zhao Guo-peng2   

  1. 1. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China; 2. Guangzhou Etsing Plating Research Institute, Guangzhou 510170, Guangdong, China
  • Received:2008-08-02 Revised:2008-09-28 Online:2009-06-25 Published:2009-06-25
  • Contact: 曾振欧（1955-），男，教授，主要从事应用电化学研究． E-mail:zhouzeng@scut．edu．cn
  • About author:曾振欧（1955-），男，教授，主要从事应用电化学研究．
  • Supported by:

    广东省科技计划项目（2005816001028）;广州市科技攻关项目（0552108002）

PDF

876

Abstract:

Nano-sized double-layer TiO2/SnO2coatings were prepared on Type 304 stainless steel substrate via the sol-gel method. The ＂photo-electrochemical effect and photo-cathodic protection properties of the coatings were then investigated by measuring the stable potential. Moreover, the surface morphology, structure and composition of the prepared coatings were characterized by means of SEM, XRD and XPS. The results show that  the nano-sized double-layer TiO2/SnO2 coatings prepared by dipping TiO2 and SnO2 coatings respectively for 4 times are of the best photo-electrochemical effect, charge-storage capability and photo-cathodic protection properties, which provides the coated Type 304 stainless steel with a cathodic protection lasting 7 h after the irradiation by UV illumination for 1 h ;  the coatings are uniform and compact, with continuous surface, anatase TiO2 and rutile SnO2; and  both the outer and the inner layers of the coatings are composed of Ti, Sn, C and O. The mechanism of photo-cathodic protection of the nano-sized TiO2/SnO2 coatings is also discussed in the paper.

Key words: nano-sized titanium dioxide, nano-sized tin dioxide, photo-electrochemistry, photo-cathodic protection, corrosion protection