Journal of South China University of Technology (Natural Science Edition) ›› 2008, Vol. 36 ›› Issue (7): 77-81.

• Materials Science & Technology • Previous Articles     Next Articles

Structure, Morphology and Corrosion Resistance of Nano-Sized Titanium Dioxide Coating on Low Carbon Steel Surface

Zeng Zhen-ou1  Zhou Min-jie1  Xiao Zheng-wei1  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:2007-08-30 Revised:2008-03-24 Online:2008-07-25 Published:2008-07-25
  • Contact: 曾振欧（1955-），男，教授，主要从事应用电化学和金属表面处理的研究． E-mail:zhouzeng@scut．edu．cn
  • About author:曾振欧（1955-），男，教授，主要从事应用电化学和金属表面处理的研究．
  • Supported by:

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

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Abstract:

Nano-sized titanium dioxide coatings were prepared on low carbon steel after alkaline blackening and heat treatment via the sol-gel method. The structure, morphology and composition of the prepared coatings were then characterized by means of SEM, XRD and XPS, and the corrosion resistance of the coatings was investigated via the electrochemical method. SEM results indicate that the coatings look blue-grey with many small size-variable cracks and fractures on the surface, XRD spectra show that the coatings are of the anatase structure, and XPS resuits indicate that the coatings are mainly composed of Ti, Fe, O and C. Moreover, the tested results of stable potential and Tafel curves demonstrate that the nano-sized TiO2 coatings, which protect the low carbon steel from corrosion, are of better photo-electrochemical properties in 2.5% NaHCO3 solution than in 3% NaCl solution.

Key words: low carbon steel, nano-sized titanium dioxide, coating, morphology, photo-electrochemistry, corrosion protection