Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (02): 393-398.doi: 10.3866/PKU.WHXB201112163

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Anticorrosion Properties of Modified Nano-TiO2 Films Prepared by Sol-Gel Method

ZHU Yan-Feng, ZHANG Juan, ZHANG Yi-Yong, DING Min, QI Hai-Qing, DU Rong-Gui, LIN Chang-Jian   

  1. State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China
  • Received:2011-08-22 Revised:2011-12-09 Published:2012-01-11
  • Contact: DU Rong-Gui
  • Supported by:

    The project was supported by the National High-Tech Research and Development Program of China (863) (2009AA03Z327) and National Natural Science Foundation of China (21073151, 21173177).

Abstract: TiO2 and B-Fe-Ce-modified TiO2 films were synthesized on the surfaces of 316L stainless steel (316L SS) substrates using a sol-gel and dip-coating method. The properties of the films were characterized by field emission scanning electron microscopy, atomic force microscopy, Raman spectroscopy and energy dispersive spectrometry. The corrosion resistance of the films and their ability to protect stainless steel were investigated by electrochemical impedance spectroscopy and potentiodynamic polarization curves. Both TiO2 and B-Fe-Ce-modified TiO2 films were composed of anatase nanoparticles about 15 and 10 nm in diameter, respectively. Impedance spectra of the stainless steel substrates coated TiO2 films contained semicircles for capacitive reactance in 0.5 mol·L-1 NaCl solution, but the charge transfer resistance of the B-Fe-Ce-TiO2/316L SS electrode was higher than that of the TiO2/316L SS electrode. The potentiodynamic anodic polarization curve of the B-Fe-Ce-TiO2/316L SS electrode showed a larger stable passive region and a higher breakdown potential than the TiO2/316L SS electrode, indicating that the modified film had better corrosion resistance and protective properties for 316L SS.

Key words: Nano-TiO2 film, Sol-gel method, 316L stainless steel, Electrochemical impedance spectroscopy


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