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Journal of Chinese Society for Corrosion and protection  2014, Vol. 34 Issue (6): 507-514    DOI: 10.11902/1005.4537.2013.215
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Preparation of ZnO/TiO2 Composite Film on 304 Stainless Steel and Its Photo-cathodic Protection Properties
XU Hongmei, LIU Wei(), CAO Lixin, SU Ge, GAO Rongjie
Institute of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China
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Abstract  

ZnO/TiO2 composite film was prepared on the surface of 304 stainless steel by sol-gel technique and spin coating method. The phase composition and microstructure of the as-prepared ZnO/TiO2 composite film was characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. The effect of the preparation procedure and calcination temperature on the photoelectric property has been investigated and the photocathodic protection performance of such composite film for 304 stainless steel was also evaluated in 3.0%NaCl solution by using the electrochemical method. The results indicate that the composite film prepared by two-step procedure with proper calcination temperature exhibits excellent photo-electrochemical performance. The photocathodic protection property of ZnO/TiO2 composite film for 304 stainless steel under UV light illumination is significantly superior to that of pure TiO2 film and ZnO film respectively.
Key words:  304 stainless steel      ZnO/TiO2 composite film      photo-electrochemical      photocathodic protection     
ZTFLH:  TG134.1  
  TG174.4  
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Hongmei XU
Wei LIU
Lixin CAO
Ge SU
Rongjie GAO

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XU Hongmei, LIU Wei, CAO Lixin, SU Ge, GAO Rongjie. Preparation of ZnO/TiO2 Composite Film on 304 Stainless Steel and Its Photo-cathodic Protection Properties. Journal of Chinese Society for Corrosion and protection, 2014, 34(6): 507-514.

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https://www.jcscp.org/EN/10.11902/1005.4537.2013.215     OR     https://www.jcscp.org/EN/Y2014/V34/I6/507

Fig.1  XRD patterns of ZnO film (a) and ZnO/TiO2 composite film (b) heated at various temperatures
Fig.2  SEM images of the surface (a~c) and the fragment (d~f) of ZnO film heated at 400 ℃ (a, d), 500 ℃ (b, e) and 600 ℃ (c, f)
Fig.3  SEM images of the ZnO/TiO2 composite film (a), the fracture morphology of the ZnO/TiO2 composite film (b), the enlarged view of middle layer (c) and bottom layer (d)
Fig.4  Varitions of the open circuit potential with time for the ZnO/TiO2 composite films parpared in the different composite modes: (a) ZnO film, (b) TiO2 film, (c) ZnO/TiO2 mixing film, (d) ZnO/TiO2 composite film prepared by layered coating and one-step heating method, (e) ZnO/TiO2 composite film prepared by layered coating and double-step heating method
Fig.5  Open circle potentials (a) and current density (b) of the ZnO/TiO2 composite film as a function of the annealing temperature of ZnO
Fig.6  Open circle potentials (a) and the current density (b) of the ZnO/TiO2 composite film as a function of the annealing temperature
Fig.7  Polarization curves of 304SS without and with double pure TiO2 layers or ZnO/TiO2 composite film in 3.0%NaCl solution in the presence and absence of UV illumination
Electrode Rs / Ω Qf Rf / Ω Qdl Rt / Ω
Yo n Yo n
Bare 304 SSa 5.72 1.19×10-4 0.822 2.42×103 3.64×10-5 0.989 6.37×104
2Ta 8.06 1.13×10-4 0.534 9.31×104 5.97×10-5 0.843 5.65×105
Ti/Zna 6.29 1.17×10-4 0.865 3.94×103 4.16×10-5 0.827 3.09×105
2Tb 7.04 2.07×10-5 0.797 9.16 2.20×10-5 0.790 1.20×104
Ti/Znb 5.04 1.96×10-5 0.693 9.66×101 8.13×10-5 0.980 6.37×103
Table 1  Fitting impedance parameters of Nyquist plots using the equivalent circuit
Fig.8  Nyquist plots of electrodes samples in the absence and presence of UV light in 3.0%NaCl solution and its corresponding equivalent circuit
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