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Citation: SHEN Guang-Xia, CHEN Yi-Cong, LIN Chang-Jian. Preparation of Nano TiO₂-V₂O₅ Composite Coating and Its Functions in Corrosion Protection of Metals[J]. Acta Physico-Chimica Sinica, ;2005, 21(05): 485-489. doi: 10.3866/PKU.WHXB20050505 shu

Preparation of Nano TiO₂-V₂O₅ Composite Coating and Its Functions in Corrosion Protection of Metals

1.
State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, Xiamen University, Xiamen 361005

Received Date: 17 August 2004
Available Online: 15 May 2005

Using sol-gel method and dip-coating process, TiO₂ and sandwiched TiO₂-V₂O₅ composite films (TiO₂/TiO₂-V₂O₅/TiO₂) have been used to coat the surface of 316L stainless steel. The morphology and structure of the films have been analyzed by AFM and XRD. The anticorrosion properties of the composite films have been studied under dark condition by electrochemical methods. The performance of photogenerated cathodic protection of the composite coatings has been measured in 0.5 mol•L^-1 NaCl solution (pH=4.6) by combining photoelectrochemical system with corrosion electrochemical system under UV illumination. The results show a significant dual protective performance for the composite films. Under UV illumination the photo-generated cathodic protection is active, and after the UV light is shut off, it takes about 6 hours for the photogenerated potential to shift from －0.25 V to －0.14 V, which implies a possibility to remain a cathodic protection of metal even in the dark condition. Furthermore, under the dark condition the sandwiched TiO₂/TiO₂-V₂O₅/TiO₂ composite coatings as excellent barrier layers are able to provide a protection for the 316L in a corrosive environment.
- Photogenerated cathodic protection; TiO₂-V₂O₅ composite films; Corrosion protection
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沈阳化工大学材料科学与工程学院沈阳 110142

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Preparation of Nano TiO₂-V₂O₅ Composite Coating and Its Functions in Corrosion Protection of Metals