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Journal of Electrochemistry ›› 2005, Vol. 11 ›› Issue (1): 20-26.

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Corrosion Resistance for TiO_2 Thin Films Coated 316L Stainless Steel in the NaCl Solution

SHEN Guang-xia, CHEN Yi-cong, LIN Chang-jian~*   

  1. (Department of Chemistry, State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China
  • Received:2005-02-28 Revised:2005-02-28 Online:2005-02-28 Published:2005-02-28

Abstract: The nano-TiO_2 thin films have been deposited on the 316L stainless steel by sol-gel and the dip- coating methods. Hydrothermal post-treatment leads to crack-free coatings. Meanwhile, the surface structure and properties are optimized. Surface morphology, structure and properties are characterized by XRD, and SEM technologies. The results have shown that the surface of coatings is porous, uniform and orderly, the particle diameters are in the range of 15~18nm and the pores are about 4~8nm and TiO_2 is anatase. The results of electrochemical measurements show that in the NaCl solution with pH ≥ 2 and concentration below 1mol/L, the nano-TiO_2 coatings with thinkness 375~464nm have most excellent anticorrosion properties. Compareing with bare 316L stainless steel, the corrosion current for coating electrodes in 0.5 mol/L NaCl solution has cut down 2 magnitude and the corrosion resistance R_(p) has also decreased nearly 2 magnitude.

Key words: Nano-TiO_2 thin films, 316Lstainless steel, Corrosion protection

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