关键词: 纳米TiO2薄膜, 316L不锈钢, 腐蚀与防护

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.