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用溶胶凝胶旋涂工艺在304不锈钢表面制备了多壁纳米碳管MWCNT/TiO_2复合薄膜,用X射线衍射技术和电子显微技术研究了复合薄膜的物相组成与显微形貌,同时采用电化学分析手段,分别在250 W紫外灯和28 W节能灯的照射下,表征了MWCNT/TiO_2复合薄膜在3%NaCl溶液和海水介质中对304不锈钢的光阴极防腐蚀性能。研究结果表明,经450℃煅烧和加入管径为20～40 nm纳米碳管制备的MWCNT/TiO_2复合薄膜,不论是在紫外光还是白光激发下都表现出了比纯TiO_2薄膜更加优良的光电性能。同时也表明在3%NaCl溶液和海水介质中纳米碳管的引入都可有效增强TiO_2薄膜对304不锈钢的光阴极防腐蚀性能。
Multi-walled carbon nanotubes MWCNT / TiO 2 composite films were prepared on the surface of 304 stainless steel by sol-gel spin-coating. The phase composition and microstructure of the composite films were investigated by X-ray diffraction and electron microscopy. The electrochemical corrosion resistance of MWCNT / TiO_2 composite film to 304 stainless steel in 3% NaCl solution and seawater medium was characterized by means of electrochemical analysis and irradiation with 250 W UV lamp and 28 W CFL lamp respectively. The results show that the MWCNT / TiO_2 composite films prepared by calcining and adding carbon nanotubes with diameter of 20 ~ 40 nm at 450 ℃ exhibit better photocatalytic properties than pure TiO_2 films both in UV light and white light . It also shows that the introduction of carbon nanotubes in 3% NaCl solution and seawater medium can effectively enhance the photocathode corrosion resistance of TiO_2 film on 304 stainless steel.