TiO_2薄膜的制备及其对304不锈钢防腐性能的研究

Preparation of TiO_2 Thin Films and Study of Its Corrosion Resistance Performance for 304 Stainless Steel

采用过氧钛酸溶胶凝胶法(sol-gel)制备TiO2溶胶,并用浸渍-提拉法在304不锈钢(304SS)上制备TiO2薄膜。利用X射线衍射仪(XRD),原子力显微镜(AFM)和紫外-可见分光光度计(UV/Vis)表征了TiO2晶型、薄膜表面形貌以及光吸收性能。通过极化曲线法分别研究了在暗态和光照条件下TiO2薄膜对304SS的防腐性能。结果表明:在暗态下,镀膜厚度为240.7nm,表面粗糙度为3.64nm的TiO2薄膜有最佳的机械防腐性能,腐蚀速率可从6.32×10-6 mm/a降低到5.65×10-9 mm/a;在光照条件下,膜厚294.3nm,处理温度为400℃,只有单一锐钛矿晶型的TiO2薄膜,对304SS的阴极保护性能较好,腐蚀电位可由-130mV降到-319mV。

In this study ,TiO2 sol is prepared by peracetic titanate sol-gel method ,and TiO2 thin film is prepared on 304 stainless steel （304SS） by dipping-pulling method .X-ray diffraction （XRD） ,atomic force microscopy （AFM ） and UV-visible absorption spectroscopy （UV/Vis） are used to characterize the crystal form ,surface morphology of TiO2 thin film and optical absorption property .By means of polarization curves methods ,we studies the anticorrosion performance of TiO2 thin film for 304SS in dark and light condition respectively .The results show that in dark condition ,TiO2 thin films with the thickness of 240.7 nm and surface roughness of 3 .64 nm had the best mechanical corrosion resistance property ,and the corrosion rate can reduce from 6 .32 ＆#215; 10-6 mm/a to 5 .65 ＆#215; 10-9 mm/a;in light condition ,w hen the thick-ness of TiO2 thin films is 294 .3 nm and the treatment temperature is 400℃ ,only TiO2 thin films with sin-gle anatase form can obtain the best cathodic protection property for 304SS ,and the corrosion potential can reduce from -130 mV to -319 mV .