CdS/TiO2纳米复合材料的制备及其对304不锈钢的光生阴极保护性能

Preparation of CdS/TiO2 Nanocomposite Materials and Their Photocathode Protection Properties for 304 Stainless Steel

为了提高TiO2的光电性能及其对光生电子的利用率,从而提高TiO2对304不锈钢的阴极保护性能,采用阳极氧化法制备TiO2纳米管,通过超声辅助连续离子沉淀法对TiO2纳米管进行CdS修饰改性。应用X射线衍射仪(XRD)、扫描电镜(SEM)及其配套的EDS能谱对CdS/TiO2的表面形貌、元素分布及晶型特征进行表征;利用电化学分析方法研究了复合次数对CdS/TiO2的光电性能影响,考察了CdS/TiO2复合材料对304不锈钢的光生阴极保护性能。结果表明:复合15次的CdS/TiO2复合材料具有更加优良的光电性能;光照下CdS/TiO2复合材料对304不锈钢的光生阴极保护性能显著优于纯TiO2;在暗态下CdS/TiO2复合材料储能效果良好,可延长对金属的阴极保护作用时间。

In order to improve the photoelectric properties of TiO2 and the utilization rate of photo-induced electrons,and further enhance the cathodic protection performance of TiO2 for 304 stainless steel,TiO2 nanotubes were prepared by anodic oxidation method,and decorated by CdS through ultrasound-assisted successive ionic layer adsorption and reaction method.X-ray diffractometer(XRD),scanning electron microscopy(SEM)and energy dispersive spectrometer(EDS)were used to characterize the surface morphology,element distribution and crystalline characteristics of CdS/TiO2.In addition,the photoelectric properties of CdS/TiO2 nanotubes under different deposition cycle times were investigated by electrochemical analysis method,and the photocathodic protection performance of CdS/TiO2 coupled with 304 stainless steel was investigated.Results showed that CdS/TiO2 composite film with 15 times cycles had better photoelectric properties.Meanwhile,under the lighting conditions,the cathodic protection performance of CdS/TiO2 nanocomposite materials with 15 times cycles was remarkably higher than that of pure TiO2 film.At the dark state,CdS/TiO2 nanocomposite materials possessed excellent energy storage effect,which could prolong the actuation duration of anodic protection for metal.