采用溶胶凝胶法在304不锈钢表面制备了纳米TiO2/Sb2O5叠层涂层. 用扫描电子显微镜（SEM）、X射线衍射（XRD）、X射线光电子能谱(XPS)对涂层表面形貌、晶体结构以及组成进行表征. 采用电化学方法研究涂层的光电化学性能与光生阴极保护特性. 结果表明，所制备的纳米TiO2/Sb2O5叠层涂层表面连续、均匀、致密；XRD分析表明纳米TiO2为锐钛矿型；XPS分析表明纳米涂层表面与内层均由Ti、Sb、O、C四种元素组成；稳定电位与极化曲线测试表明，在3%NaCl溶液中，纳米TiO2/Sb2O5叠层涂层的光电化学性能低于纯纳米TiO2涂层，但纳米TiO2/Sb2O5涂层经紫外光照1h，停止紫外光照后的延时阴极保护作用可达4h. 通过研究分析，提出了一种新的纳米叠层涂层光生阴极保护作用机理.
Nano-sized TiO2/Sb2O5 bilayer coatings were prepared on type 304 stainless steel substrate by solgel method. Surface morphology, structure and composition of the asprepared TiO2/Sb2O5 coatings were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscope (XPS). The performance of photoelectrochemical and photogenerated cathodic protection of the coatings was investigated using the electrochemical method. SEM results indicate that the coating surface is continuous, uniform and dense, XRD results show that the coating is of anatase TiO2, XPS results indicate the outer and inner coatings are mainly composed of Ti, Sb, C and O elements. Moreover, the test results of the steady potential and polarization curves demonstrate that the nanosized TiO2/Sb2O5 bilayer coating has worsen photoelectrochemical properties than the plain nanosized TiO2 coating in 3% NaCl solution. Type 304 stainless steel coated with the bilayer coating can maintain cathodic protection for 4h in the dark after irradiation by UV illumination for 1h. In addition, a novel mechanism of the photogenerated cathodic protection for the bilayer coating is put forward.
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