用溶胶-凝胶法和旋转涂膜技术在导电玻璃(ITO)表面构筑纳米TiO2膜和纳米TiO2-SnO 2复合膜，应用AFM、XRD对膜的形貌及晶体结构进行表征.用光电化学和腐蚀电化学相结合技 术，通过测试时间—电位曲线和交流阻抗谱研究光生阴极保护状态下316L不锈钢电极在05 mol/L NaCl溶液中的微观界面电荷分布及电子传递规律，探讨光生阴极保护的作用机理.结果表明以TiO2—SnO2复合膜作为光生阳极时，在紫外光照下，316L不锈钢电极可 处 在阴极保护状态，并且在切断光源后，光生电极电位仍可在较长的一段时间内维持在-02 V左右，仍具有一定的阴极保护作用.
By the sol-gel method and spin-coating process,the nano TiO2-SnO2 composite films have been prepared on the surface of the indi um-tin oxide(ITO)glass and 316L stainless steel.The morphology and crystalline s tructure have been characterized by AFM and XRD.The anticorrosion property of th e composite coatings has been studied under dark condition by electrochemical me thods.Similarly,the performance of photogenerated cathodic protection of the com posite coatings has been measured in 0.5 mol/L NaCl solution(pH=46)by combinin g photoelectrochemical system with corrosion electrochemical system under UV illu mination.The results show that in dark the nano TiO2-SnO2 composite films ha ve a poorer anticorrosion property than that of the nano TiO2 coatings.Under U V illumination condition the composite films as a photoanode provide a cathodic protection for 316L,and when the UV light is shut off,its photogenerated potenti al can remain a cathodic protection of metal for 6 hours.The mechanism of the ph otogenerated cathodic protection has also been studied by electrochemical impeda nce spectra.
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