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| Studies of Mechanism on Photogenerated Cathodic Protection of the TiO2-SnO2 Composite Films |
| ;;Changjian Lin |
| 厦门大学化学系 |
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Abstract 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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Received: 17 August 2004
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