Low-temperature liquid phase deposited TiO_2 films on stainless steel for photogenerated cathodic protection applications

摘要

The low-temperature synthesis of anatase TiO_2 films was an imperative requirement for their application to corrosion prevention of metals. In this paper, a liquid phase deposition (LPD) technique was developed to prepare TiO_2 films on SUS304 stainless steel (304SS) at a relatively low temperature (80°C). The as-prepared films were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy and X-ray photon spectroscopy (XPS). It was observed that a dense and crack-free anatase TiO_2 film with a thickness about 300 nm was obtained. The film contained some fluorine and nitrogen elements, and the amounts of these impurities were greatly decreased upon calcination. Under the white light illumination, the electrode potential of TiO_2 coated 304SS rapidly shifted to a more negative direction. Moreover, the photopotential of TiO_2/304SS electrode showed more negative values with increased film thickness. In conclusion, the photogenerated cathodic protection of 304SS was achieved by the low-temperature LPD-derived TiO_2 film.