A highly ordered TiO2nanotube layer was fabricated by potentiostatic anodization of pure titanium in fluorinated electrolyte solutions.The structure and composition of the as-prepared TiO2 nanotubes were characterized by SEM and XRD.The TiO2 nanotubes show a stronger absorption in the ultraviolet(UV) light range.The performances of photogenerated cathodic protection and the photoelectrochemical response for the TiO2 nanotube layers under illumination and dark conditions were evaluated through the electrochemical measurements.It is found that the open-circuit potentials of 316 SS coupled with the TiO2 nanotubes layers shift negatively under UV light irradiation(λ<380nm).It is indicated that the TiO2 nanotubes arrays are able to function effectively a photogenerated cathodic protection for metals under light illumination and keep the cathodic protection for a long time under dark conditions.


anodic oxidization, TiO2nanotube, photocathodic protection, UV light, mechanism

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