TiO2/vanadium pentoxide (V2O5) and TiO2–V2O5 coatings were prepared on type 304 stainless steel substrates via a sol–gel method, respectively. The TiO2/V2O5 coating is compared with the TiO2–V2O5 coating in terms of the photo‐electrochemical performance. The two coatings can be stored with photogenerated electrons under UV irradiation in 3 wt% aqueous NaCl. The self‐discharging time of the TiO2/V2O5 coating is slower than that of the TiO2–V2O5 coating. The slow discharging may be suitable for an anti‐corrosion application for stainless steel. In the case while the two coatings are electrochemically charged under UV irradiation for 1 h, the TiO2/V2O5 coating can maintain a good cathodic protection for type 304 stainless steel for 6 h in the dark, while the TiO2–V2O5 coating can only maintain a good cathode protection for 0.5 h in the dark.
A combined electroless plating and sol-gel method was developed for preparing a NiP/TiO 2 bilayer coating to achieve an especial photocathodic protection effect for A3 low carbon steel. Photocathodic protection properties of the coating were investigated by the electrochemical method. Surface morphology and structure of the coating were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). The results show that the open circuit potential (OCP) of the NiP/TiO 2 coating electrode shifts to À0.42 V under UV irradiation, which is lower than the corrosion potential of A3 low carbon steel. When the light is turned off, the photocathodic protection effect cannot be maintained. In addition, the mechanism of photocathodic protection for the coating was also explored.
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