Energy storage ability and anti-corrosion protection properties of TiO2 -SnO2 system

Abstract

TiO 2 /SnO 2 and TiO 2 ―SnO 2 coatings were prepared on type 304 stainless steel by sol-gel method, respectively. TiO 2 /SnO 2 coating is compared with TiO 2 ―SnO 2 coating in terms of energy storage ability and anti-corrosion property. The two coatings can be charged with reductive energy under UV irradiation in 3 wt% aqueous NaCl.The self-discharging time of the TiO 2 /SnO 2 coating is slower than that of the TiO 2 ―SnO 2 coating. The slow discharging may be suitable for an anti-corrosion application for metal. In the case where TiO 2 /SnO 2 coating electrode is electrochemically charged at ―0.38 V (vs. SCE) for 1 h, it can maintain a good cathodic protection for type 304 stainless steel for 7 h in the dark, while the TiO 2 ―SnO 2 coating electrode can only maintain a good cathode protection for 0.5 h in the dark.