ノート
Application of the photoeffect in TiO2 for cathodic protection of copper
2004 年 72 巻 12 号 p. 880-884
詳細
2004 年 72 巻 12 号 p. 880-884
Photoelectrochemical characterization of copper specimens coated with a bilayer photoanode bearing the configuration Cu | Sb-SnO2 | SnO2 + TiO2 was carried out for verifying the suitability of such coatings for a cathodic protection of copper in presence of ultraviolet illumination. An optimization of the heat-treatment temperature of the coatings was accomplished which showed that a 200°C heat treatment was sufficient to obtain a desirable photoeffect. The results of the present investigation also showed that such bilayer photoanodes are functional for cathodic protection applications in the case of copper only under conditions of low oxygen potentials. A continued cathodic protection was possible even after cessation of ultraviolet illumination due to a charge storage of the photogenerated electrons transferred from TiO2 to SnO2, which could be slowly released to the metal substrate continuing to offer a cathodic protection under no illumination conditions.
