TiO2光生阴极保护纳米薄膜研究进展

光生阴极保护是一种新型的电化学保护方法,近年来成为腐蚀防护领域的研究热点。TiO_2薄膜具有光生电子-空穴对分离能力优异、稳定性良好、价格低廉等优点,在光生阴极保护技术中具有突出优势。首先介绍了TiO_2薄膜光生阴极保护原理,随后介绍了TiO_2薄膜材料的不同制备方法,包括溶胶-凝胶法、阳极氧化法、水热法、热分解法、电泳沉积法和磁控溅射法等。接着针对目前TiO_2薄膜材料存在的问题,阐述了不同掺杂/复合改性方法,主要有掺杂金属和非金属、表面金属沉积、纳米碳材料复合和半导体复合等。同时,总结了不同TiO_2涂层/金属体系(TiO_2/不锈钢体系、TiO_2/铜体系和TiO_2/碳钢体系等)的光生阴极保护研究进展。最后,对TiO_2光生阴极保护技术今后的发展进行了展望,指出拓展TiO_2薄膜的光吸收范围,提高TiO_2光生电子-空穴对的分离效率,获得高结合力、高耐磨性、抗老化的TiO_2涂层,将是未来光生阴极保护领域的重要发展方向。

TiO2 Nanofilm with Application of Photogenerated Cathodic Protection

Recently, photogenerated cathodic protection, as one of new electrochemical protection methods, has become a research focus in the field of corrosion protection. TiO2 film has outstanding advantages among photogenerated cathodic protection technologies due to excellent electron-hole separating power, good stability, low cost, etc. Photogenerated cathodic protection principle of the TiO2 film was first introduced, and later various preparation methods of the TiO2 film material including sol-gel, anodic oxidation etching, hydrothermal method, thermal decomposition, electrophoretic deposition and magnetron sputtering were presented. For existing problems of the TiO2 film material, different doping/composite modification approaches were illustrated, covering metal/non-metal doping, surface metal deposition, carbon nanomaterial composite and semiconductor composite. Meanwhile, research progress of photogenerated cathodic protection of different TiO2/metal systems was summarized. At last, the outlook was presented for future development of TiO2 photogenerated cathodic protection technology. Major future development trends of photogenerated cathodic protection technology were proposed to be widening light absorption range of TiO2 film, improving electron-hole separation efficiency, and developing high-binding, wear-resistant and aging-resistant TiO2 coating.