TiO2纳米管阵列光生阴极保护性能研究进展

TiO2纳米管阵列因具有比表面积大、电子传输能力强、化学稳定性好等特点,以及拥有优势明显的光生阴极保护作用,可以为金属基体提供有效的腐蚀防护,近年来成为了研究的热点之一。为了探索TiO2纳米管阵列在金属防腐蚀方面的应用,就其对不锈钢和碳钢的保护作用以及改性方式对TiO2纳米管阵列的光生阴极保护的延时效果进行了总结,并比较分析了TiO2纳米管阵列对两类钢保护效果的差异,指出了纳米管阵列对碳钢的保护效果不及对不锈钢的保护,其不佳的主要原因是阵列与碳钢基体间的结合强度较低且受界面层结构和电子特性的影响。同时,由于TiO2属于宽禁带半导体材料,对可见光的利用率比较低且当TiO2受到光激发后产生的电子-空穴对的存在时间较短,需要利用不同改性方法来提高光生阴极保护效果,因此对其金属离子掺杂、非金属掺杂、半导体复合、贵金属沉积以及石墨烯复合五种主要改性的研究进展进行了着重阐述,对影响改性效果的主要因素以及相应的改性机理也进行了归纳与分析,并根据当前的研究现状,提出了有待进一步研究和探索的问题,以期为TiO2纳米管阵列获得优良的阴极保护作用提供思路。

Study Progress on Photocathodic Protection Property of TiO2 Nanotube Array

In recent years, TiO2 nanotube array has become one of the research hotspots due to its large specific surface area, strong electron transport capability, good chemical stability and photocathodic protection ability with obvious advantage to provide effective anti-corrosion protection for metal substrates. In order to explore the applications of TiO2 nanotube array in metal corrosion protection, its protection for stainless steel and carbon steel and the effect of modification method on its delay effect of photocathodic protection were reviewed. The difference of protection effect of TiO2 nanotube array for the two types of steel was compared and analyzed. It is pointed out that the protection effect of nanotube array for carbon steel is not as good as that for stainless steel, which mainly results from the low bonding strength between the array and the carbon steel matrix and the effects of structure and electronic properties of interfacial coating. Due to wide band gap, the utilization rate of visible light of TiO2is relatively low. Moreover, the photo generated electron-hole pairs of TiO2 have a short life. Different modification methods are needed to improve its photocathodic protection effect. So research progress on improving photocathodic protection effect of TiO2 nanotube arrays by five main modification methods such as metal ion doping, non-metal doping, semiconductor recombination, precious metal deposition and graphene composite modification was also elaborated respectively, the main factors affecting the modification effect and the corresponding modification mechanism were also summarized and analyzed. According to the current research status, the problems to be further studied and explored were proposed. Wish to provide ideas of obtaining excellent cathodic protection effect for TiO2 nanotube array.