摘要
采用溶胶-凝胶法与浸渍提拉技术在经碱性发黑和热处理后的低碳钢上制备纳米TiO2涂层.通过扫描电子显微镜(SEM)、X射线衍射(XRD)及X射线光电子能谱(XPS)对涂层的结构、形貌及组成进行表征,采用电化学方法研究涂层的防腐蚀性能.结果表明:所制备的纳米TiO2涂层外观呈蓝灰色,表面存在大小不等的微裂纹;XRD分析表明纳米TiO2为锐钛矿型;XPS分析表明涂层主要由Ti、Fe、O和C 4种元素组成;稳定电位和Tafel曲线测试表明纳米TiO2涂层对于低碳钢具有一定的防腐蚀性能,在2.5%NaHCO3溶液中光电化学效应明显,在3%NaC l溶液中光电化学效应不明显.
Nano-sized titanium dioxide coatings were prepared on low carbon steel after alkaline blackening and heat treatment via the sol-gel method. The structure, morphology and composition of the prepared coatings were then characterized by means of SEM, XRD and XPS, and the corrosion resistance of the coatings was investigated via the electrochemical method. SEM results indicate that the coatings look blue-grey with many small size-variable cracks and fractures on the surface, XRD spectra show that the coatings are of the anatase structure, and XPS resuits indicate that the coatings are mainly composed of Ti, Fe, O and C. Moreover, the tested results of stable potential and Tafel curves demonstrate that the nano-sized TiO2 coatings, which protect the low carbon steel from corrosion, are of better photo-electrochemical properties in 2.5% NaHCO3 solution than in 3% NaCl solution.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第7期77-81,共5页
Journal of South China University of Technology(Natural Science Edition)
基金
广东省科技计划项目(2005B16001028)
广州市科技攻关引导项目(055Z108002)
关键词
低碳钢
纳米TIO2
涂层
形貌
光电化学
腐蚀防护
low carbon steel
nano-sized titanium dioxide
coating
morphology
photo-electrochemistry
corrosion protection
