Effects of Nano-SiO2 on the Evolution of Impedance Model of Carbon Steels Coated by Nano-SiO2 Modified Epoxy paint
In this paper, the evolution of the impedance model of nano-silicon dioxide modified epoxy coated carbon steels immersed in 3.5％ (wt.％) sodium chloride solution was studied using electrochemical impedance spectroscopy (EIS). It is suggested by EIS spectra that there was only one capacitive semicircle in the impedance spectra in the initial immersion time, which means there was one time constant. However, with the increasing immersion time, different EIS spectra are showed. So, the impedance model is changed. Moreover, during 5-100 days immersion, there is Finite Length Warberg (Wo1) in the impedance model and the diffusion layer stands in the coating. By comparing the evolution of impedance model of nano-silicon dioxide (SiO2) modified epoxy coated carbon steels with that of 200 mesh silicon dioxide modified epoxy coated carbon steels in the given system, it can be seen that, there is no Finite Length Warberg, Wo1, in the impedance model during the whole immersion time. Therefore, is can be deserved that the nano-silicon dioxide particles play an important part during the process of electrolyte diffusing into the coating and the process of corrosion at the surface of the carbon steel matrix.
Impedance model EIS Nano-silicon dioxide 200 mesh silicon dioxide
张秀芝 王福会 杜元龙
中国科学院金属研究所金属腐蚀与防护国家重点实验室,沈阳,110016
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）