物理化学学报2011，Vol.27Issue(4)：905-912,8.
烯胺阻锈剂对钢筋在模拟碳化混凝土孔隙液中的点蚀抑制
Inhibition of Ethyleneamine on the Pitting Corrosion of Rebar in a Synthetic Carbonated Concrete Pore Solution
摘要
Abstract
Tetraethylenepentamine (TEPA) was surveyed to show strong inhibition on pitting corrosion of Q345B carbon steel in a carbonated synthetic pore solution (SPS) by electrochemical noise (ECN),electrochemical impedance spectroscopy (EIS), and polarization curves. Thepitting corrosion potential shifts positively with an increase in the TEPA concentration. ECN data show that the low content of TEPA can increase the nucleation rate of the metastable pits slightly and can effectively reduce their lifespan. The high content (0.10 mol· L-1) of TEPA accelerates the repassivation of metastable pitting and this is accompanied by an increase in noise resistance and a decrease in the nucleation rate and average pitting charge until the noise current transients disappear completely. Both the baseline current and the amplitude of the current transients decrease with an increase in the TEPA concentration, indicating that TEPA retards not only the pitting corrosion but also the general dissolution of the passive film. Micrographs show that the metastable pits mainly initiate and develop around the stable pits because of the induction of corrosion products, which causes the pitting cavity on carbon steel to grow generally in a planar rather than in a perpendicular direction.关键词
碳钢/点蚀/缓蚀剂/混凝土孔隙液/电化学噪声Key words
Carbon steel/ Pitting corrosion/ Inhibitor/ Concrete pore solution/Electrochemical noise分类
化学化工引用本文复制引用
董泽华,朱涛,石维,郭兴蓬..烯胺阻锈剂对钢筋在模拟碳化混凝土孔隙液中的点蚀抑制[J].物理化学学报,2011,27(4):905-912,8.基金项目
国家自然科学基金(50971064)资助项目 （50971064）
