摘要
应用电化学阻抗谱(EIS)和氯离子探针技术,研究在氯化物侵蚀作用下混凝土中钢筋的腐蚀行为.结果表明,钢筋混凝土体系的阻抗谱中包含两个时间常数,分别对应于界面的双电层和钢筋表面的混凝土保护层.自行研制的氯离子探针可连续、无损地测量钢筋/混凝土界面的氯离子浓度.根据腐蚀反应电阻Rct、Warburg阻抗等元件参数和界面氯离子浓度的变化,讨论了混凝土中钢筋腐蚀发生、发展各阶段界面化学环境及钢筋腐蚀参数的变化规律.
Electrochemical impedance spectroscopy (EIS) and chloride sensor were employed to study the corrosion behavior of reinforcing steel in concrete. EIS results indicated that the reinforced concrete system contains two time constants, one derived from electrical double layer of reinforcing steel and the other from concrete layer. The electrical double layer was denoted by a constant phase element other than a capacitor. Ag/AgCl chloride sensor was applied in probing and monitoring the Cl- at steel/concrete interface. A discussion was carried out on the relationship between the electrochemical behavior of rebar and the interfacial chemistry of steel/concrete.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2003年第1期46-50,共5页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(59871043)
福建省自然科学基金(E0210006)资助项目~
关键词
氯离子侵蚀
EIS
钢筋
混凝土
电化学阻抗谱
腐蚀
reinforcing steel
concrete
electrochemical impedance spectroscopy (EIS)
chloride
corrosion
