环氧涂层钢筋涂层破损情况的电化学阻抗研究  

EIS study on coating damage of epoxy-coatings rebars

作　　者：汤雁冰[1,2] 徐云浦 王迎飞[1] 熊建波[1] 范志宏[1] 

机构地区：[1]中交四航工程研究院有限公司水工构造物耐久性技术交通行业重点实验室,广东广州510230 [2]河海大学力学与材料学院,江苏南京210098

出　　处：《水运工程》2015年第5期40-43,50,共5页Port & Waterway Engineering

摘　　要：采用电化学阻抗技术研究有无破损的环氧涂层钢筋在混凝土中的阻抗谱特征。结果表明:在所研究的周期内,无破损的环氧涂层钢筋的阻抗谱只有1个时间常数,该时间常数反映的是钢筋表面环氧涂层的信息,随着时间的延长,混凝土中的孔隙水不断向环氧涂层内部扩散,使得涂层的电阻减小、电容增大,涂层保护效果略变差;发生破损的环氧涂层钢筋有2个时间常数,分别反映的是钝化膜的信息和钢筋表面电化学反应的信息。采用电化学阻抗技术能够方便快捷地判断出环氧涂层钢筋的涂层破损情况,为环氧涂层钢筋涂层破损情况的无损检测提供了技术支撑。The destructive status of epoxy-coatings on rebar is investigated by the electrochemical spectroscopy. The results show that there is only one time constant while the epoxy-coatings are non-destructive. The time constant reflects the characteristics of epoxy-coatings. The resistance decreases and the capacity increases with the increase of time due to the water in concrete pore penetration into epoxy-coatings. There are two time constants while the epoxy-coatings are destructive. They reflect the characteristics of passive film and electrochemical reaction. The EIS could conveniently and quickly differentiate the destructive status of epoxy-coatings on rebar. It is a useful test method for in-situ and unwounded test the destructive status of epoxy-coatings on rebar in concrete structures. It provides technical support for nondestructive examination of epoxy-coating reinforcement in concrete structures.

关 键 词：电化学阻抗 环氧涂层钢筋 涂层破损 无损检测 

分 类 号：TQ15[化学工程—电化学工业]