摘要
用电化学阻抗谱(EIS)方法研究了混凝土钢筋浸泡在氯离子溶液中的阻抗谱特征,研究结果表明:浸泡初期,钢筋电化学阻抗谱为一半径很大的容抗弧,钢筋处于钝化状态;随着腐蚀的发展,钢筋的阻抗谱表现为双容抗弧,钢筋表面的钝化膜已破裂,钢筋发生了孔蚀,其腐蚀过程受电荷传递过程控制;在浸泡后期,阻抗谱低频段出现了Warburg阻抗,钢筋腐蚀转变为扩散过程控制。随着浸泡时间的延长,钢筋的电荷转移电阻减小,腐蚀速率增加。
Electrochemical impedance spectroscopy（EIS） characteristics of the steel in concrete in environment containing chloride ion were studied by means of EIS. The results indicated that EIS of the steel was a capacitive loop in the early stage of immersion, showing that the steel was in the passive state indicating and the control step of corrosion was the charge transfer process. Along with the development of eorrosion, EIS consisted of two eapaeitive arcs, indica- ting that the passive film in surface of steel rebar was broken down and pitting corrosion happened. At the late stage of immersion, a Warburg impedanee at low frequency region was observed, which implied that the control step was the dif fusion-controlled process. The eharge transfer resistance decreased and the corrosion rate of the steel increased with the increasing of immersion time.
出处
《表面技术》
EI
CAS
CSCD
北大核心
2011年第3期65-67,84,共4页
Surface Technology
基金
贵州省教育厅自然科学研究重点资助项目(黔教科20090050)
贵州省科学技术基金资助项目(黔科合J字[2008]2008号)
