刘明，程学群，李晓刚，金柱，刘海霞，赵瑞涛

（北京科技大学腐蚀与防护中心， 北京 100083）

　　摘要：应用动电位极化、电化学阻抗谱、Mott-Schottky、恒电位极化和浸泡实验的方法研究了HRB400钢筋在含0.1%NaCl饱和Ca（OH）2混凝土模拟孔隙溶液中的点蚀性能。结果表明：随着溶液温度的升高，HRB400钢筋的自腐蚀电位负移，腐蚀电流密度增大，点蚀电位降低，钝化膜阻抗降低。HRB400钢筋的半导体类型和性质在不同温度下发生改变。HRB400钢筋发生点蚀的孕育期随着温度的升高而缩短，点蚀敏感性增加。随着温度的升高，HRB400钢筋的均匀腐蚀速率增大，但在较高温度下钢筋表面出现了明显的点蚀坑。

　　关键词：动电位极化；电化学阻抗谱；钝化膜；点蚀；浸泡实验

Influence of temperature on pitting corrosion resistance of HRB400 steel rebar in simulated concrete pore solution in presence of Cl^-

Liu Ming,Cheng Xuequn,Li Xiaogang,Jin Zhu,Liu Haixia,Zhao Ruitao

（Corrosion and protection center of University of Science and Technology Beijing,Beijing 100083）

　　Abstract: The electrochemical behaviors of a HRB400 steel rebar specimens were studied by potentiodynamic polarization, electrochemical impendence spectroscopy, Mott-Schottky, constant potential polarization and immersion test in Ca（OH）2 saturated solution containing 0.1%NaCl. The results showed that with the increase of the temperature, open-circuit corrosion potential and pitting corrosion potential decreased, corrosion current density increased, the impedance of passive film decreased. The semi-conductive styles and properties of passive film changed at different temperatures. Also the pregnancy time of pitting shortened and the sensitivity of pitting increased remarkably as the temperature increased. In addition, with the increase of temperature, the uniform corrosion rate of HRB400 steel increased,  serious pitting corrosion appeared on the surface of the samples at higher temperatures.

　　Key words:The potentiodynamic polarization;Electrochemical impedance spectroscopy; passivation film; pitting corrosion; immersion test

　　联系方式

　　刘明：liuming870313@stu.xjtu.edu.cn