| 摘要: |
| 应用动电位极化、电化学阻抗谱（EIS）、Mott Schottky曲线、恒电位极化和浸泡方法研究了HRB400钢筋在NaCl质量分数为01%的饱和Ca（OH）2模拟混凝土孔隙液中的点蚀性能.结果表明：随着模拟液温度的升高，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；发生点蚀的孕育期缩短，点蚀敏感性增加；均匀腐蚀速率增大且其表面在较高的温度下出现了明显的点蚀坑；在不同模拟液温度下，HRB400钢筋的半导体类型和性质发生了改变. |
| 关键词: 动电位极化 电化学阻抗谱 钝化膜 点蚀 浸泡 |
| DOI：10.3969/j.issn.1007 9629.2015.06.015 |
| 分类号: |
| 基金项目:国家重点基础研究发展计划（973计划）项目（2014CB643300）；国家科技基础条件平台建设项目 |
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| Influence of Temperature on Pitting Corrosion of Steel Rebar in Simulated Concrete Pore Solution |
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LIU Ming1, CHENG Xuequn1, LI Xiaogang1, JIN Zhu1, LIU Haixia1, GAO Xin2
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1.Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China;2.Research Institute of Metallurgy Engineering, University of Science and Technology Beijing, Beijing 100083, China
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| Abstract: |
| The electrochemical behaviors of HRB400 steel rebar specimens were investigated by potentiodynamic polarization, electrochemical impendence spectroscopy（EIS）, Mott Schottky curve, constant potential polarization and immersion test in Ca（OH）2 saturated solution containing 01%(by mass) NaCl. The results show that with the increase of the solution temperature, corrosion potential and pitting corrosion potential decrease, corrosion current density increases, the impedance of passive film decreases. The semi conductive styles and properties of passive film change at different solution temperatures. The pregnancy time of pitting corrosion is shortened and the sensitivity of pitting corrosion increases remarkably as the solution temperature increases. In addition, with the increase of solution temperature, the uniform corrosion rate of HRB400 steel rebar increases, serious pitting corrosion appeares on the surface of the specimens at higher solution temperatures. |
| Key words: potentiodynamic polarization electrochemical impedance spectroscopy(EIS) passive film pitting corrosion immersion |
