中国腐蚀与防护学报氯离子浓度渐变的混凝土孔隙液中钢筋的腐蚀 .pdf

中国腐蚀与防护学报 Journal of Chinese Society for Corrosion and Protection 1 氯离子浓度渐变的混凝土孔隙液中钢筋的腐蚀过程 杜雅莉，张俊喜，蒋俊，原徐杰，王灵芝，马行驰 (上海电力学院 上海高校电厂腐蚀防护与应用电化学重点实验室，上海，200090) 摘要 采用电化学阻抗谱（EIS ）和线性极化曲线技术研究了供货状态和打磨后的钢筋样品在模拟孔隙液中 氯离子浓度渐变条件下的腐蚀行为。采用扫描电镜结合能谱（SEM /EDX ）和X 射线衍射（XRD ）对钢筋 表面形貌和组成结构作了分析。结果表明：在氯离子浓度逐渐增加的孔隙液中，钢筋表面的电化学行为基 本可分为三个过程，即钝化膜形成或修复过程、氯离子侵蚀过程和钙沉积过程。供货状态钢筋比打磨后的 钢筋样品更容易发生腐蚀。结合电极的腐蚀电位、腐蚀电流和电化学阻抗等参数随氯离子浓度的变化，讨 论了混凝土中钢筋腐蚀发生、发展各阶段的腐蚀电化学过程的变化规律。 关键词 混凝土；氯离子；锈蚀；钢筋；电化学测试 中图分类号：TG171 文献标识码：A 文章编号：1005-4357(2010)xx-0000-00 Corrosion Behavior of Reinforced Steel in Simulated Pore Solution with Gradual Augment of Cl- Ions Du Yali, Zhang Junxi, Jiang Jun, Yuan Xujie, Wang Lingzhi, Ma Xingchi (Key Laboratory of Shanghai Colleges and Universities for Electric Power Corrosion Control and Applied Electrochemistry, Shanghai University of Electric Power, Shanghai 200090, China) Abstract: The corrosion behavior of reinforced steel with different surface states in simulated pore solution with gradual augment of Cl- ions was investigated by using electrochemical measurements, scanning electron microscopy with energy dispersive X-ray spectrum (SEM/EDX) and X-ray diffraction (XRD). The variation of corrosion potential and corrosion current density of the reinforced steel with corrosion time was obtained, and the morphology and structure of corrosion products formed on the sample were analyzed. The results showed that the reinforced steel with different surfaces state had different corrosion characterizations; the corrosion process of reinforced steel cmight include three steps, i.e., the formation of passive film, the aggression of Cl- ions and the calcium deposition. It is more easy to happen corrosion for reinforced steel with