不同状态的钢筋在氯离子入侵过程中的腐蚀行为
Corrosion Behavior of Reinforced Steel Bar with Different Surface States in the Progress of Cl- Invasion
摘 要
采用极化曲线技术和扫描电镜结合能谱分析, 对供货状态和打磨光滑状态的钢筋在混凝土氯离子侵蚀过程中的腐蚀行为进行了研究。通过不同浸泡时间, 试样获得了不同的自腐蚀电位及自腐蚀电流密度, 分析了不状态试样的表面形貌。结果表明, 由于钢筋表面状态不同, 钢筋在混凝土中的不同阶段表现出不同的电化学行为。在初期无氯离子的条件下, 不同表面状态的钢筋表面钝化膜的稳定性不同, 而随着氯离子在混凝土中的入侵, 两种钢筋的腐蚀速率也存在很大的差异。结合表面状态分析表明, 供货状态钢筋在混凝土氯离子入侵过程中比打磨光滑状态钢筋更易发生腐蚀。
氯离子
钢筋
表面状态
电化学腐蚀
reinforced steel
chloride ion
concrete
surface state
electrochemical corrosion
Abstract
The corrosion behavior of reinforced steel with different surface states in steel bar immersed in simulated solution containing Cl- was investigated by electrochemical measurements, scanning electron microscopy with energy dispersive X-ray spectrometer (SEM/EDX). The changes of corrosion potential and corrosion current density of reinforced steel with the immersion time were obtained, and the morphology of samples with different surface states was analyzed. The results show that the corrosion behavior of reinforced concrete was different in different immersion stages. The stability of passive film formed on the polished steel was better than that of as-supplied steel at the initial stage was when Cl- did not reach the surface of steel. The corrosion rate of as-supplied steel was larger than that of polished steel with the increase of Cl- ions on the surface of steel due to the rough surface caused by thermal oxidation in manufacture process.
中图分类号 TG171
所属栏目 试验研究
基金项目 国家自然科学基金(50771062); 国家电网重点科研课题(521820130014)
收稿日期 2013/12/3
修改稿日期
网络出版日期
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备注张俊喜(1969-), 教授, 博士, 从事材料腐蚀与防护研究,
引用该论文: LIN De-yuan,DU Ya-li,CHEN Yun-xiang,HONG Yi-cheng,YI Bo,WANG Ling-zhi,ZHANG Jun-xi. Corrosion Behavior of Reinforced Steel Bar with Different Surface States in the Progress of Cl- Invasion[J]. Corrosion & Protection, 2014, 35(10): 982
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参考文献
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【2】王胜年. 我国海港工程混凝土耐久性技术发展及现状[J]. 水运工程, 2010, 31(10): 1-8.
【3】范宏, 付燕弟, 赵铁军, 等. 暴露21年后混凝土的碳化及氯离子侵入研究[J]. 工业建筑, 2011, 41(5): 14-18.
【4】HANSSON C M, POURSAEE A, JAFFER S J. Corrosion of reinforcing bars in concrete[J]. The Master Builder, 2012, 12: 106-124.
【5】WANG Y, LI L Y, PAGE C L. Modeling of chloride ingress into concrete from a saline environment[J]. Building and Environment, 2005, 40: 1573-1582.
【6】李春秋, 李克非. 干湿交替下表层混凝土中氯离子传输: 原理、试验和模拟[J]. 硅酸盐学报, 2010, 38(4): 581-589.
【7】THANGAVEL K, RENGASWAMY N S. Relationship between chloride/hydroxide ratio and corrosion rate of steel in concrete[J]. Cement and Concrete Composites, 1998, 20: 283-292.
【8】ANN K Y, SONG H W. Chloride threshold level for corrosion of steel in concrete[J]. Corrosion Science, 2007, 49: 4113-4133.
【9】THOMAS M. Chloride thresholds in marine concrete[J]. Cement and Concrete Research, 1996, 26(4): 513-519.
【10】NYFAARD P V, GEIKER M R. A method for measuring the chloride threshold level-required to initiate reinforcement corrosion in concrete[J]. Materials and Structures, 2005, 38: 489-494.
【11】DUPART F D R. Reliability of RC beams under chloride ingress[J]. Construction and Building Materials, 2007, 21: 1605-1616.
【12】陈向勇. 带裂缝钢筋混凝土构件的耐久性寿命预测[J]. 福建建筑科技, 2004, 1: 8-9.
【13】STEWART M G, KAT V U. Structural reliability of concrete bridge in cluding improved chloride induced corrosion models[J]. Structural Safety, 2000, 22: 313-333.
【14】俞海勇, 张贺, 王琼, 等. 海工混凝土钢筋锈蚀速率预测模型研究[J]. 建筑材料学报, 2009, 12(4): 478-481.
【15】刘晓敏, 史志明, 许刚, 等. 钢筋在混凝土中腐蚀行为的电化学阻抗特征[J]. 腐蚀科学与防护技术, 1999, 11(3): 161-164.
【16】杜雅莉, 张俊喜, 蒋俊, 等. Cl-浓度渐变的混凝土孔隙液中钢筋的腐蚀过程[J]. 中国腐蚀与防护学报, 2013, 33(4): 331-338.
【17】SONG H W, JUNG M S, LEE C H, et al. Influence of chemistry of chloride ions in cement matrix on corrosion of steel[J]. ACI Materials Journal, 2010, 108(7/8): 332-339.
【18】魏宝明, 储炜, 汪鹰. 混凝土中钢筋的腐蚀与防护[J]. 腐蚀与防护, 1999, 20(2): 56-58.
【19】GLASS G K, BUENFELD N R. The influence of chloride binding on the chloride induced corrosion risk in reinforced concrete[J]. Corrosion Science, 2000, 42(2): 329-344.
【20】吴群, 刘玉, 杜荣归, 等. 氯离子对模拟混凝土孔溶液中钢筋钝性影响的电化学研究[J]. 金属学报, 2008, 44(3): 346-350.
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