[1]施锦杰,孙伟.氯离子电迁移下饱和Ca(OH)2中钢筋的锈蚀行为[J].东南大学学报(自然科学版),2010,40(6):1298-1303.[doi:10.3969/j.issn.1001-0505.2010.06.032]
 Shi Jinjie,Sun Wei.Corrosion behavior of steel in saturated Ca(OH)2 solution under chloride ions migration[J].Journal of Southeast University (Natural Science Edition),2010,40(6):1298-1303.[doi:10.3969/j.issn.1001-0505.2010.06.032]
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氯离子电迁移下饱和Ca(OH)2中钢筋的锈蚀行为()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
40
期数:
2010年第6期
页码:
1298-1303
栏目:
材料科学与工程
出版日期:
2010-11-20

文章信息/Info

Title:
Corrosion behavior of steel in saturated Ca(OH)2 solution under chloride ions migration
作者:
施锦杰 孙伟
东南大学江苏省土木工程材料重点实验室,南京 211189
Author(s):
Shi Jinjie Sun Wei
Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing 211189, China
关键词:
钢筋锈蚀 氯离子电迁移 模拟混凝土孔溶液 矿物掺合料 电化学方法
Keywords:
steel corrosion chloride ions migration simulated concrete pore solution mineral admixtures electrochemical methods
分类号:
TU528
DOI:
10.3969/j.issn.1001-0505.2010.06.032
摘要:
利用电迁移加速氯离子在混凝土圆盘试件中传输的方法研究了模拟混凝土孔溶液(饱和Ca(OH)2)中钢筋的锈蚀行为,比较了粉煤灰(FA)、磨细矿渣(GGBS)与硅灰(SF)等矿物掺合料抑制氯离子电迁移及钢筋锈蚀的能力. 采用腐蚀电位法、线性极化法和电化学阻抗谱法测试了钢筋的锈蚀程度,并采用压汞法(MIP)与扫描电子显微镜(SEM)分析了电迁移前后混凝土试件的微结构演变规律. 结果表明,矿物掺合料能有效改善混凝土孔结构,明显降低氯离子电迁移速率与钢筋的腐蚀速率,但不同掺合料抑制钢筋锈蚀的能力有明显差异,由强到弱的规律为:SF>GGBS>FA. 氯离子电迁移作用下饱和Ca(OH)2溶液中钢筋的锈蚀过程可分为3个阶段:钝化阶段、破钝初锈阶段与锈蚀扩展阶段.
Abstract:
The corrosion behavior of steel in simulated concrete pore solution(saturated Ca(OH)2)is investigated by means of the migration of accelerated chloride ions through the concrete disk specimens. The effect of different mineral admixtures, such as fly ash(FA), ground granulate blast-furnace slag(GGBS)and silica fume(SF)on chloride migration resistance and the steel corrosion resistance, are compared. The corrosion states of steel are studied by corrosion potential, linear polarization resistance(LPR)and electrochemical impedance spectroscopy(EIS). The microstructures of concrete specimens before and after migration are analyzed by mercury intrusion porosimetry(MIP)and scanning electron microscopy(SEM). The results show that the mineral admixtures can refine the microstructure of concrete, strongly reduce the migration rate of chloride and corrosion rate of steel. However, their effects are different, being in a sequence of SF>GGBS>FA. The corrosion process in saturated Ca(OH)2 solution can be divided into three stages: passivation, corrosion initiation and corrosion propagation.

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备注/Memo

备注/Memo:
作者简介: 施锦杰(1983—),男,博士生; 孙伟(联系人),女,教授,博士生导师,中国工程院院士,sunwei@seu.edu.cn.
基金项目: 国家重点基础研究发展计划(973计划)资助项目(2009CB623203)、国家高技术研究发展计划(863计划)资助项目(2008AA030794)、东南大学优秀博士学位论文基金资助项目(YBJJ1017).
引文格式: 施锦杰,孙伟.氯离子电迁移下饱和Ca(OH)2中钢筋的锈蚀行为[J].东南大学学报:自然科学版,2010,40(6):1298-1303. [doi:10.3969/j.issn.1001-0505.2010.06.032]
更新日期/Last Update: 2010-11-20