饱和NaCl溶液浸泡下混凝土试块中有机阻锈剂对钢筋腐蚀行为的影响

doi:10.3866/PKU.WHXB20100905

物理化学学报 >> 2010, Vol. 26 >> Issue (09): 2354-2360.doi: 10.3866/PKU.WHXB20100905

饱和NaCl溶液浸泡下混凝土试块中有机阻锈剂对钢筋腐蚀行为的影响

郑雷刚, 杨怀玉

中国科学院金属研究所, 金属腐蚀与防护国家重点实验室,沈阳110016

收稿日期:2010-03-29 修回日期:2010-05-21 发布日期:2010-09-02
通讯作者: 杨怀玉 E-mail:hyyang@imr.ac.cn
基金资助:
国家科技支撑计划(2007BAB27B03)资助项目

Influence of Organic Inhibitors on the Corrosion Behavior of Steel Rebar insideMortar Specimens Immersed in Saturated NaCl Solution

ZHENG Lei-Gang, YANG Huai-Yu

State key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, P. R. China

Received:2010-03-29 Revised:2010-05-21 Published:2010-09-02
Contact: YANG Huai-Yu E-mail:hyyang@imr.ac.cn
Supported by:
The project was supported by the National Key Technology R&DProgram, China (2007BAB27B03).

摘要/Abstract

摘要：

利用电化学阻抗谱(EIS)、半电池腐蚀电位(E_corr)和宏观电池腐蚀电流密度(I_corr)测量技术, 在饱和NaCl 溶液浸泡的硬化混凝土试块中, 研究了4 种醇胺基阻锈剂对钢筋电极腐蚀电化学行为的影响和长期阻锈性能. 在浸泡初始的100 d内, 与空白样相比, 添加阻锈剂后钢筋电极腐蚀电位升高, 阻抗膜值增大, 腐蚀电流密度值降低,表明电极表面处于钝态, 阻锈剂表现出良好的阻锈性能. 随浸泡时间延长,电极腐蚀电位和阻抗膜值下降, 腐蚀电流密度增大. 浸泡后期, 除添加醇胺基CI-4样外, 电极电位和腐蚀电流密度与空白样相比无明显差别, 表明电极由钝态转变为活性腐蚀状态.但添加CI-4 样品, 钢筋电极始终保持在钝化状态, 阻锈性能最好. 基于阻锈剂与Cl^-间的竞争吸附, 分析探讨了可能的阻锈机理.

关键词: 阻锈剂, 钢筋防护, Cl^-诱导的局部腐蚀, 电化学技术

Abstract:

The long-term effects of four kinds of amine-alcohol based inhibitors on the corrosion behavior of steel rebar inside mortar specimens immersed in saturated NaCl solution were studied by electrochemical impendence spectroscopy (EIS), half cell corrosion potential (E_corr), and macrocell corrosion current density (I_corr) measurements. We found that the E_corr and the impedance modulus were higher than those in the control specimen after inhibitor addition. Additionally, I_corr decreased over the initial 100 d of immersion revealing that the steel rebar electrodes are kept in passive state and the inhibitors showed good inhibition effects. With an increase in the immersion time, E_corr and the impedance modulus for all the inhibited mortar specimens decreased while I_corr increased. After immersion for 125 d there were no obvious differences between E_corr and I_corr for the inhibited systems by comparison to those in the blank sample, except for the specimen containing CI-4. This suggests that the surface of the electrode changes from passive state to active state. The best inhibition was obtained in the presence of the CI-4 inhibitor. We briefly discuss the inhibition mechanismbased on the competitive adsorption of the inhibitor molecules with Cl^- on the steel rebar surface.

Key words: Corrosion inhibitor, Protection of steel rebar, Local corrosion induced by Cl-, Electrochemical technique

郑雷刚, 杨怀玉. 饱和NaCl溶液浸泡下混凝土试块中有机阻锈剂对钢筋腐蚀行为的影响[J]. 物理化学学报, 2010, 26(09), 2354-2360. doi: 10.3866/PKU.WHXB20100905

ZHENG Lei-Gang, YANG Huai-Yu. Influence of Organic Inhibitors on the Corrosion Behavior of Steel Rebar insideMortar Specimens Immersed in Saturated NaCl Solution[J]. Acta Phys. -Chim. Sin. 2010, 26(09), 2354-2360. doi: 10.3866/PKU.WHXB20100905

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB20100905

https://www.whxb.pku.edu.cn/CN/Y2010/V26/I09/2354

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饱和NaCl溶液浸泡下混凝土试块中有机阻锈剂对钢筋腐蚀行为的影响

Influence of Organic Inhibitors on the Corrosion Behavior of Steel Rebar insideMortar Specimens Immersed in Saturated NaCl Solution

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