等效电路拟合珊瑚混凝土中钢筋锈蚀行为的电化学阻抗谱研究

doi:10.11902/1005.4537.2018.108

中国腐蚀与防护学报

2019, Vol. 39

Issue (3): 260-266 DOI: 10.11902/1005.4537.2018.108

研究报告

本期目录 | 过刊浏览

等效电路拟合珊瑚混凝土中钢筋锈蚀行为的电化学阻抗谱研究

达波,余红发(

),麻海燕,吴彰钰

南京航空航天大学土木工程系南京 210016

Equivalent Electrical Circuits Fitting of Electrochemical Impedance Spectroscopy for Rebar Steel Corrosion of Coral Aggregate Concrete

Bo DA,Hongfa YU(

),Haiyan MA,Zhangyu WU

Department of Civil Engineering, Nanjing University of Aeronautic and Astronautic, Nanjing 210016, China

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摘要:

采用电化学阻抗谱法 (EIS)，通过测试不同暴露时间珊瑚混凝土 (CAC) 中钢筋的Nyquist图和Bode阻抗模图，探索了适用于拟合CAC中钢筋腐蚀行为的等效电路 (EEC) 模型，建立了电荷转移电阻 (R_ct) 与极化电阻 (R_p) 的转换关系，探讨了保护层厚度和钢筋种类对CAC中钢筋耐蚀性能的影响。结果表明：适用于CAC中钢筋腐蚀行为的EEC模型电路编码分别为：钝化阶段R_s(C_cR_c)(Q_dlR_ct) 和锈蚀阶段R_s(C_cR_c)(Q_dl(R_ctW))。随着保护层厚度的增大，钢筋的R_p逐渐增大，即钢筋的耐蚀性能逐渐增强。此外，CAC中不同种类钢筋的耐腐蚀性能规律为：2205双相不锈钢＞316不锈钢＞有机新涂层钢筋＞锌铬涂层钢筋＞普通钢筋。因此，为了延长岛礁CAC结构的服役寿命，建议采用有机新涂层钢筋、保护层厚度至少为5.5 cm。

关键词 ：珊瑚混凝土, 钢筋锈蚀, 电化学阻抗谱法, 等效电路, 保护层厚度, 钢筋种类

Abstract：

Nyquist plots and Bode impedance module plots of rebar steel in coral aggregate concrete (CAC) exposed in artificial sea water for different times were assessed by means of electrochemical impedance spectroscopy (EIS). The suitable equivalent electric circuit (EEC) for fitting data of the rebar steel corrosion in CAC was proposed. The conversion relationship between charge transfer resistance (R_ct) and polarization resistance (R_p) was established. The influence of the thickness of concrete cover and the rebar steel types on the corrosion behavior of rebar steel in CAC was discussed. The results show that: the EEC mode for the rebar steel electrode in CAC were R_s(C_cR_c)(Q_dlR_ct) in the passivation stage and R_s(C_cR_c)(Q_dl(R_ctW)) in the corrosion stage respectively. As the thickness of concrete cover increased, the R_ct of rebar steel gradually increased, as did the corrosion resistance. Moreover, the corrosion resistance of different rebar steels decreases as the following sequence: 2205 duplex stainless steel ＞316 stainless steel ＞new organic coated steel ＞zinc-chromium coated steel ＞common steel. Therefore, for CAC structures in actual engineering practice, it was suggest to adopt new organic coated steel, while the thickness of concrete cover should be thicker than 5.5 cm, which could prolong the initial stage of rebar steel corrosion, reduce the corrosion rate and prolong the service life of the CAC structure.

Key words： coral aggregate concrete reinforcement corrosion electrochemical impedance spectroscopy method equivalent electric circuit concrete cover thickness reinforcement types

收稿日期: 2018-07-31

ZTFLH:

TU528

基金资助:国家自然科学基金(51508272);国家自然科学基金(51678304);国家自然科学基金(51878350);国家自然科学基金(11832013);江苏省自然科学基金(BK20180433);中国博士后科学基金(2018M630558)

通讯作者: 余红发 E-mail: yuhongfa@nuaa.edu.cn

Corresponding author: Hongfa YU E-mail: yuhongfa@nuaa.edu.cn

作者简介: 达波，男，1988年生，博士

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引用本文:

达波,余红发,麻海燕,吴彰钰. 等效电路拟合珊瑚混凝土中钢筋锈蚀行为的电化学阻抗谱研究[J]. 中国腐蚀与防护学报, 2019, 39(3): 260-266.
Bo DA, Hongfa YU, Haiyan MA, Zhangyu WU. Equivalent Electrical Circuits Fitting of Electrochemical Impedance Spectroscopy for Rebar Steel Corrosion of Coral Aggregate Concrete. Journal of Chinese Society for Corrosion and protection, 2019, 39(3): 260-266.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2018.108 或 https://www.jcscp.org/CN/Y2019/V39/I3/260

表1 钢筋的化学成分

表2 CAC的试块编号

图1 等效电路模型EEC1

图2 等效电路模型EEC2

图3 等效电路模型EEC3

图4 不同等效电路拟合得到的Rct与Rp之间的关系

表3 Rp、Rct与钢筋锈蚀速率之间的关系

图5 不同等效电路模型拟合的Nyquist图

表4 不同模型测得的Rct与Rp对比

图6 CAC中不同种类钢筋的EIS谱

图7 不同保护层厚度CAC中有机新涂层钢筋的EIS谱

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