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金属学报  2019, Vol. 55 Issue (4): 457-468    DOI: 10.11900/0412.1961.2018.00475
  本期目录 | 过刊浏览 |
SO42-对模拟孔隙液中Q235B钢筋腐蚀行为的影响
李恺强1,杨璐嘉2,徐云泽1(),王晓娜3,黄一1
1. 大连理工大学船舶与海洋工程学院 大连 116024
2. 大连理工大学创新创业学院 大连 116024
3. 大连理工大学物理与光电学院 大连 116024
Influence of SO42- on the Corrosion Behavior of Q235B Steel Bar in Simulated Pore Solution
Kaiqiang LI1,Lujia YANG2,Yunze XU1(),Xiaona WANG3,Yi HUANG1
1. School of Naval Architecture & Ocean Engineering, Dalian University of Technology, Dalian 116024, China
2. School of Innovation and Entrepreneurship, Dalian University of Technology, Dalian 116024, China
3. School of Physics and Optoelectronic Engineering, Dalian University of Technology, Dalian 116024, China
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摘要: 

通过阳极极化曲线、EIS、Mott-Schottky (M-S)以及恒电位极化测量研究了不同pH值模拟混凝土孔隙溶液中SO42-对Q235B钢筋钝化和腐蚀行为的影响。极化曲线测量结果表明,在pH值高于11的模拟孔隙液中,SO42-对Q235B钢的钝化膜没有破坏作用,而在pH值为10的模拟孔隙液中,少量SO42-的存在就会造成Q235B钢表面钝化膜的破裂,从而导致点蚀的萌发。EIS和M-S测量结果表明,碳钢表面的钝化膜在低pH值的模拟孔隙液中稳定性较差并具有更高的缺陷浓度,从而促进了SO42-对碳钢的侵蚀性。结合恒电位极化测试和SEM观测进一步研究了SO42-对碳钢钝化膜的破坏作用。在高pH值的模拟孔隙液中,SO42-在钝化膜的形成阶段能够抑制钝化膜的生长,造成亚稳态点蚀的出现,而在低pH值的模拟孔隙液中,SO42-可以聚集在钝化膜的缺陷处,造成钝化膜的破损和稳态点蚀的发展。

关键词 Q235B钢钝化膜SO42-点蚀    
Abstract

Cl- and SO42- are most common aggressive ions containing in the seawater which may cause the localized corrosion of reinforcement structures. It is found that a protective passive film will form on the steel surface in the concrete pore solution. The localized breakdown of the passive film caused by the aggressive ions and the carbonation are the main reason for the localized corrosion initiation of reinforcements. In the previous studies, it is found that the performances of the SO42- on the rebar corrosion were quite different in different pH value conditions and the test results did not unify. Therefore, the influence of pH value and the SO42- on the corrosion behavior of Q235B carbon steel in the simulated pore solution was studied using anodic polarization, electrochemical impedance spectra (EIS), Mott-Schottky (M-S) and potentiostatic polarization methods. The anodic polarization curves indicate that when the pH value of the simulated pore solution was higher than 11, SO42- had no damage to the passive film. However, once the pH value of the simulated pore solution decreased to 10, a small amount of SO42- can lead to the breakdown of the passive film and induce pitting initiation. EIS and M-S measurement results suggest that the stability of the passive film would decrease with the decreasing of the solution pH. The concentration of the defect would increase in the passive film due to the pH decrease. The stability reduction and the increase of defect concentration both can lead to the passive film become fragile and more easily to be destroyed by SO42-. Through the potentiostatic polarization test in conjunction with SEM observation, it is found that SO42- can inhibit the growth of the passive film during the initial film formation period and lead to the appearance of metastable pitting corrosion under high pH value conditions. In the low pH value conditions, SO42- could accumulate at the defect of the passive film and lead to stable pitting propagate on the steel surface.

Key wordsQ235B steel    passive film    SO42-    pitting corrosion
收稿日期: 2018-10-16     
ZTFLH:  O646  
基金资助:十三五国家科技支撑计划项目(No.2016ZX05057)
通讯作者: 徐云泽     E-mail: xuyunze123@163.com
Corresponding author: Yunze XU     E-mail: xuyunze123@163.com
作者简介: 李恺强,男,1993年生,博士生

引用本文:

李恺强, 杨璐嘉, 徐云泽, 王晓娜, 黄一. SO42-对模拟孔隙液中Q235B钢筋腐蚀行为的影响[J]. 金属学报, 2019, 55(4): 457-468.
Kaiqiang LI, Lujia YANG, Yunze XU, Xiaona WANG, Yi HUANG. Influence of SO42- on the Corrosion Behavior of Q235B Steel Bar in Simulated Pore Solution. Acta Metall Sin, 2019, 55(4): 457-468.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2018.00475      或      https://www.ams.org.cn/CN/Y2019/V55/I4/457

Test groupPre-passivation conditionpH value of thetest solution

SO42- concentration

mol·L-1

ANo pre-passivation12.60
BNo pre-passivation12.60.1
C4 h pre-passivation in pH=12.6 pore solution without SO42-12.60.1
DNo pre-passivation10.00
ENo pre-passivation10.00.1
F4 h pre-passivation in pH=10 pore solution without SO42-10.00.1
表1  恒电位极化测量实验分组情况
图1  不同pH值和不同SO42-浓度的模拟孔隙液中Q235钢的阳极极化曲线
图2  不同pH值模拟孔隙液中Q235B钢的Nyquist图和Bode图
图3  用于阻抗拟合的等效电路图
图4  EIS的主要参数拟合结果
图5  不同pH值模拟孔隙液中Q235B钢的Mott-Schottky测量结果
pHVfb / mVND / (1021 cm-3)
12.6-8082.24
12.0-6852.66
11.0-5123.04
10.0-4103.73
表2  不同pH值模拟孔隙液中M-S曲线拟合结果
图6  表1中A~C组实验中电极表面的电流噪声波动情况
图7  A~C组实验完成后电极的表面形貌SEM像
图8  表1中D~F组实验中电极表面的电流噪声波动情况
图9  D~F组实验完成后电极的表面形貌SEM像
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