Electrochemical noise analysis of cathodically protected steel reinforcement in concrete using carbon fiber sheet as anode
Electrochemical noise analysis of cathodically protected steel reinforcement in concrete using carbon fiber sheet as anode
复制标题
以碳纤维片为阳极的混凝土中阴极保护钢筋的电化学噪声分析
DOI：
10.1016/j.conbuildmat.2021.125474
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发表时间：
2021-12
影响因子：
7.4
通讯作者：
Li Shan
中科院分区：
文献类型：
--
作者：
Hu Jiyue;Wang Siyu;Lu Yiyan;Li Shan
利用电化学噪声技术对混凝土中钢筋的外加电流阴极保护（ICCP）效果进行了研究，并分析了其机理。考虑的变量包括保护方法（非保护，ICCP）和ICCP的电流密度（30 mA/m2，90 mA/m2）。在ICCP的情况下，由于其良好的电化学性能和耐久性，碳纤维板被用作阳极。在120 d的暴露期内，每隔30 d测量一次混凝土中钢筋的电化学电位噪声（EPN）和电化学电流噪声（ECN），并从时域和频域的角度进行分析。结果表明，电流密度为30 mA/m2的ICCP处理后，ECN信号的波动变小，抗噪性Rn提高，ECN信号的低频平台WLin功率密度图（PSD）减小。这表明钢的腐蚀得到了缓解。而电流密度为90 mA/m2的试样则相反，为过保护，可能发生氢腐蚀。与未保护的试样相比，经30 mA/m2 ICCP处理的试样d1-d3小波晶体的能量比例明显增加。此外，随着处理时间的增加，d1-d3小波晶体的能量比例增加。这说明ICCP抑制全面腐蚀比抑制点蚀更有效。应特别注意经ICCP（即极化）处理的样品的EPN信号，因为EPN信号可能由于去极化不足而有害地表现出更大的波动。建议用ECN信号代替EPN信号来分析ICCP试样的腐蚀行为。
This paper presents an efficiency and mechanism analysis of impressed current cathodic protection (ICCP) for corroded steel reinforcements in concrete by means of electrochemical noise (EN), which is an advanced technique that allows real-time monitoring without any disturbance. The considered variables include protection method (non-protection, ICCP) and current density of ICCP (30 mA/m2, 90 mA/m2). In the cases of ICCP, carbon fiber sheet is adopted as the anode thanks to its good electrochemical properties and durability. Electrochemical potential noise (EPN) and electrochemical current noise (ECN) of steel reinforcement in concrete are measured every 30 d during the 120-d exposure period and analyzed from the perspectives of time and frequency domains. The results show that ICCP treatment with a current density of 30 mA/m2leads to slighter fluctuations in ECN signals, an improvement in noise resistanceRn, and decreases in the low frequency plateauWLin power density diagram (PSD) of ECN signals. It indicates that the corrosion of steel is alleviated. However, the results of the specimen protected with a current density of 90 mA/m2are the opposite, which is overprotected and hydrogen corrosion may happen. Compared to the specimen with no protection, the specimen treated with 30 mA/m2ICCP shows an evident increase in energy proportion of d1-d3 wavelet crystals. Additionally, with increasing the treatment duration, the energy proportion of d1-d3 wavelet crystals increases. This illustrates that ICCP is more effective in inhibiting general corrosion than pitting corrosion. Extra caution should be paid to EPN signals of specimens subjected to ICCP, namely polarization, because EPN signals may anomalously exhibit severer fluctuations as a result of insufficient depolarization. It is suggested to use ECN signals instead of EPN signals to analyze the corrosion behavior of specimens subjected to ICCP.
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影响因子：
5.5
作者：
Dawei Zhang;Yu-Xi Zhao;T. Ueda;Xiangmin Li;Qingfeng Xu
通讯作者：
Dawei Zhang;Yu-Xi Zhao;T. Ueda;Xiangmin Li;Qingfeng Xu
影响因子：
1.2
作者：
Da-Hai Xia;Y. Behnamian
通讯作者：
Da-Hai Xia;Y. Behnamian
影响因子：
1.6
作者：
J. Uruchurtu;J. Dawson
通讯作者：
J. Uruchurtu;J. Dawson
DOI：
10.1186/s40069-018-0234-y
发表时间：
2018-12
影响因子：
3.4
作者：
Faiz Shaikh
通讯作者：
Faiz Shaikh
影响因子：
7.4
作者：
Danqian Wang;Miao Wu;Jing Ming;Jinjie Shi
通讯作者：
Danqian Wang;Miao Wu;Jing Ming;Jinjie Shi