The study of under deposit corrosion of carbon steel in the flowback water during shale gas production
The study of under deposit corrosion of carbon steel in the flowback water during shale gas production
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DOI：
10.1016/j.apsusc.2020.146534
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发表时间：
2020-09
影响因子：
6.7
通讯作者：
Qinglian Xiong;Junying Hu;Chenrong Gu;Min Feng;Zhi Zhang;X. Zhong
中科院分区：
文献类型：
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作者：
Qinglian Xiong;Junying Hu;Chenrong Gu;Min Feng;Zhi Zhang;X. Zhong
在页岩气返排水环境中，会发生严重的存款下腐蚀。采用丝束电极、动电位极化曲线、电化学阻抗谱、扫描电镜、X射线衍射和X射线光电子能谱研究了Q235碳钢在模拟含CO2/O2页岩气返排水中的存款下腐蚀行为。结果表明，镀层覆盖电极与裸电极之间存在电偶腐蚀效应。沉积物覆盖的电极和裸电极的极性在3 h时反转。在浸泡3 h前，沉积物覆盖电极作为阴极，裸电极作为阳极。但浸渍3 h后，镀层覆盖电极变为阳极，裸电极变为阴极。存款下的局部腐蚀特征明显，腐蚀产物主要由Fe 2 O3、Fe 3 O 4和FeCO 3组成。WBE可用于现场监测存款下局部腐蚀的发生和发展。WBE电流图表明，存款覆盖的电极发生了严重的局部腐蚀。
Serious under deposit corrosion could occur in the shale gas flowback water environment. In this work, under deposit corrosion of Q235 carbon steel in a simulated CO2/O2-containing shale gas flowback water was studied using wire beam electrode, potentiodynamic polarization curves, electrochemical impedance spectroscopy, scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The results show that there is a galvanic corrosion effect between the deposit-covered electrode and bare electrode. The polarity of the deposit-covered electrode and bare electrode is reversed at 3 h. Before 3 h immersion, deposit-covered electrode acts as cathode and bare electrode acts as anode. However, after 3 h immersion, deposit-covered electrode turns into anode while bare electrode converts into cathode. The obvious localized corrosion characteristics can be observed under deposit and the corrosion products mainly consist of Fe2O3, Fe3O4and FeCO3. WBE can be used to in situ monitor the occurrence and development of local corrosion under deposit. The current maps of WBE show that severe local corrosion has occurred on the electrodes covered by deposit.