高剪切力流场下X80管线钢局部腐蚀深坑诱导局部湍流交互机理研究

doi:10.11949/0438-1157.20201046

化工学报 ›› 2021, Vol. 72 ›› Issue (4): 2203-2212.DOI: 10.11949/0438-1157.20201046

高剪切力流场下X80管线钢局部腐蚀深坑诱导局部湍流交互机理研究

谭卓伟¹(),杨留洋²,王振波¹,豆肖辉²,张大磊²(),张明阳³,金有海¹

^1.中国石油大学（华东）新能源学院，山东青岛 266580
^2.中国石油大学（华东）材料科学与工程学院，山东青岛 266580
^3.山东建筑大学热能工程学院，山东济南 250101

收稿日期:2020-09-27 修回日期:2020-10-12 出版日期:2021-04-05 发布日期:2021-04-05
通讯作者: 张大磊
作者简介:谭卓伟（1990—），男，博士研究生，tanzhuowei1990@126.com
基金资助:
国家自然科学基金项目(51774314);山东省自然科学基金项目(ZR2018MEM002);中央高校基础研究基金项目(19CX05001A)

Study on interaction mechanism of local turbulent flow induced by local corrosion of X80 pipeline steel in high shear flow field

TAN Zhuowei¹(),YANG Liuyang²,WANG Zhenbo¹,DOU Xiaohui²,ZHANG Dalei²(),ZHANG Mingyang³,JIN Youhai¹

^1.College of New Energy, China University of Petroleum (East China), Qingdao 266580, Shandong, China
^2.School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao 266580, Shandong, China
^3.School of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, Shandong, China

Received:2020-09-27 Revised:2020-10-12 Online:2021-04-05 Published:2021-04-05
Contact: ZHANG Dalei

摘要/Abstract

摘要：

天然气管道内表面局部腐蚀缺陷会诱发局部流场突变影响局部腐蚀进程，利用高剪切力的冲刷腐蚀实验装置进行流动状态下的电化学腐蚀在线测试，研究了局部腐蚀深坑对局部腐蚀进程的影响。试样在冲刷腐蚀过程中的界面腐蚀电化学信号通过电化学阻抗谱进行分析，腐蚀产物膜的成分及特征通过扫描电子显微镜（SEM）、能量衍射谱图（EDS）以及X射线衍射（XRD）表征，并结合计算流体力学（CFD）分析了流场参数对腐蚀传质过程的影响。结果表明，表面缺陷会诱导局部位置流场发生变化，增强局部位置的传质作用，缺陷表面腐蚀产物也因此随着流速的变化而呈现不同的微观形态。在较高强度流场下，局部增强的壁面剪切力会剥离部分致密腐蚀产物膜，导致测试表面形成大阴极小阳极的电化学分布，促进局部位置的腐蚀进程，从而加速局部腐蚀发生。

关键词: 流场, 局部腐蚀坑, 腐蚀产物膜, 传质过程

Abstract:

Local corrosion defects on the inner surface of natural gas pipelines will induce sudden changes in the local flow field and affect the local corrosion process. The high-shear stress corrosion test device is used to conduct on-line electrochemical corrosion testing under the flow, and the influence of local corrosion pits on the local corrosion process is studied. The interfacial corrosion electrochemical signal of the specimens during the corrosion process is analyzed by electrochemical impedance spectroscopy (EIS). The composition and characteristics of the corrosion scale are characterized by scanning electron microscope (SEM),energy diffraction spectrum (EDS) and X-ray diffraction(XRD). The influence of flow field parameters on the corrosion mass transfer process is calculated and analyzed. The results show that surface defects will induce changes in the flow field and enhance the mass transfer at local locations. Therefore, the corrosion scale on the surface will show different microscopic forms with the change of flow velocity. In a high-intensity flow field, the locally enhanced wall shear stress will peel off part of the dense corrosion product film, resulting in the formation of electrochemical distribution of large cathodes and small anodes on the test surface, which promotes the corrosion process at local locations and accelerates the occurrence of local corrosion.

Key words: flow field, local corrosion pit, corrosion scale, process of mass transfer

中图分类号:

TE 832

谭卓伟, 杨留洋, 王振波, 豆肖辉, 张大磊, 张明阳, 金有海. 高剪切力流场下X80管线钢局部腐蚀深坑诱导局部湍流交互机理研究[J]. 化工学报, 2021, 72(4): 2203-2212.

TAN Zhuowei, YANG Liuyang, WANG Zhenbo, DOU Xiaohui, ZHANG Dalei, ZHANG Mingyang, JIN Youhai. Study on interaction mechanism of local turbulent flow induced by local corrosion of X80 pipeline steel in high shear flow field[J]. CIESC Journal, 2021, 72(4): 2203-2212.

图/表 15

图1 冲刷腐蚀实验装置示意图1—气压表；2—气体主阀；3—气瓶；4—气体流量计；5—气体流量控制阀；6—冷却水出口；7—冷却水进口；8—溶液箱；9—耐腐蚀离心泵；10—溶液主阀；11—电化学工作站；12—数据采集平台；13—溶液缓冲箱；14—测试通道；15—集成电极测试探头；16—溶液均布箱；17—耐腐蚀转子流量计；18—流量控制阀；19—回流阀

Fig.1 Schematic diagram of the experimental set-up

图2 测试通道示意图

Fig.2 Detailed scheme of test channel

表1 X80管线钢化学成分组成

Table 1 Chemical composition of X80 pipeline steel

成分	含量/%(质量)
Mn	1.83
Si	0.28
C	0.063
Cr	0.03
S	0.0006
P	0.011
Ni	0.03
Ti	0.016
Nb	0.061
Mo	0.22
V	0.059

图3 试样表面缺陷坑示意图

Fig.3 Specification of specimen with surface defect

图4 集成电极示意图1—环氧树脂；2—对电极；3—参比电极；4—工作电极

Fig.4 Electrode configuration in the electrochemical probe

图5 不同流速下的电化学阻抗谱

Fig.5 EIS under different flow velocity

图6 拟合电路的等效电路图

Fig.6 Equivalent circuit diagram of fitting circuit

表2 拟合电路数据

Table 2 Equivalent circuit fitting of EIS data

(m·s^-1)

R_s/(Ω·cm²)

Q_dl/(Ω^-1·cm^-2·s^-ⁿ)

R_ct/(Ω·cm²)

L/(H·cm^-2)

R_L/(Ω·cm²)

Q_f/(Ω^-1·cm^-2·s^-ⁿ)

图7 不同流速下各位置腐蚀产物膜微观形貌

Fig.7 Microscopic morphology of corrosion scale at various areas under different flow velocity

图8 腐蚀产物膜EDS分析

Fig.8 EDS analysis of corrosion scale

图9 腐蚀产物膜XRD分析

Fig.9 XRD analysis of corrosion scale

表3 EDS检测数据

Table 3 Test data of EDS

v/(m·s^-1)	CK	OK	SiK	MnK	FeK
3	19.96	40.69	0.47	0.68	38.19
5	23.70	54.22	0.40	0.76	20.92
7	20.14	58.55	0.36	0.41	20.54

图10 沿流动方向近壁面剪切力分布

Fig.10 Wall shear stress distribution near the wall along the flow direction

图11 沿流动方向近壁面Re分布

Fig.11 Re near the wall along the flow direction

图12 沿流动方向近壁面湍流扩散率分布

Fig.12 Turbulent diffusion rate near the wall along the flow direction

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高剪切力流场下X80管线钢局部腐蚀深坑诱导局部湍流交互机理研究

Study on interaction mechanism of local turbulent flow induced by local corrosion of X80 pipeline steel in high shear flow field

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