阴极保护条件对高压直流干扰下<strong>X80</strong>钢腐蚀行为的影响规律及作用机制

doi:10.11900/0412.1961.2023.00238

金属学报

2025, Vol. 61

Issue (6): 917-928 DOI: 10.11900/0412.1961.2023.00238

研究论文

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阴极保护条件对高压直流干扰下X80钢腐蚀行为的影响规律及作用机制

谷少杰¹, 刘洋¹, 李彩霞¹, 胡上茂², 杜艳霞¹(

)

1 北京科技大学新材料技术研究院北京 100083
2 南方电网科学研究院有限责任公司广州 510663

Effect and Mechanism of Cathodic Protection Conditions on the Corrosion Behavior of X80 Steel Under HVDC Interference

GU Shaojie¹, LIU Yang¹, LI Caixia¹, HU Shangmao², DU Yanxia¹(

)

1 Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
2 CSG Electric Power Research Institute, China Southern Power Grid, Guangzhou 510663, China

引用本文:

谷少杰, 刘洋, 李彩霞, 胡上茂, 杜艳霞. 阴极保护条件对高压直流干扰下X80钢腐蚀行为的影响规律及作用机制[J]. 金属学报, 2025, 61(6): 917-928.
Shaojie GU, Yang LIU, Caixia LI, Shangmao HU, Yanxia DU. Effect and Mechanism of Cathodic Protection Conditions on the Corrosion Behavior of X80 Steel Under HVDC Interference[J]. Acta Metall Sin, 2025, 61(6): 917-928.

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摘要:

近年来，埋地油气管道受到的高压直流干扰问题引起广泛关注，如何准确评估高压直流干扰对埋地金属管道带来的腐蚀影响，并进行有效的防护成为实际生产的迫切需求，但目前较少关注管道本身的阴极保护对高压直流干扰下腐蚀行为的作用。本工作通过实验室模拟实验，研究了高压直流干扰前阴极保护条件对高压直流干扰下X80钢腐蚀行为的影响。结果表明，在20 V直流干扰1 h作用下，未施加阴极保护时X80钢的腐蚀速率为170.81 μm/h，阴极保护预处理电位为-0.85、-0.95、-1.05及-1.20 V时，腐蚀速率分别为124.39、87.13、54.56及1.45 μm/h。通过表面产物膜层、电化学阻抗谱、极化特性等分析了不同阴极保护预处理电位对高压直流腐蚀行为的影响机制，结果表明，-0.85~-1.05 V下，直流干扰后试样产物主要是绿锈(GR1)和钙镁沉积层的混合物，试样腐蚀速率随阴极保护预处理电位逐渐负移而降低，原因是试样表面生成的钙镁沉积层质量逐渐升高；-1.20 V阴极保护极化电位下，腐蚀速率远小于其他电位的原因是试样在高阴极保护电位和高压直流干扰的综合作用下产生了钝化。

关键词 ： X80钢, 高压直流干扰, 阴极保护, 腐蚀行为

Abstract：

Recently, the problem of high-voltage direct current (HVDC) interference suffered by buried oil and gas pipelines has attracted widespread attention among research communities. Hence, accurately assessing the corrosive impact of HVDC interference on buried metal pipelines and performing effective protection procedures for the prevention of such corrosion have become priority issues that need to be resolved for producing reinforced pipelines. To date, the effect of the cathodic protection of the pipeline on the corrosion behavior of X80 steel under HVDC interference has rarely been reported. Hence, in this study, the corrosion behavior of X80 steel without cathodic protection conditions before HVDC interference and the effect of these protection conditions on the corrosion behavior of X80 steel under HVDC interference were studied through laboratory simulation experiments. Results showed that the corrosion rate of X80 steel was 170.81 μm/h without cathodic protection under 20 V DC interference for 1 h. When the cathodic protection pretreatment potentials were -0.85, -0.95, -1.05, and -1.20 V, the corrosion rates were 124.39, 87.13, 54.56, and 1.45 μm/h, respectively. The effect of various cathodic protection pretreatment potentials on the corrosion behavior of X80 steel under HVDC interference was clarified based on the product surface membrane layer, polarization, and EIS results. For the cathodic protection pretreatment potential of -0.85 to -1.05 V, the sample products after HVDC interference mainly showed a mixture of green rust GR1, calcium, and magnesium deposits; the corrosion rate of the sample products decreased with the increasing negative cathodic protection pretreatment potential under DC interference due to the gradual increase in the quality of the calcium and magnesium deposited layer on the surface of the sample products. At -1.20 V cathodic protection polarization potential, the corrosion rate of the sample products was substantially lower than that at other potentials because passivation of the products occurred under the combined action of high cathodic protection potential and HVDC interference.

Key words： X80 steel HVDC interference cathodic protection corrosion behavior

收稿日期: 2023-06-05

通讯作者: 杜艳霞，duyanxia@ustb.edu.cn，主要从事阴极保护及杂散电流干扰方面的研究

Corresponding author: DU Yanxia, professor, Tel: (010)62333972, E-mail: duyanxia@ustb.edu.cn

作者简介: 谷少杰，男，1996年生，硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2023.00238 或 https://www.ams.org.cn/CN/Y2025/V61/I6/917

图1 阴极保护系统装置和高压直流干扰模拟实验装置图

图2 不同阴极保护极化电位时的电流密度变化及腐蚀速率

图3 不同阴极保护极化电位条件下阴极保护4 d后试样的表面宏观形貌

图4 不同阴保电位直流干扰后及酸洗后试样的宏观腐蚀形貌

图5 干扰后试样表面腐蚀产物的XRD谱

图6 -1.20 V阴极保护4 d、20 V直流干扰1 h后试样腐蚀产物的XPS

图7 不同阴极保护极化电位阴极保护4 d后的电化学阻抗谱(EIS)

图8 阴极保护后EIS等效电路图

表1 阴极保护后EIS拟合结果

图9 不同阴极保护极化电位阴极保护4 d、20 V直流干扰1 h后的EIS

表2 阴极保护干扰后EIS拟合结果

图10 不同阴极保护极化电位阴极保护4 d后试样表面微观形貌及EDS分析结果

图11 不同阴极保护极化电位阴极保护4 d、20 V直流干扰1 h后试样表面微观形貌及EDS分析结果

图12 -1.20 V阴极保护下试样表面的Cl-浓度变化曲线，及不同阴极保护电位下试样的阳极极化曲线

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