直流电作用下<strong>X70</strong>钢在近中性土壤中应力腐蚀行为研究

doi:10.11902/1005.4537.2024.040

中国腐蚀与防护学报

2025, Vol. 45

Issue (2): 489-496 CSTR: 32134.14.1005.4537.2024.040 DOI: 10.11902/1005.4537.2024.040

研究报告

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直流电作用下X70钢在近中性土壤中应力腐蚀行为研究

吴宇航¹, 陈旭¹(

), 王首德², 刘畅², 刘杰¹

^1.辽宁石油化工大学石油天然气工程学院抚顺 113001
^2.中国石油天然气股份有限公司大庆炼化分公司大庆 163411

Stress Corrosion Behavior of X70 Steel in an Artificial Near-neutral Soil Solution Under Direct Current

WU Yuhang¹, CHEN Xu¹(

), WANG Shoude², LIU Chang², LIU Jie¹

^1.College of Petroleum Engineering, Liaoning Petrochemical University, Fushun 113001, China
^2.China National Petroleum Corporation Daqing Refining & Chemical Company, Daqing 163411, China

引用本文:

吴宇航, 陈旭, 王首德, 刘畅, 刘杰. 直流电作用下X70钢在近中性土壤中应力腐蚀行为研究[J]. 中国腐蚀与防护学报, 2025, 45(2): 489-496.
Yuhang WU, Xu CHEN, Shoude WANG, Chang LIU, Jie LIU. Stress Corrosion Behavior of X70 Steel in an Artificial Near-neutral Soil Solution Under Direct Current[J]. Journal of Chinese Society for Corrosion and protection, 2025, 45(2): 489-496.

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摘要:

采用极化曲线、电化学阻抗谱技术和慢应变速率拉伸方法，研究了直流电(DC)作用下X70钢在近中性土壤模拟溶液中的应力腐蚀敏感性。通过对断口表面形貌观察，分析了不同DC下X70钢的开裂机制。结果表明：随着DC密度增加，X70钢阳极极化程度增加，表面生成的氧化膜具有一定的保护作用。当DC密度不大于0.5 mA/cm²时，腐蚀速率随DC密度增加而降低。DC密度增加至1 mA/cm²时，腐蚀产物膜不能阻止阳极溶解，腐蚀速率急剧增大。无DC时，X70钢开裂机制为氢致开裂。DC和应力协同作用下，DC导致裂纹尖端持续发生阳极溶解。随DC密度增加，X70钢在近中性土壤模拟溶液中的开裂机制由氢致开裂转变为阳极溶解。

关键词 ： X70钢, 近中性溶液, 直流电流, 应力腐蚀, 开裂机制

Abstract：

With the development of urban construction, it is inevitable that high voltage direct current transmission projects and buried oil and gas pipelines often share the proximity of public space corridors. Therefore, the potential danger of corrosion and damage to the adjacent buried oil and gas pipelines due to current leakage of transmission lines is becoming more and more prominent. In this paper, the stress corrosion sensitivity of X70 steel in a simulated solution of near-neutral soil under direct current (DC) was studied by means of electrochemical polarization curve, electrochemical impedance spectroscopy and slow strain rate tensile method. The results showed that the anode polarization of X70 steel increased with the increase in DC density. When the DC density was less than 0.5 mA/cm², the corrosion rate decreased with the increase in DC density. When the DC density increased to 1 mA/cm², the corrosion product film could not prevent the anodic dissolution and the corrosion rate increased sharply. In the absence of DC, the cracking mechanism of X70 steel was hydrogen induced cracking. Under the synergistic effect of DC and stress, DC led to continuous anodic dissolution at the crack tip. With the increase in DC density, the cracking mechanism of X70 steel in the simulated solution of near-neutral pH changed from hydrogen induced cracking to anodic dissolution.

Key words： X70 pipeline steel near-neutral solution direct current stress corrosion cracking mechanism

收稿日期: 2024-01-29 32134.14.1005.4537.2024.040

ZTFLH:

TG147

基金资助:教育部“春晖”国际合作计划项目，辽宁省教育厅面上项目(LJKZ0416);辽宁省教育厅项目(LJ212410148059)

通讯作者: 陈旭，E-mail：chenxu@lnpu.edu.cn，研究方向为金属材料腐蚀与防护

Corresponding author: CHEN Xu, E-mail: chenxu@lnpu.edu.cn

作者简介: 吴宇航，男，1996年生，硕士生

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https://www.jcscp.org/CN/10.11902/1005.4537.2024.040 或 https://www.jcscp.org/CN/Y2025/V45/I2/489

图1 X70钢的金相组织

图2 电化学测量实验装置示意图

图3 SSRT试件示意图

图4 不同DC下X70钢在NS4溶液中的开路电位

图5 不同DC密度下X70钢在NS4溶液中的极化曲线

图6 不同DC密度下X70钢在NS4溶液中的腐蚀电流密度

图7 不同电流密度下X70钢在NS4溶液中的EIS曲线

图8 等效电路图

表1 不同电流密度下X70钢在NS4溶液中的EIS拟合结果

图9 不同DC密度下X70钢在NS4溶液中应力-应变曲线

图10 不同DC密度下X70钢在NS4溶液中的延伸率和断面收缩率

图11 X70钢在不同DC密度下NS4溶液中断裂时间

图12 X70 钢在不同DC密度下NS4 溶液中主断口和侧断口形貌

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