NaCl浓度对X80管线钢母材和焊缝区电化学腐蚀行为的研究

张颖, 杨育智, 余柳丝, 王怡佳

doi:10.16577/j.issn.1001-1560.2024.0083

材料保护 >

2024 , Vol. 57 >Issue 4: 106 - 113

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0083

研究篇

NaCl浓度对X80管线钢母材和焊缝区电化学腐蚀行为的研究

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（1. 四川轻化工大学机械工程学院，四川自贡643000；2. 眉山职业技术学院，四川眉山620010；
3. 四川省特种设备检验研究院，四川成都610000）

杨育智(1999-)，在读硕士研究生，主要研究方向为机械设计与制造、电化学腐蚀等，E-mail：762480282@qq.com

收稿日期: 2023-10-26

修回日期: 2023-12-10

录用日期: 2023-12-25

网络出版日期: 2024-04-30

基金资助

国家自然科学基金(51974271)；四川省重点研发项目(2020YFSY0038)；四川省特种设备检验研究院科研项目(SCTJ-2022-YN04)资助

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Study on the Influence of Sodium Chloride Concentration on the Electrochemical Corrosion Behavior of X80 Pipeline Steel Base Material and Weld Zone

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(1. School of Mechanical Engineering, Sichuan University of Science and Engineering, Zigong 643000, China;
2.Meishan Vocational and Technical College, Meishan 620010, China;
3.Sichuan Special Equipment Inspection Institute, Chengdu 610000, China)

YANG Yuzhi(1999-), Master's Candidate, Research Focus: Mechanical Design and Manufacturing, Electrochemical Corrosion, E-mail: 762480282@qq.com

Received date: 2023-10-26

Revised date: 2023-12-10

Accepted date: 2023-12-25

Online published: 2024-04-30

Supported by

National Natural Science Foundation of China (51974271); Key Research and Development Project of Sichuan Province (2020YFSY0038); Research Project of Sichuan Special Equipment Inspection Research Institute (SCTJ-2022-YN04)

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摘要

随着我国海洋油气资源的不断开发，管道焊接接头的腐蚀问题已成为海洋运行管线失效和安全的主要因素之一。为给海洋管道的腐蚀防护与材料选择提供更为精确的理论依据和实际指导，采用动电位极化技术和电化学阻抗谱测试方法，研究了X80管线钢焊接接头的母材区和焊缝区在不同NaCl溶液浓度(1.5%、3.5%、5.5%,质量分数)中的电化学腐蚀行为。结果表明：在不同NaCl浓度的溶液中，母材区和焊缝区的极化曲线都具有明显的阳极溶解特征，没有钝化现象；随着NaCl浓度的增加，2个区域的开路电位和自腐蚀电位负移，极化电阻先减小后增大，自腐蚀电流密度先增大后减小；母材区的热力学稳定性和耐腐蚀性始终优于焊缝区的。

关键词： 焊缝区; X80管线钢; 电化学腐蚀; NaCl浓度

本文引用格式

张颖, 杨育智, 余柳丝, 王怡佳 . NaCl浓度对X80管线钢母材和焊缝区电化学腐蚀行为的研究[J]. 材料保护, 2024 , 57(4) : 106 -113 . DOI: 10.16577/j.issn.1001-1560.2024.0083

Abstract

With the continuous development of China's offshore oil and gas resources, the corrosion of pipeline welded joints has become one of the main factors leading to the failure and safety of marine operating pipelines. In order to provide more accurate theoretical basis and practical guidance for corrosion protection and material selection of marine pipelines, the electrochemical corrosion behaviors of the base material and weld zone of X80 pipeline steel welded joints were studied in different NaCl solution concentrations(1.5%, 3.5%, 5.5%, mass fraction) via dynamic potential polarization technology and electrochemical impedance spectroscopy testing method. Results showed that in the solutions with different NaCl concentrations, the polarization curves of the base material and weld zone exhibited obvious anodic dissolution characteristics without passivation phenomenon. With the increase of NaCl concentration, the open circuit potential and self-corrosion potential of the two regions shifted negatively, the polarization resistance first decreased and then increased, and the self-corrosion current density first increased and then decreased. Furthermore, the thermodynamic stability and corrosion resistance of the base material zone were always superior to those of the weld zone.

Key words： weldzone; X80 pipeline steel; electrochemical corrosion; NaCl concentration

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