316L不锈钢在Cl-与SO42-协同作用下的腐蚀行为研究

赵恒瑞, 侯政煜, 杨海燕, 梁守才, 程龙生, 王丹, 谢飞

doi:10.16577/j.issn.1001-1560.2024.0130

材料保护 >

2024 , Vol. 57 >Issue 6: 81 - 87

DOI: https://doi.org/10.16577/j.issn.1001-1560.2024.0130

研究篇

316L不锈钢在Cl^-与SO₄^2-协同作用下的腐蚀行为研究

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(1. 辽宁石油化工大学石油天然气工程学院, 辽宁抚顺 113001;2. 中国石油大庆炼化公司, 黑龙江大庆 163712; 3. 中石油辽河油田油气集输公司, 辽宁盘锦 124010;4. 浙石化新奥 (舟山) 燃气有限公司, 浙江舟山 316100)

谢飞(1983-),教授，博士，主要从事油气管道腐蚀工程与安全保障技术研究，电话：13942359915,E-mail:xiefei0413@163.com

收稿日期: 2023-11-17

修回日期: 2024-01-10

录用日期: 2024-01-25

网络出版日期: 2024-06-24

基金资助

辽宁省自然科学基金(2022-MS-362)

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Synergistic Effect of Cl^- and SO₄^2- on the Corrosion Behavior of 316L Stainless Steel

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(1. College of Petroleum and Natural Gas Engineering, Liaoning Petrochemical University, Fushun 113001, China;2. PetroChina Daqing Refining and Chemical Company, Daqing 163712, China;3. PetroChina Liaohe Oilfield Oil and Gas Gathering and Transportation Company, Panjin 124010, China;4. Sinopec Xinao (Zhoushan) Gas Co., Ltd., Zhoushan 316100, China)

XIE Fei (1983-), Professor, Ph.D., Research Focus: Corrosion Engineering and Safety Assurance Technology of Oil and Gas Pipelines, Tel.: 13942359915, E-mail: xiefei0413@163.com

Received date: 2023-11-17

Revised date: 2024-01-10

Accepted date: 2024-01-25

Online published: 2024-06-24

Supported by

Natural Science Foundation of Liaoning Province(2022-MS-362)

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摘要

为了降低腐蚀对海洋油气管道正常运行的危害，利用电化学试验中的交流阻抗技术以及循化极化技术研究了模拟南海海洋环境中Cl^-与SO₄^2-的协同作用对316L不锈钢腐蚀行为的影响，并结合扫描电子显微镜(SEM)对316L不锈钢表面的腐蚀形貌进行表征。结果表明，当SO₄^2-含量恒定时，Cl^-含量的升高会使容抗弧半径、极化电阻R_p以及点蚀电位E_b均降低，当Cl^-含量从0升至50 g/L时，316L不锈钢表面出现了明显的腐蚀情况。当Cl^-含量恒定时，SO₄^2-含量的升高会使容抗弧半径、R_p以及E_b值均减小，同时试件表面的腐蚀坑直径扩大，深度出现逐渐加深的情况。

关键词： 316L不锈钢; 海洋环境; Cl^-; SO₄^2-; 协同作用; 循环极化

本文引用格式

赵恒瑞, 侯政煜, 杨海燕, 梁守才, 程龙生, 王丹, 谢飞 . 316L不锈钢在Cl^-与SO₄^2-协同作用下的腐蚀行为研究[J]. 材料保护, 2024 , 57(6) : 81 -87 . DOI: 10.16577/j.issn.1001-1560.2024.0130

Abstract

In order to reduce the harm caused by corrosion to the normal operation of offshore oil and gas pipelines, the effects of the synergistic effect of Cl^- and SO₄^2- on the corrosion behavior of 316L stainless steel in the simulated South China Sea marine environment were investigated through the AC impedance technique and the cyclic polarization technique in electrochemical tests, and the corrosion morphology of 316L stainless steel surface was characterized by scanning electron microscopy(SEM). Results showed that when the SO₄^2- content was constant, an increase in Cl^- content could reduce the capacitive arc radius, polarization resistance R_p and pitting potential E_b. As the Cl^- content increased from 0 to 50 g/L, significant corrosion was observed on the surface of 316L stainless steel. When the Cl^- content was constant, an increase in SO₄^2- content reduced the capacitive arc radius, R_p and E_b values. At the same time, the diameter of the corrosion pit on the surface of the specimen expanded, and the depth gradually deepened.

Key words： 316L stainless steel; marine environment; Cl^-; SO₄^2-; synergistic effect; cyclic polarization

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