Synergistic Effect of Cl- and SO42- on the Corrosion Behavior of 316L Stainless Steel

ZHAO Hengrui, HOU Zhengyu, YANG Haiyan, LIANG Shoucai, CHENG Longsheng, WANG Dan, XIE Fei

doi:10.16577/j.issn.1001-1560.2024.0130

Materials Protection >

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

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

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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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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ZHAO Hengrui, HOU Zhengyu, YANG Haiyan, LIANG Shoucai, CHENG Longsheng, WANG Dan, XIE Fei . Synergistic Effect of Cl^- and SO₄^2- on the Corrosion Behavior of 316L Stainless Steel[J]. Materials Protection, 2024 , 57(6) : 81 -87 . DOI: 10.16577/j.issn.1001-1560.2024.0130

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