Study of Crevice Corrosion Behavior and Its Mechanism of Carbon Steel in Simulated Oilfield Produced Fluid

WANG Qin-ying; WU Ya-fei; QIN Shu-zhi; XI Yu-chen; DONG Li-jin; ZHANG Hua-li; LI Yu-fei; ZHANG Zhi; ZHANG Jin; ZENG De-zhi; LIU Qi-lin

doi:10.16577/j.issn.1001-1560.2023.0140

Materials Protection >

2023 , Vol. 56 >Issue 6: 97 - 105

DOI: https://doi.org/10.16577/j.issn.1001-1560.2023.0140

Study of Crevice Corrosion Behavior and Its Mechanism of Carbon Steel in Simulated Oilfield Produced Fluid

WANG Qin-ying ,
WU Ya-fei ,
QIN Shu-zhi ,
XI Yu-chen ,
DONG Li-jin ,
ZHANG Hua-li ,
LI Yu-fei ,
ZHANG Zhi ,
ZHANG Jin ,
ZENG De-zhi ,
LIU Qi-lin

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1a. School of New Energy and Materials, 1b. School of Petroleum and Gas Engineering, Southwest Petroleum University, Chengdu 610500, China;
2. Engineering Technology Research Institute, PetroChina Southwest Oil and Gas Field Company, Deyang 618300, China;
3. Sichuan Northwest Mining Area, PetroChina Southwest Oil and Gas Field Company, Mianyang 621000, China

Received date: 2022-11-05

Revised date: 2022-12-04

Accepted date: 2023-01-15

Online published: 2023-07-14

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Abstract

For studying the crevice corrosion behavior and mechanism of Q235 carbon steel under different crevice widths and environmental temperatures, wire beam electrode (WBE) technology and electrochemical impedance spectroscopy (EIS) technology were used to study the differences in current density, polarization resistance, and corrosion morphology of wire beam electrodes. Results showed that when the crevice width was greater than 0.1 mm, the corrosion characteristics of the crevice were not obvious. When the crevice width was 0.1 mm, the maximum current density differences of carbon steel during the initial immersion at 25, 40, and 60 ℃ were 1.24, 19.90, and 7.20 μA/cm², respectively, while the maximum current density differences after 72 h of immersion were only 41.9%, 4.2%, and 11.9% of the initial immersions. In addition, the polarity conversion phenomenon of current occurred both inside and outside the crevice, indicating that Q235 carbon steel gradually transformed from local corrosion to uniform corrosion with the prolongation of immersion time. Moreover, increasing temperature could enhance the trend of crevice corrosion, and the causes of the most serious corrosion outside the crevice were insufficient soaking time and an increase in solution resistance drop. In general, FeOOH participating in the cathodic reaction caused the electrode to change from the anode to the cathode, while the dissolution reaction of the metal caused the electrode properties changing from the cathode to the anode.

Key words： Q235 carbon steel; wire beam electrode; crevice width; temperature; corrosion mechanism

Cite this article

WANG Qin-ying , WU Ya-fei , QIN Shu-zhi , XI Yu-chen , DONG Li-jin , ZHANG Hua-li , LI Yu-fei , ZHANG Zhi , ZHANG Jin , ZENG De-zhi , LIU Qi-lin . Study of Crevice Corrosion Behavior and Its Mechanism of Carbon Steel in Simulated Oilfield Produced Fluid[J]. Materials Protection, 2023 , 56(6) : 97 -105 . DOI: 10.16577/j.issn.1001-1560.2023.0140

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