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| 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 |
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Cite this article:
WU Yuhang, CHEN Xu, WANG Shoude, LIU Chang, LIU Jie. Stress Corrosion Behavior of X70 Steel in an Artificial Near-neutral Soil Solution Under Direct Current. Journal of Chinese Society for Corrosion and protection, 2025, 45(2): 489-496.
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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.
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Received: 29 January 2024
32134.14.1005.4537.2024.040
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| Fund: “Chunhui International Cooperation Projects of the Ministry of Education of China”, General Program(LJKZ0416);Basic Research Project of Liaoning Provincial Department of Education of China(LJ212410148059) |
Corresponding Authors:
CHEN Xu, E-mail: chenxu@lnpu.edu.cn
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