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| Effect of Temperature on Corrosion Behavior of Pipeline Steels N80 and TP125V in Artificial CO2-saturated Fracturing Fluid of Shale Gas |
HUANG Jiahe1, YUAN Xi2, CHEN Wen2, YAN Wenjing2, JIN Zhengyu1, LIU Haixian1, LIU Hongfang3, LIU Hongwei1( ) |
1.School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China
2.Research Institute of Natural Gas Technology, Southwest Oil & Gasfield Company, China National Petroleum Corporation, Chengdu 610299, China
3.School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China |
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Abstract Temperature is one of the key factors influencing the corrosion of oil pipeline steel in the shale gas environment. This work studied the effect of temperature on the corrosion behavior of pipeline steels N80 and TP125V in an artificial CO2-saturated fracturing fluid of shale gas by means of mass loss measurement, electrochemical measurement, scanning electron microscopy, X-ray diffractometer and 3D microscope. Results indicate that among others, the corrosion rates of steels N80 and TP125V reached the highest at 100 ℃ with values of (0.169±0.014) and (0.198±0.007) mm/a, respectively. Correspondingly, the highest localized corrosion rates were 1.13 and 2.47 mm/a, while the densities of corrosion pits were 2.0×103 and 2.6×103 pits/cm2, respectively. In conclusion, the corrosion rates of steels N80 and TP125V increased firstly with the increasing temperature, further reached the maximum at 100 ℃, and then decreased gradually. The corrosion rates of N80 steel were higher than those of TP125V steel at 60 and 120 ℃ respectively, but the corrosion rates of the two steels are reversed at 90, 100, and 100 ℃. The temperature could also influence the structure and components of the formed corrosion products according to the surface analysis results.
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Received: 16 March 2022
32134.14.1005.4537.2022.076
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| Fund: National Natural Science Foundation of China(51901253);Guangdong Basic and Applied Basic Research Foundation(2019A1515011135);Fundamental Research Funds for the Central Universities(19lgzd18);Open Project Program of Hubei Key Laboratory of Materials Chemistry and Service Failure(2020MCF02) |
About author: LIU Hongwei, E-mail: liuhw35@mail.sysu.edu.cn
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