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| Effect of Temperature on Corrosion Behavior of X70 Steel in an Artificial CO2-containing Formation Water |
MING Nanxi, WANG Qishan, HE Chuan, ZHENG Ping, CHEN Xu( ) |
| School of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China |
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Abstract The corrosion behaviour of X70 pipeline steel in an artificial CO2-containing formation water at various temperatures was studied in a high-temperature, high-pressure reaction kettle via mass loss measurements, scanning electron microscopy, energy dispersive spectroscopy, X-ray diffractometer, and electrochemical methods. Thermodynamic and kinetic factors related to the CO2 corrosion mechanism of X70 steel were assessed. The results show that the temperature influenced the corrosion rate of X70 steel by affecting the supersaturation, nucleation rate, and grain growth rate of FeCO3. The corrosion product scale could not form on the surface of X70 steel at 30 ℃ because of the lower FeCO3 supersaturation. A dense FeCO3 scale formed at 60 and 90 ℃, resulting in a decrease in the corrosion rate. When the temperature was higher than 120 ℃, the nucleation rate of FeCO3 was less than its growth rate, consequently, a complete protective FeCO3 scale could not form on the X70 steel surface, while the stress accumulation inside the scale led to the rupture of the scale, which may be the cause leading to the formation of a galvanic cell consisting of the FeCO3 film and matrix metal, which resulted in local corrosion.
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Received: 08 January 2020
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| Fund: Chunhui Program of the Ministry of Education of China and Key Project of Education Department of;Liaoning Province(L2017LZD004) |
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Corresponding Authors:
CHEN Xu
E-mail: cx0402@sina.com
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About author: CHEN Xu, E-mail: cx0402@sina.com
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