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Corrosion Behavior of X65 Carbon Steel in CO2Containing Liquids with Constant pH and Ferrous Ion Concentration |
Xiankang ZHONG(),Junying HU |
1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, School of Oil and Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, China |
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Abstract The corrosion test of carbon steel in a closed vessel with desired liquids will usually result in obviously changes in pH and ferrous ion concentration. However, in oil and gas field the pH and ferrous ion concentration at any specific location in side a pipeline does not change significantly with time. In this work, ion exchange resin was used to adjust the pH and ferrous ion concentration of the CO2containing liquids during the corrosion process of X65 steel in a small loop, where the initial pH was 5.80 and initial ferrous ion concentration was 20 mg/L. In this case, the test loop full of CO2containing liquids with constant pH and constant ferrous ion concentration was developed. Then, the corrosion of X65 steel in such an environment was investigated by open circuit potential, linear polarization resistance and surface analysis techniques. As a comparison, the corrosion of X65 carbon steel in liquid with inconstant pH and ferrous ion concentration (no adjustment for the pH and ferrous ion concentration during the corrosion) was also studied. The results showed that under the inconstant condition, the corrosion rate of X65 sharply decreased after 120 h. The corrosion rate was about 0.5 mm/a after 220 h. The corrosion product composed of very compact ferrous carbonate. However, under the condition of constant pH and ferrous ion concentration, the corrosion rate of X65 did not start to slowly decrease until 160 h; while the corrosion rate was still as high as 4.5 mm/a after 220 h. Many cracks in the corrosion products layer and obvious gaps between the substrate and corrosion product layer could also be found. Therefore, it is essential to maintain a relatively constant pH and ferrous ion concentration in a closed vessel of CO2containing liquid when one tries to reproduce the CO2corrosion behavior of carbon steel as that emerged in oil and gas field.
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Received: 20 November 2017
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Fund: 国家自然科学基金(51601159);Applied and Fundamental Research of Sichuan Province(2017JY0171) |
Corresponding Authors:
Xiankang ZHONG
E-mail: zhongxk@swpu.edu.cn
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