Effect of Service Environmental Parameters on Electrochemical Corrosion Behavior of L80 Casing Steel
The corrosion behavior of L80 casing steel was studied in a simulating annulus environment using the electrochemical measurement method, immersion test, and tensile test under a high-temperature and high-pressure H<sub>2</sub>S/CO<sub>2</sub> environment. The partial pressure...
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MDPI AG
2021-09-01
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| Online Access: | https://www.mdpi.com/1996-1944/14/19/5575 |
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| author | Xiaoguang Sun Huaiyun Cui Zhong Li Renyang He Zhiyong Liu Lin Lu |
| author_facet | Xiaoguang Sun Huaiyun Cui Zhong Li Renyang He Zhiyong Liu Lin Lu |
| author_sort | Xiaoguang Sun |
| collection | DOAJ |
| description | The corrosion behavior of L80 casing steel was studied in a simulating annulus environment using the electrochemical measurement method, immersion test, and tensile test under a high-temperature and high-pressure H<sub>2</sub>S/CO<sub>2</sub> environment. The partial pressure of CO<sub>2</sub> (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>P</mi><mrow><msub><mrow><mi>CO</mi></mrow><mn>2</mn></msub></mrow></msub></mrow></semantics></math></inline-formula>), the partial pressure of H<sub>2</sub>S (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>P</mi><mrow><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mi mathvariant="normal">S</mi></mrow></msub></mrow></semantics></math></inline-formula>), water content, and preloading stress remarkably affected the corrosion behavior of L80 steel. The influence of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>P</mi><mrow><msub><mrow><mi>CO</mi></mrow><mn>2</mn></msub></mrow></msub></mrow></semantics></math></inline-formula> on stress corrosion cracking (SCC) susceptibility has an inflection point of approximately 1.1 MPa. The SCC susceptibility reaches the maximum when the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>P</mi><mrow><msub><mrow><mi>CO</mi></mrow><mn>2</mn></msub></mrow></msub></mrow></semantics></math></inline-formula> is about 1.1 MPa. The SCC susceptibility has a positive correlation to <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>P</mi><mrow><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mi mathvariant="normal">S</mi></mrow></msub></mrow></semantics></math></inline-formula> and water content. The higher water content of the corrosion medium can increase the electrical conductivity of the corrosion medium and promote the corrosion of L80 steel, which can improve the diffusion of hydrogen into steel and promote the SCC of L80 steel. Preloading stress can promote local corrosion, thereby promoting SCC of steel under stress. The dislocation emergence point caused by preloading stress can accelerate the diffusion of hydrogen into steel and increase SCC susceptibility. |
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| spelling | doaj.art-3956d91064da475084009840310d34112023-11-22T16:23:53ZengMDPI AGMaterials1996-19442021-09-011419557510.3390/ma14195575Effect of Service Environmental Parameters on Electrochemical Corrosion Behavior of L80 Casing SteelXiaoguang Sun0Huaiyun Cui1Zhong Li2Renyang He3Zhiyong Liu4Lin Lu5Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaInstitute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaChinese Society for Corrosion and Protection, Beijing 100083, ChinaChina Special Equipment Inspection and Research Institute, Beijing 100029, ChinaInstitute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaInstitute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, ChinaThe corrosion behavior of L80 casing steel was studied in a simulating annulus environment using the electrochemical measurement method, immersion test, and tensile test under a high-temperature and high-pressure H<sub>2</sub>S/CO<sub>2</sub> environment. The partial pressure of CO<sub>2</sub> (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>P</mi><mrow><msub><mrow><mi>CO</mi></mrow><mn>2</mn></msub></mrow></msub></mrow></semantics></math></inline-formula>), the partial pressure of H<sub>2</sub>S (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>P</mi><mrow><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mi mathvariant="normal">S</mi></mrow></msub></mrow></semantics></math></inline-formula>), water content, and preloading stress remarkably affected the corrosion behavior of L80 steel. The influence of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>P</mi><mrow><msub><mrow><mi>CO</mi></mrow><mn>2</mn></msub></mrow></msub></mrow></semantics></math></inline-formula> on stress corrosion cracking (SCC) susceptibility has an inflection point of approximately 1.1 MPa. The SCC susceptibility reaches the maximum when the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>P</mi><mrow><msub><mrow><mi>CO</mi></mrow><mn>2</mn></msub></mrow></msub></mrow></semantics></math></inline-formula> is about 1.1 MPa. The SCC susceptibility has a positive correlation to <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mi>P</mi><mrow><msub><mi mathvariant="normal">H</mi><mn>2</mn></msub><mi mathvariant="normal">S</mi></mrow></msub></mrow></semantics></math></inline-formula> and water content. The higher water content of the corrosion medium can increase the electrical conductivity of the corrosion medium and promote the corrosion of L80 steel, which can improve the diffusion of hydrogen into steel and promote the SCC of L80 steel. Preloading stress can promote local corrosion, thereby promoting SCC of steel under stress. The dislocation emergence point caused by preloading stress can accelerate the diffusion of hydrogen into steel and increase SCC susceptibility.https://www.mdpi.com/1996-1944/14/19/5575L80 casing steelannulus environment parametersstress corrosionelectrochemicalpreloading stress |
| spellingShingle | Xiaoguang Sun Huaiyun Cui Zhong Li Renyang He Zhiyong Liu Lin Lu Effect of Service Environmental Parameters on Electrochemical Corrosion Behavior of L80 Casing Steel Materials L80 casing steel annulus environment parameters stress corrosion electrochemical preloading stress |
| title | Effect of Service Environmental Parameters on Electrochemical Corrosion Behavior of L80 Casing Steel |
| title_full | Effect of Service Environmental Parameters on Electrochemical Corrosion Behavior of L80 Casing Steel |
| title_fullStr | Effect of Service Environmental Parameters on Electrochemical Corrosion Behavior of L80 Casing Steel |
| title_full_unstemmed | Effect of Service Environmental Parameters on Electrochemical Corrosion Behavior of L80 Casing Steel |
| title_short | Effect of Service Environmental Parameters on Electrochemical Corrosion Behavior of L80 Casing Steel |
| title_sort | effect of service environmental parameters on electrochemical corrosion behavior of l80 casing steel |
| topic | L80 casing steel annulus environment parameters stress corrosion electrochemical preloading stress |
| url | https://www.mdpi.com/1996-1944/14/19/5575 |
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