Hydrogen permeation behavior of X70 pipeline steel simultaneously affected by tensile stress and sulfate-reducing bacteria |
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| Affiliation: | 1. Key Laboratory of Oil & Gas Storage and Transportation, College of Petroleum Engineering, Liaoning Shihua University, Fushun, Liaoning, 113001, China;2. College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao, Shandong, 266555, China;1. State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, Hubei 430081, China;2. Department of Mechanical Engineering, University of Calgary, Calgary, Alberta T2N 1N4, Canada;1. Department of Engineering Design and Materials, Norwegian University of Science and Technology (NTNU), 7491 Trondheim, Norway;2. GE Oil & Gas and NTNU, 1338 Sandvika, Norway;3. Instituto Sabato, San Martín, Argentina;1. Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, PR China;2. State Grid Zhejiang Electric Power Research Institute, Hangzhou, 310000, PR China;3. Engineering Technology Institute, CITIC Dicastal Co. Ltd, Hebei, 066000, PR China;4. Safetech Research Institute, Beijing, 100083, PR China;1. Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, PR China;2. Safetech Research Institute, Beijing, 100083, PR China;1. College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao, Shandong 266555, China;2. Key Laboratory of Oil & Gas Storage and Transportation, College of Petroleum Engineering, Liaoning Shihua University, Fushun, Liaoning 113001, China |
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| Abstract: | The hydrogen permeation behavior of submarine pipelines buried in anoxic sea mud and protected by cathodic potential is affected by both sulfate-reducing bacteria (SRB) and tensile stress. In this study, the individual and simultaneous effects of SRB and tensile stress on hydrogen permeation parameters were investigated using an electrochemical hydrogen permeation method together with mechanical tensile tests. Cathodic potentiodynamic polarization and surface morphology investigations were also conducted. Both elastic and plastic stresses were considered. Results showed that SRB enhanced the sub-surface hydrogen concentration significantly but had little influence on the diffusion coefficient. Elastic stress had a minimal effect on the hydrogen permeation behavior of X70 steel. Plastic stress reduced the diffusion coefficient and increased the sub-surface hydrogen concentration. The lattice trap produced by plastic deformation was responsible for the impact of plastic stress on hydrogen permeation. SRB and plastic stress not only enhanced the sub-surface hydrogen concentration independently, but also had synergistic effects accelerating the hydrogen accumulation on a steel surface. |
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| Keywords: | Pipeline steel Hydrogen permeation Sulfate-reducing bacteria Tensile stress |
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