Investigating the mechanism of stress corrosion cracking in near-neutral and high pH environments for API 5L X52 steel |
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| Affiliation: | 1. University Ammar Thelidji of Laghouat, BP 37G, 03000 Laghouat, Algeria;2. University of Saâd Dahleb Blida, BP 270, Route de Soumaâ, Blida 09000, Algeria;3. Welding and Control Research Center, CSC Cheraga, Route de dely-brahim, Alger 16000, Algeria;1. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China;2. Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, Zhejiang, PR China;3. Aerospace Research Institute of Materials and Processing Technology, Beijing, 100076, PR China;1. Environmental Corrosion Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2. School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China;3. Key Laboratory of Materials Design and Preparation Technology of Hunan Province, Xiangtan University, Xiangtan 411105, China;4. Oil-Gas Storage and Transportation Company of Xinjiang Oilfield Branch, Karamay 834002, China |
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| Abstract: | Stress corrosion cracking behaviour of API-5L-X52 steel under cathodic protection in near-neutral and high pH conditions was studied using slow strain rate test method and electrochemical measurements. The slow strain rate test showed ductile and brittle fracture feature at low and high applied potentials, respectively. In order to identify the mechanism contributes in stress corrosion cracking; the electrochemical potentiodynamic polarisation test was done at fast and slow sweep rate. The results revealed that at near-neutral pH condition the anodic dissolution at crack tip was the dominant mechanism. While at high pH medium, the hydrogen based mechanism was dominant. |
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| Keywords: | A Steel B Polarisation B SEM C Cathodic protection C Hydrogen embrittlement C Stress corrosion |
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