Influence of some anions on the stress corrosion of low alloy steels in aqueous solutions |
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| Affiliation: | 1. School of Mechanical and Automotive Engineering, Qingdao University of Technology, 266520, Qingdao, China;2. Department of Mechanical Engineering, Lebanese American University, Kraytem, 1102-2801, Beirut, Lebanon;3. Centre of Research Impact and Outcome, Chitkara University Institute of Engineering and Technology, Chitkara University, Rajpura,140401, Punjab, India;4. Faculty of Mechanical Engineering, Opole University of Technology, 45-758 Opole, Poland;5. Lloyd Institute of Engineering & Technology, Plot No. 3, Knowledge Park II, Greater Noida, Uttar Pradesh, 201306, India;6. Lloyd Institute of Management and Technology, Plot No 11, Knowledge Park II, Greater Noida, Uttar Pradesh, 201306, India;7. Department of Quantitative Analysis, College of Business Administration, King Saud University, P.O. Box 71115, Riyadh, 11587, Saudi Arabia;8. Department of Mathematics and Statistics, Riphah International University, I-14, Islamabad, 44000, Pakistan;1. Materials Science Division, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA;2. Department of Microstructure Physics and Alloy Design, Max-Planck Institut für Eisenforschung GmbH, Max-Planck-Str. 1, 40237 Düsseldorf, Germany;3. National Energy Technology Laboratory, 1450 Queen Ave. SW, Albany, OR 97321, USA;4. Los Alamos Neutron Science Center, Los Alamos National Laboratory, Los Alamos, NM 87545, USA;5. Department of Materials, Royal School of Mines, Imperial College London, Prince Consort Road, London SW7 2BP, UK;6. Department of Nuclear Engineering, University of California at Berkeley, Berkeley, CA 94720, USA;1. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing, 100083, PR China;2. Innovation Group of Marine Engineering Materials and Corrosion Control, Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai, 519080, PR China;3. Division of Surface & Corrosion Science, Dept. of Chemistry, School of Chemical Science and Engineering, KTH Royal Institute of Technology, SE-100 44, Stockholm, Sweden;1. Tech Institute for Advanced Materials, College of Materials Science and Technology, Nanjing Tech University, Nanjing 210009, China;2. SHANGI Institute for Advanced Materials(Nanjing) Co., Ltd., Nanjing 210038, China;3. Aeronautical Key Laboratory for Plastic Forming Technology, Beijing 100024, China;1. Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou, 341000, China;2. Ganjiang Innovation Academy, Jiangxi Institute of Rare Earths, Chinese Academy of Sciences, Ganzhou, 341000, China;1. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, PR China;2. Zhejiang E.O. Paton Welding Technology Institute, Hangzhou, 311200, PR China |
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| Abstract: | Polarization and stress corrosion behaviour of two types of low alloy steels, AISI 4130X and AISI 4145, were studied in agitated 0.05 M sodium acetate and 0.05 M trisodium phosphate solutions saturated with natural gas at room temperature. The magnitude of currents, shown in potentiokinetic polarization curves in the range of —0.8 V(SCE) to +0.8 V(SCE) in these media, is very small compared with earlier results obtained in sulphate and chloride solutions.Stress corrosion experiments conducted using a slow strain rate technique under cathodic conditions indicate the onset of hydrogen embrittlement on both types of steel in sulphate, chloride, acetate and phosphate solutions. Under anodic conditions, the results in 0.05 M sodium acetate solutions indicate strong susceptibility to stress corrosion compared with no susceptibility in 0.05 M trisodium phosphate solutions if there is no onset of pitting. These results are in contrast with results showing strong anodic dissolution and consequent absence of stress corrosion under anodic conditions in sulphate and chloride media.Results of Auger and IR analyses of anodic surface films formed in acetate and phosphate solutions are presented and discussed in relation to their observed mechanical behaviour. |
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