Use of scanning reference electrode technique for characterizing pitting and general corrosion of carbon steel in neutral media |
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| Authors: | N Cui H Y Ma J L Luo S Chiovelli |
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| Institution: | 1. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G6;2. Syncrude Canada Ltd., Edmonton, Alberta, Canada T6N 1H4;1. Department of Materials Science, Lanzhou University, Lanzhou 730000, China;2. Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, PR China;1. Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, 660036, Russia;2. Institute of Chemistry and Chemical Technology, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, 660049, Russia;1. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China;2. Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan;3. Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan;1. Department of Signal Theory and Communications, Carlos III University, Leganés (Madrid), Spain;2. Instituto de Óptica, Consejo Superior de Investigaciones Científicas, Madrid, Spain;1. Brazilian Bioethanol Science and Technology Laboratory (CTBE/CNPEM), Campinas, São Paulo, Brazil;2. Institute of Science and Technology, Federal University of São Paulo (ICT/UNIFESP), São José dos Campos, São Paulo, Brazil;3. Department of Civil Engineering, Department of Chemical Engineering and Applied Chemistry, and School of Public Policy and Governance, University of Toronto, Toronto, Ontario, Canada;4. School of Chemical Engineering, University of Campinas (FEQ/UNICAMP), Campinas, São Paulo, Brazil |
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| Abstract: | The scanning reference electrode technique (SRET) was used to characterize the corrosion behavior of carbon steel in the NaNO2-containing chloride solution and tap water. In 10−3 MNaNO2+10−3 MNaCl+10−3 MNa2SO4 solution, the passivated carbon steel surface suffered the pitting. In this case, the size of anodic and cathodic areas on the corroding surface varied with the exposed time, but anodic and cathodic sites did not change. On the contrary, the carbon steel was corroded generally in the tap water. The localized anodes and cathodes on the corroding surface were not fixed but movable with the exposed time during the whole corrosion process, and the “movable anodes” can be in situ monitored and momentarily identified by SRET measurements. |
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| Keywords: | The scanning reference electrode technique Pitting General corrosion Carbon steel Potential distribution |
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