Ultrafine-grained copper produced by machining and its unusual electrochemical corrosion resistance in acidic chloride pickling solutions |
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| Affiliation: | 1. School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 510641, PR China;2. Department of Chemistry, Guangzhou Medical College, Guangzhou 510182, PR China;1. Department of Mechanical Engineering, Auckland University of Technology, Auckland, New Zealand;2. Department of Materials and Mechanical Engineering, Universitat Politècnica de València, Valencia, Spain;1. School of Materials Science and Engineering, Shandong Jianzhu University, Jinan 250101, PR China;2. Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, PR China;1. Department of Materials, The University of Oxford, Park Road, Oxford OX1 3PH, UK;2. Department of Materials, Imperial College London, Royal School of Mines, Exhibition Road, London SW7 2AZ, UK |
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| Abstract: | Ultrafine-grained (UFG) copper was prepared by facile machining procedure. High resolution transmission electron microscopy images revealed that, in UFG Cu, minimum grain size of 80 nm could be formed when a small machining rake angle was applied. The electrochemical corrosion behavior of UFG Cu in 0.5 M HCl was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy. Comparing with coarse-grained Cu, UFG Cu exhibited notably declined corrosion current density. Particularly, when the size of Cu grains were reduced from 500 μm to 80 nm, the charge transfer resistance of anodic dissolution step dramatically increased from 200 to 621 Ω cm2. |
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| Keywords: | A Copper B Polarization B EIS C Acid corrosion |
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