The influence of copper upon the atmospheric corrosion of iron |
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| Affiliation: | 1. Max-Planck-Institut fur Eisenforschung, D-4000 Dusseldorf 1, F.R.G.;2. Department of Metallurgical Engineering, Karataka Regional Engineering College, Surathkal, Srinivasgar 574157, India;1. Key Laboratory of Metallurgical Emission Reduction & Resources Recycling, Ministry of Education, Anhui University of Technology, Maanshan, 243002, PR China;2. School of Environment and Municipal Engineering, Xi’an University of Architecture and Technology, Xi ‘an, 710055, PR China;1. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China;2. Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, Zhejiang, China;1. Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;2. Aero Engine Corporation of China Beijing Institute of Aeronautical Materials, Beijing 100095, China;1. Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai University of Electric Power, Shanghai 200090, PR China;2. Department of Chemistry, Zhejiang University, Hangzhou 310027, PR China;1. State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai, 200444, PR China;2. College of Advanced Vocational Technical, Shanghai University of Engineering Science, Shanghai, 200437, PR China;3. Panzhihua University, Panzhihua, 617000, PR China;1. School of Metallurgy, Northeastern University, Shenyang 110819, China;2. Environmental Corrosion Research Centre of Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;3. Ansteel Co., Ltd., Anshan 114021, China |
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| Abstract: | The atmospheric corrosion of pure iron and the binary alloy Fe-0.5Cu has been analyzed by a simultaneous measurement of the anodic current density of the metal dissolution and the cathodic current density of the O2 reduction reaction during several wet/dry cycles using a magnetic and a gas volumetric technique, respectively. The results show three typical stages of the atmospheric corrosion: stage 1 (wetting of a dry surface): rapid corrosion with rust reduction as cathodic process; stage 2 (wet surface): slow corrosion with O2 reduction as cathodic process; and stage 3 (drying out of the surface): very rapid corrosion with O2 reduction as the cathodic process during critical wetting of the surface. The effect of copper is restricted to stage 3, where the corrosion rate is much smaller for the Fe-0.5Cu alloy than for pure iron. Two models are discussed to explain these results. |
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