Corrosion behaviour in salt spray and in 3.5% NaCl solution saturated with Mg(OH)2 of as-cast and solution heat-treated binary Mg–RE alloys: RE = Ce,La, Nd,Y, Gd |
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| Affiliation: | 1. The University of Queensland, Materials Engineering, Brisbane, Qld 4072, Australia;2. Oak Ridge National Lab, Corros Sci & Technol, Oak Ridge, TN 37831-6156, USA;3. GM China Science Lab, 56 Jinwan Road, Pudong, Shanghai 201206, China;1. Center for Biomedical Materials and Tissue Engineering, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, China;2. Biomedical Engineering Research Center, Shenzhen Institute, Peking University, Shenzhen 518057, China;3. Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China;4. Center for Biomedical Materials and Engineering, Harbin Engineering University, Harbin 150001, China;5. Dongguan EONTEC Company Ltd, Dongguan 523662, China;1. The University of Queensland, Materials Engineering, School of Mechanical and Mining Engineering, Brisbane, Qld 4072, Australia;2. The University of Queensland, Centre for Advanced Materials Processing and Manufacturing (AMPAM), Brisbane, Qld 4072, Australia;1. Departamento de Ciencia de Materiales, Facultad de Ciencias Químicas, Universidad Complutense, 28040 Madrid, Spain;2. Helmholtz Zentrum Geesthacht, Magnesium Innovation Centre, Institute of Materials Research, Max-Planck-Str. 1, D-21502 Geesthacht, Germany;3. Departamento de Aleaciones Ligeras, Fundación CIDAUT, Parque Tecnológico de Boecillo, 47151 Boecillo, Valladolid, Spain;1. Shanxi Key Laboratory of Advanced Magnesium-based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China;2. CNNC Xinneng Nuclear Engineering Co., Ltd, Taiyuan 030024, PR China;1. Materials Research Centre, College of Engineering, Swansea University, Bay Campus, Crymlyn Burrows, Swansea SA1 8EN, United Kingdom;2. Department of Materials Science and Engineering, Monash University, Clayton, VIC, Australia;1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;3. Key Laboratory of Nonferrous Metal Materials Science and Engineering of Ministry of Education, Central South University, Changsha 410083, China |
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| Abstract: | Corrosion behaviour was characterised in salt spray and in 3.5% NaCl solution saturated with Mg(OH)2 of as-cast and solution heat-treated binary Mg–RE alloys. The corrosion rate in the immersion test for the solution heat-treated Mg–RE alloys was substantial, and was greater than that of high-purity Mg. These corrosion rates were probably caused by the particles in the microstructure and/or by Fe rich particles precipitated during the solution heat-treatment. The corrosion rate in the immersion tests for each as-cast Mg–RE alloy was greater than that of high-purity Mg, attributed to micro-galvanic acceleration caused by the second phase. Corrosion rates in salt spray had a general correlation with corrosion rates in the immersion tests, but there were differences. The values of apparent valence were always less than 2 consistent with Mg corrosion being only partly under electrochemical control. |
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| Keywords: | A Magnesium A Rare earth elements B Weight loss B SEM B EIS |
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