Formation of dicalcium phosphate dihydrate on magnesium alloy by micro-arc oxidation coupled with hydrothermal treatment |
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| Affiliation: | 1. School of Materials and Electromechanics, Jiangxi Science and Technology Normal University, Nanchang 330013, China;2. Jiangxi Key Laboratory of Surface Engineering, Jiangxi Science and Technology Normal University, Nanchang 330038, China;1. Helmholtz-Zentrum Geesthacht Centre for Materials and Coastal Research, Geesthacht, Germany;2. Nepal Academy of Science and Technology, Khumaltar, Lalitpur, Nepal;3. Biomaterials and Engineering Materials (BEM) Laboratory, James Cook University, Townsville, QLD, Australia;1. State Key Laboratory of Metastable Materials Science and Technology, College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, PR China;2. College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, PR China;3. Thermal Processing Technology Center, Illinois Institute of Technology, Chicago 60616, USA;1. School of Mechanical Engineering (SMEC), VIT University, Vellore, TN, India;2. Centre for Biomaterials Cellular and Molecular Theranostics (CBCMT), VIT University, Vellore, TN, India;3. Department of Materials Science, Indian Institute of Science (IISc), Bangalore, India;4. Electrochemical Materials Science, Central Electrochemical Research Institute (CECRI), Karaikudi, TN, India;1. School of Mechatronics Engineering, Harbin Institute of Technology, West Dazhi Road 92, 150001 Harbin, PR China;2. Institute of Materials Research, Helmholtz-Zentrum Geesthacht, Max-Plank-Str. 1, 21502 Geesthacht, Germany;3. Faculty of Engineering, University of Kiel, Kaiserstrasse 2, 24143 Kiel, Germany |
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| Abstract: | A layer containing dicalcium phosphate dihydrate (DCPD) and β-Ca3(PO4)2 was prepared on magnesium alloy by hydrothermal treatment of micro-arc oxide (MAO) layer. The biocorrosion resistance of the oxide layers before and after hydrothermal treatment was analyzed by anodic polarization and electrochemical impedance spectroscopy (EIS) in Hank’s solution. The prepared MAO layers consisted mainly of MgO and MgAl2O4, and Ca and P inside the oxide layers existed with amorphous phase. Hydrothermal treatments not only made the amorphous Ca and P change into DCPD and β-Ca3(PO4)2 crystals, but also improved the biocorrosion resistance of magnesium alloys, especially the pitting corrosion resistance. |
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| Keywords: | A. Magnesium B. Polarization B. EIS C. Oxide coatings |
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