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Synthesis and properties of hydroxyapatite/CNTs composite coating on magnesium alloy by micro-arc oxidation |
XIA Chengsen1, WEN Cuilian1, ZHAN Xiaozhang1, HUANG Xiaogui1, LUO Lijin2 |
1. College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108, China;
2. Fujian Provincial Key Laboratory of Screening for Novel Microbial Products, Fujian Institute of Microbiology, Fuzhou 350007, China |
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Abstract: MAO/HA/CNTs composite coating is synthesized on magnesium alloy by micro arc oxidation (MAO) with Hydroxyapatite/CNTs (HA/CNTs) nano composite powders as additives, which is obtained by chemical precipitation method. SEM, XRD, FTIR and electrochemical workstation are adopted to investigate morphology and phase composition of as-prepared composite coating, corrosion resistance and bioactivities of samples in SBF solutions. The results show that the prepared HA/CNTs composite powders are well crystallized and without any impurities. The HA/CNTs can be deposited on the surface of samples successfully during MAO process, sealing the holes of MAO coating. Moreover, the corrosion potential of MAO/HA/CNTs modified samples is -1.50 V; the surface is deposited by a large number of submicron scale particles after soaking in SBF for 30 days, which shows better biological activity and higher corrosion resistance compared with Mg substrate and MAO modified samples.
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Received: 14 December 2015
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