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.

hydroxyapatite  /  CNTs  /  magnesium alloy  /  micro-arc oxidation  /  bioactive coating