Influence of dicalcium phosphate dihydrate coating on the <Emphasis Type="Italic">in vitro</Emphasis> degradation of Mg-Zn alloy |
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| Authors: | Shao-Xiang Zhang Jia-Nan Li Yang Song Chang-Li Zhao Xiao-Nong Zhang |
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| Affiliation: | 1.State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai,China;2.Key Laboratory of Special Inorganic Coating, Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai,China |
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| Abstract: | To reduce the degradation rate and further to improve the biocompatibility of magnesium alloy, dicalcium phosphate dihydrate (CaHPO4·2H2O, DCPD) has been fabricated on a kind of magnesium-zinc alloy by way of electrodeposition method. The experimental results of XRD, SEM and EDS showed that the electrodeposited coating on the Mg-Zn alloy mainly contains the flake-like DCPD, along with some octacalcium phosphate (Ca8(HPO4)2(PO4)4·4H2O, OCP). After the in vitro degradation of the coated alloy in modified-simulated body fluid (m-SBF), it was proved that the coating could reduce the degradation rate effectively, and the samples were covered by calcium phosphate salts with a higher Ca/P ratio. Therefore, it indicates that compared with the bare alloy, the DCPD coating rendered a more biocompatible surface, and is a promising coating candidate for biomedical magnesium materials. |
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