Abstract
A phosphating treatment was applied to Mg–Mn–Zn alloy in order to improve the corrosion resistance. Surface morphology and phase constitute were observed and identified by SEM, EDS, SAXS, XRD and XPS. SEM observation showed that a rough and crystalline reaction layer was formed on the surface of Mg alloy. With the increasing of phosphating time, the layer became thicker and denser. It has been showed that the reaction layer was mainly composed of brushite (CaHPO4 · 2H2O). Small amount of Zn2+ was also detected by XPS and EDS. The corrosion resistance of the phosphated samples was measured by the electrochemical polarization and the immersion test in comparison with the bare alloy. The results manifested that the corrosion resistance of Mg alloy was improved by the phosphating treatment, and the corrosion resistance increased with the increase of the phosphating time within 50 min. Immersion tests showed that the phosphate layer could protect magnesium alloy from fast corrosion. The brushite layer has been transformed into hydroxyapatite (HA) during the immersion in the simulated body fluid (SBF) solution, which suggested the brushite layer could provide good biocompatibility.
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Acknowledgements
One of authors (Erlin Zhang) would like to acknowledge the financial support from the Institute of Metal Research (IMR), Chinese Academy of Sciences (CAS), Shenyang Science and Technology Institute (Program No. 1062109-1-00), and Heilongjiang Provincial Natural Science Fund (E2007-18).
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Xu, L., Zhang, E. & Yang, K. Phosphating treatment and corrosion properties of Mg–Mn–Zn alloy for biomedical application. J Mater Sci: Mater Med 20, 859–867 (2009). https://doi.org/10.1007/s10856-008-3648-2
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DOI: https://doi.org/10.1007/s10856-008-3648-2