An investigation on microstructure and corrosion behavior of AZ31 Mg alloy

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    An investigation on microstructure and corrosion behavior of AZ31 Mg alloy coated by fluoride-doped Hydroxyapatite Coating

    Mohsen Saremi , Samaneh NikooSefat

    Mg and its alloys are potentially biodegradable implant materials due to their biological and
    mechanical performances. But the high corrosion rate of Mg may result in abrupt failure of
    the implant. It is believed that fluoride-doped HA coating on Mg alloys can provide early
    stability and long-term performances for both the substrate and coating. In this study,
    fluoride-doped HA is applied on AZ31 Mg substrate by cathodic deposition. The morphology
    and composition of coating were investigated by scanning electron microscope and X-Ray
    diffractometric technique. It revealed that the dense and uniform FHA coating could provide
    better apatite-like layer adsorption in comparison with pure HA. Uniformity and fine grain
    deposits are obtained at medium direct voltage i.e. -2V at room temperature. The uniformity
    of the coating is very important because the presence of any flaw and break in the coating
    creates an active anode at which corrosion concentrates. Electrochemical polarization and EIS
    tests showed that the corrosion resistance of FHA coating has increased significantly due to
    the better adhesion of the coating and a stable interface. Thus, Mg alloy coated with fluoridedoped HA coating can be a better candidate as a biodegradable bone implant with improved corrosion behavior and biocompatibility.

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