Abstract
To improve the corrosion resistance of magnesium, the ceramic coatings were prepared on Mg-4.71Zn-0.6Ca alloy by micro-arc oxidation (MAO) with different current modes. The microstructure, thickness, and composition of the coatings were characterized by scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectrometer (EDS) and X-ray diffraction (XRD). The electrochemical test was used to evaluate the corrosion behaviors of the Mg alloy, and the degradation rate of Mg alloy was investigated by immersion tests in Hank's solution, and the corrosion products were analyzed by EDS, XRD and fourier transform infrared spectrometer (FT-IR). The experimental results showed that the corrosion resistance of Mg-4.71Zn-0.6Ca alloy was significantly improved by MAO treatment, and the MAO Mg alloy prepared under hybrid mode exhibited the better corrosion resistance than other two modes, and the bioactivity of magnesium alloy was also improved. The MAO Mg-4.71Zn-0.6Ca alloy that prepared under hybrid mode had the potential to be served on bone repair and implant materials.
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