Nanocrystalline MgO particles with a cubic phase structure have been synthesised via ionic liquid (IL)-assisted solid-state reaction. The necessary characterisations such as XRD, EDS, FTIR, SEM and TEM have been carried out to investigate the obtained materials. The results show that the synthesised MgO consisted of a large quantity of sphere-like nanocrystals with average particle size of ∼26.3 nm, and had high crystallinity and narrow particle size distribution. Compared with solid-state reaction method, this method has the advantages of fast reaction rate and high yield. This indicates that IL-assisted solid-state reaction appears to be a promising method for the manufacture of nanometre MgO in industry.
MgF 2 /MgO composite coatings were prepared on the surface of porous magnesium by chemical vapor deposition (CVD) techniques in a mixed atmosphere of argon and 1,1,1,2-tetrafluoroethane (HFC-134a). The morphology, elemental composition and phase composition of the composite coatings were characterized by using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD), and the biocorrosion resistance of the coatings in simulated body fluid (SBF) was investigated by immersion and electrochemical tests. The characterization analysis showed that a dense MgF 2 /MgO composite coating with some small pores was formed. The content of MgF 2 in the coating increased with the increase of HFC-134a concentration in the mixed atmosphere, reaction time and temperature. The content of MgO decreased with the increase of the concentration of HFC-134a and reaction time. Immersion tests indicated that MgF 2 /MgO composite coatings obviously reduced the degradation rate of porous magnesium in simulated body fluid, and the higher the fluorine content in the coating, the smaller the degradation rate of porous magnesium. Electrochemical test demonstrated that MgO/MgF 2 coated porous magnesium exhibited a higher biocorrosion resistance than porous magnesium. These results suggest that the MgF 2 /MgO coated porous magnesium possesses suitable corrosion behavior for the application as biodegradable implant material.
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