Controlling the Biodegradation Rate of AZ31 with Biomimetic Apatite Coating

摘要

Magnesium alloys have the potential as a biodegradable material for orthopedic applications. However, severely corrosion in a physiological environment limits the clinical application of Mg alloys. Hydroxyapatite is the main composition of natural bone, it has excellent bioactivity and osteoconductivity. In this paper, the samples of AZ31 were ultrasonically cleaned using distilled water, and then the coating was formed on the surfaces of the samples by biomimetic process. The samples were subsequently immersed in the simulated body fluid (SBF) for the degradation test. The coatings were characterized by XRD, EDS and SEM. The results showed that hydroxyapatite (HA) coating was formed on the surface of AZ31 after 24 h by biomimetic process; the HA coating greatly decreased the corrosion rate of AZ31 substrate; the degradation rate of samples can be controlled by closely adjusting the hydroxyapatite coating.