The Mechanical Properties and Corrosion Behavior of Double-Layered Nano Hydroxyapatite-Polymer Coating on Mg-Ca Alloy

Nano-hydroxyapatite (HA)/poly(epsilon-caprolactone) (PCL) coatings with thickness of about 45-55 mu m were prepared on the surface of a Mg-Ca alloy by a combination of electrochemical deposition and dip-coating methods. The results indicate that incorporation of nano-HA as an inner layer affects the porosity of the PCL-coated layer as top layer and enhances the corrosion resistance of Mg-Ca alloys. The nano-HA/PCL-coated samples showed higher R (p) (823.1 kabroken vertical bar cm(2)) and lower i (corr) (5.85E(-2) A mu A/cm(2)) compared with uncoated. Significant enhancement in the compressive strength was observed in the both nano-HA/PCL and PCL compared with uncoated samples after 10 days immersion in SBF.