  Magnesium alloys have been considered to be favorable biodegradable metallic
materials used in orthopedic and cardiovascular applications. We introduce NH+2
to the AZ31 Mg alloy surface by ion implantation at the energy of 50 KeV with
doses ranging from 1e16 ions/cm2 to 1e17 ions/cm2 to improve its corrosion
resistance and biocompatibility. Surface morphology, mechanical properties,
corrosion behavior and biocompatibility are studied in the experiments. The
analysis confirms that the modified surface with smoothness and hydrophobicity
significantly improves the corrosion resistance and biocompatibility while
maintaining the mechanical property of the alloy.
