Preparation of bioactive TiO film on porous titanium by micro-arc oxidation

► TiO layer with high bioactivity were prepared on the porous titanium by micro-arc oxidation (MAO). ► The MAO time and applied voltage play an important role in the formation of phase of TiO crystal. ► The increases of MAO time and voltages have contributed to apatite formation apatite. ► The TiO layer prepared by MAO can be used to modify the surface of the porous titanium implants.