“…Besides the corrosion resistance and the biocompatibility, the bio-functional property has raised a great deal of concern in recent years. By means of introducing specific ions, ceramics, compounds, proteins, etc., or loading commercial drugs on surface coatings, the design of complex and composite coatings has been stimulated [ 283 , 284 , 285 , 286 , 287 ]. For instance, Fe 3 O 4 –HA–chitosan coatings can be prepared by electrophoretic deposition, which displays a superior antimicrobial efficacy than HA coating since Fe 2+ can induce the generation of H 2 O 2 , damaging the DNA and proteins in bacteria [ 288 ].…”