In vitro and in vivo corrosion, mechanical properties and biocompatibility evaluation of MgF-coated Mg-Zn-Zr alloy as cancellous screws.

Magnesium (Mg) and its alloys as biodegradable materials have received much attention in the orthopedics applications; however, the corrosion behavior of these metals in vivo remains challenging. In this work, a dense and nanoscale magnesium fluoride (MgF) coating was deposited on the surface of Mg-Zn-Zr (MZZ) alloy cancellous screw. The MZZ cancellous screw with MgF coating maintained an integrated shape and high yield tensile stress after 30days immersion in SBF, comparing with the bare screw.