Corrosion Resistance and Biocompatibility of Fe-Based Film on Az31 Mg-Alloy

Abstract

The rapid corrosion rate of magnesium alloy limits its application in the field of biomaterials. In this study, a Fe-based film was successfully prepared on AZ31 magnesium alloy by magnetron sputtering. The morphology, composition, corrosion resistance and biocompatibility of Fe-based film were studied. The results show that the Fe-based film shows good corrosion resistance. Compared with the bare AZ31 alloy, the corrosion current density of Fe/PTFE/AZ31 was decreased by nearly 2 orders of magnitude. After 168 h immersion in simulated body fluid (SBF), the Fe-based film preserved a complete morphology and induced less variation in pH value of SBF. Furthermore, the significant increased viability rate of endothelial cells proved the good biocompatibility of the Fe-based film.

Keywords: Magnesium alloy, Fe, film, Magnetron sputtering, corrosion resistance, Biocompatibility