Abstract
Coatings were grown on the AZ31 Mg alloy by a hard anodizing process in the hot glycerol phosphate-containing electrolyte. Anodizing conditions were optimized, maximizing corrosion resistance estimated by impedance measurements carried out in Hank’s solution at 37 °C. A post anodizing annealing treatment (350 °C for 24 h) allowed us to further enhance the corrosion resistance of the coatings mainly containing magnesium phosphate according to energy-dispersive X-ray spectroscopy and Raman analyses. Gravimetric measurements revealed a hydrogen evolution rate within the limits acceptable for application of AZ31 in biomedical devices. In vitro tests demonstrated that the coatings are biocompatible with a preosteoblast cell line.
Highlights
Metallic biomaterials are nowadays widely used in human body as implants
Anodizing of AZ31 Mg alloys was performed in hot glycerol (HG) electrolyte containing K2HPO4 and K3PO4 salts to grow a corrosion resistant and biocompatible coating that can be used in biomedical devices
The as-formed coatings were characterized in Hank’s solution (HS) in order to verify their compatibility with the human body environment
Summary
Metallic biomaterials are nowadays widely used in human body as implants (e.g., artificial joints, stents, and bone plates). There are many coating technologies which can be used to coat the magnesium substrate,[10] such as chemical conversion coating,[11−13] physical vapor deposition,[14,15] laser surface treatment,[15,16] and anodic oxidation.[17−20] Among these technologies, the latter is one of the most effective and popular methods, even if the growth of protective anodic layers on Mg and Mg alloys is difficult due to the unfavorable Pilling−Bedworth ratio (PBR) for MgO.
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