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Tuning of the Mg Alloy AZ31 Anodizing Process for Biodegradable Implants

  • Authors: Zaffora A.; Di Franco F.; Virtu D.; Carfi Pavia F.; Ghersi G.; Virtanen S.; Santamaria M.
  • Publication year: 2021
  • Type: Articolo in rivista
  • OA Link:


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.