Anticorrosive coatings on magnesium MA8 alloy containing carbonate-substituted hydroxyapatite
Keywords:
magnesium, hydroxyapatite, plasma electrolytic oxidation, bioresorbable implants, electrochemical impedance spectroscopyAbstract
The results of the optimization of the method for formation of bioactive calcium-phosphate coatings on bioresorbable magnesium substrate are presented. The coatings obtained by plasma electrolytic oxidation are positioned as bioresorbable and are used as anticorrosive, providing the controlled dissolution of a metal (magnesium) implant in the human body environment. A magnesium alloy of the Mg–Mn–Ce system was used as a substrate for the formed protective layers. The morphology, phase and elemental composition of the protective layers formed on the metal surface have been studied. The comparative analysis of the physicochemical properties of coated samples indicates the possibility of varying the protective characteristics and corrosion damage of the substrate material due to the use of carbonate-substituted hydroxyapatite, which is characterized by increased solubility.