Anticorrosion Coatings Obtained by Plasma Electrolytic Oxidation on Implant Metals and Alloys
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Development of biodegradable implants for treatment of complex bone fractures has recently become oneof the priority areas in biomedical materials research. Multifunctional corrosion resistant and bioactive coatingscontaining hydroxyapatite Ca10(PO4)6(OH)2 and magnesium oxide MgO were obtained on Mg-Mn-Ce magnesiumalloy by plasma electrolytic oxidation. The phase and elemental composition, morphology, and anticorrosionproperties of the coatings were investigated by scanning electron microscopy, energy dispersive spectroscopy,potentiodynamic polarization, and electrochemical impedance spectroscopy. The PEO-layers were post-treatedusing superdispersed polytetrafluoroethylene powder. The duplex treatment considerably reduced the corrosionrate (>4 orders of magnitude) of the magnesium alloy. The use of composite coatings in inducing bioactivityand controlling the corrosion degradation of resorbable Mg implants are considered promising. We alsoapplied the plasma electrolytic oxidation method for the formation of the composite bioinert coatings onthe titanium nickelide surface in order to improve its electrochemical properties and to change the morphologicalstructure. It was shown that formed coatings significantly reduced the quantity of nickel ions released intothe organism.
Abstract
Development of biodegradable implants for treatment of complex bone fractures has recently become oneof the priority areas in biomedical materials research. Multifunctional corrosion resistant and bioactive coatingscontaining hydroxyapatite Ca10(PO4)6(OH)2 and magnesium oxide MgO were obtained on Mg-Mn-Ce magnesiumalloy by plasma electrolytic oxidation. The phase and elemental composition, morphology, and anticorrosionproperties of the coatings were investigated by scanning electron microscopy, energy dispersive spectroscopy,potentiodynamic polarization, and electrochemical impedance spectroscopy. The PEO-layers were post-treatedusing superdispersed polytetrafluoroethylene powder. The duplex treatment considerably reduced the corrosionrate (>4 orders of magnitude) of the magnesium alloy. The use of composite coatings in inducing bioactivityand controlling the corrosion degradation of resorbable Mg implants are considered promising. We alsoapplied the plasma electrolytic oxidation method for the formation of the composite bioinert coatings onthe titanium nickelide surface in order to improve its electrochemical properties and to change the morphologicalstructure. It was shown that formed coatings significantly reduced the quantity of nickel ions released intothe organism.
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