Characterization of the Micro-Arc Coatings Containing β-Tricalcium Phosphate Particles on Mg-0.8Ca Alloy
Mariya B. Sedelnikova,
Ekaterina G. Komarova,
Yurii P. Sharkeev,
Tatiana V. Tolkacheva,
Vladimir V. Sheikin,
Vladimir S. Egorkin,
Dmitry V. Mashtalyar,
Aigerim A. Kazakbaeva,
Juergen Schmidt
Affiliations
Mariya B. Sedelnikova
Laboratory of Physics of Nanostructured Biocomposites, Institute of Strength Physics and Materials Science of SB RAS, Academicheskii Prospect 2/4, Tomsk 634055, Russia
Ekaterina G. Komarova
Laboratory of Physics of Nanostructured Biocomposites, Institute of Strength Physics and Materials Science of SB RAS, Academicheskii Prospect 2/4, Tomsk 634055, Russia
Yurii P. Sharkeev
Laboratory of Physics of Nanostructured Biocomposites, Institute of Strength Physics and Materials Science of SB RAS, Academicheskii Prospect 2/4, Tomsk 634055, Russia
Tatiana V. Tolkacheva
Laboratory of Physics of Nanostructured Biocomposites, Institute of Strength Physics and Materials Science of SB RAS, Academicheskii Prospect 2/4, Tomsk 634055, Russia
Vladimir V. Sheikin
Department of Pharmaceutical Technology, Siberian State Medical University, Moscovskii Tract 2, Tomsk 634050, Russia
Vladimir S. Egorkin
Department of Shipbuilding and Ocean Engineering, Far Eastern Federal University, Sukhanova Street 8, Vladivostok 690950, Russia
Dmitry V. Mashtalyar
Institute of Chemistry FEB RAS, 100-letiya Vladivostoka Prospect 159, Vladivostok 690022, Russia
Aigerim A. Kazakbaeva
Department of Strength and Design, National Research Tomsk State University, Lenina Prospect 36, Tomsk 634050, Russia
Juergen Schmidt
Department of Electrochemistry, Innovent Technology Development, Pruessingstrasse 27 B, D-07745 Jena, Germany
The characterization of the microstructure, morphology, topography, composition, and physical and chemical properties of the coatings containing β-tricalcium phosphate (β-TCP) particles deposited by the micro-arc oxidation (MAO) method on biodegradable Mg-0.8Ca alloy has been performed. The electrolyte for the MAO process included the following components: Na2HPO4·12H2O, NaOH, NaF, and β-Ca3(PO4)2 (β-TCP). The coating morphology, microstructure, and compositions have been studied using scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD). With increasing of the MAO voltage from 350 to 500 V, the coating thickness and surface average roughness of the coatings increased linearly from 6 to 150 µm and from 2 to 8 µm, respectively. The coating deposited at 350 V had more homogeneous porous morphology with numerous pores similar by sizes (2–3 µm) than the coatings formed at 450–500 V. The β-TCP isometric particles were included in the coating surface. The XRD recognized the amorphous-crystalline structure in the coatings with incorporation of the following phases: β-TCP, α-TCP, MgO (periclase) and hydroxyapatite (HA). The corrosion experiments showed that the biodegradation rate of the Mg-0.8Ca alloy coated by calcium phosphates is almost 10 times less than that of uncoated alloy.
