An analysis of the structure, properties and corrosion behavior of micro-arc coatings based on Sr-substituted hydroxyapatite deposited on MA-20 magnesium alloy substrates is performed. The coating morphology, their microstructure, phase, and elemental composition are studied by means of scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and X-ray powder diffraction (XRD). The coatings are shown to have a uniformly porous structure. The particles of Sr-hydroxyapatite 0.5-1.5 microns in size can be detected on their surfaces. Increasing the process duration from 5 to 10 minutes and the process voltage from 350 to 500 V leads to a rise in the average pore size, overall porosity, as well as coating thickness and roughness. The Sr content in all coatings is the same and amounts to 1.0 at.%. It is found out that the coating formed at a process duration of 5 minutes and a process voltage of 450 V is characterized by the highest corrosion resistance, with a corrosion current of 4.58∙10–10 A/cm2 and a polarization resistance of 1.19∙108 Ω∙cm2.
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Sedelnikova, M.B., Kashin, A.D., Luginin, N.A. et al. Micro-Arc Sr-Calcium Phosphate Coatings on Magnesium Implants: Morphology, Structure and Corrosive Behavior. Russ Phys J 66, 740–748 (2023). https://doi.org/10.1007/s11182-023-03000-4
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DOI: https://doi.org/10.1007/s11182-023-03000-4