Abstract
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.
Highlights
Metallic biomaterials are the most commonly used materials in the traumatology, orthopedics, dentistry, and cardiology
The morphology and microstructure of the calcium phosphate (CaP) coatings on the Mg–0.8 wt % Ca (Mg)-0.8Ca alloy were examined by scanning with electron microscopy
The study of the microstructure, morphology, topography, composition, and physical and chemical properties of the CaP coatings containing β-tricalcium phosphate (β-TCP) particles deposited by the micro-arc oxidation (MAO) method under varied voltages of 350–500 V on biodegradable Mg alloy was performed
Summary
Metallic biomaterials are the most commonly used materials in the traumatology, orthopedics, dentistry, and cardiology. Due to their good mechanical properties, metals and alloys have great advantages in comparison with ceramics, polymers and polymer/ceramic composites [1]. Metals 2018, 8, 238 of metallic implants is limited by the necessity of revision surgery for implant recovery. In this case, biodegradable materials and alloys that dissolve in the human organism are perspective biomaterials of advanced generation [2,3]. Biodegradable implants stabilize and support the healing process temporarily and are dissolved by chemical and biological procedures in the body after healing, which supersedes their removal [5]
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