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Yazici, Mehmet; Gulec, Ali Emre; Gurbuz, Mevlut; Gencer, Yucel; Tarakci, Mehmet
Thin solid films, 12/2017, Letnik: 644Journal Article
Magnesium-based alloys are promising materials as next generation biodegradable implants, however low corrosion resistance and inadequate mechanical properties are limiting their application as a biodegradable implant material. In this study, Mg-Sr-Ca ternary alloys were prepared in a vacuum/atmosphere controlled furnace and coated by microarc oxidation (MAO) process for 5min to decrease the degradation rate and enhance the biocompatibility. Moreover, Ag doped Hydroxyapatite nano powder (Ag-HA) was also added to alkaline MAO solution by amount of 1 and 10g/l to improve the antibacterial properties while enhancing their bioactivity in a one single process. XRD, SEM-EDS, FTIR spectroscopy, simulated body fluid (SBF) immersion and antibacterial tests were employed for the characterization of the coated alloys. The results showed that, the addition of more Ag-HA increased the HA formation both before and after SBF immersion test and enhanced their antibacterial properties. However, Ag-HA addition decreased the corrosion resistance of the coated alloys in SBF compared to Ag-HA free coating. The results indicated that the present Ag-HA nano powder added MAO coating is a good combination to enhance the corrosion resistance, bioactivity and the antibacterial properties of Mg based biodegradable alloys. •Silver doped Hydroxyapatite (Ag-HA) addition improved antibacterial properties.•HA morphology is related to Ag-HA content in the electrolyte.•The increase of Ag-HA content in the electrolyte increased the HA formation.•Increasing the Ag-HA concentration resulted in the Ca/P ratio approaching to 1.67.
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