Abstract
This study is a comparison between the effect of sintering and alkaline post-treatment techniques on calcium phosphate-coated Co–Cr–Mo alloy in terms of electrochemical corrosion behavior and wettability. The Co–Cr–Mo substrates were electrophoretically coated by calcium phosphate in a solution of Ca(NO3) · 4H2O and NH4H2PO4. The sintering and alkaline post-treatment techniques were then conducted to convert an as-deposited dicalcium phosphate dihydrate phase to crystalline hydroxyapatite (HA). The coated layers were characterized in terms of phase, crystallinity and composition using X-ray diffraction, Fourier transform infrared spectroscopy and energy-dispersive spectroscopy. In addition, morphology and thickness of coated layers were evaluated using a scanning electron microscope. The results indicate HA-coated samples with a sintering post-treatment technique exhibit more improvement in corrosion parameters, such as corrosion potential (E corr) and corrosion current density (I corr), but lower enhancement in hydrophilicity. However, the HA-coated samples with an alkaline post-treatment technique reveal higher hydrophilicity with lower improvement in corrosion resistance.
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Shirdar, M.R., Izman, S., Taheri, M.M. et al. Effect of Post-Treatment Techniques on Corrosion and Wettability of Hydroxyapatite-Coated Co–Cr–Mo Alloy. Arab J Sci Eng 40, 1197–1203 (2015). https://doi.org/10.1007/s13369-015-1611-3
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DOI: https://doi.org/10.1007/s13369-015-1611-3