Characterization and corrosion resistance of plasma sprayed HA and HA–SiO2 coatings on Ti–6Al–4V

Abstract The objective of this study is to evaluate corrosion resistance of plasma sprayed hydroxyapatite (HA) and hydroxyapatite–silicon oxide (SiO 2 ) coated Ti–6Al–4V substrate. In HA–SiO 2 coatings, 10 wt.% SiO 2 was mixed with HA. The feedstock and coatings were characterized by X-ray diffraction and scanning electron microscopy/energy dispersive X-ray spectroscopy. The corrosion resistance was determined for the uncoated and two coatings. The corrosion resistance of the Ti–6Al–4V was found more after the deposition of the HA + 10 wt.% SiO 2 rather than after HA coating and uncoated. Both HA, as well as, HA + 10 wt.% SiO 2 coatings were crack free after 24 h dipping in Ringer's solution for electrochemical corrosion.

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