Electrochemical behavior and bonding strength of electrophoretically deposited HA-TiO2 nanostructured coatings

Subject Areas :

حمیدرضا فرنوش ¹

1 - هیئت علمی تمام وقت گروه مهندسی متالورژی

Received: 2015-05-13 Accepted : 2015-05-14 Published : 2016-05-21

Keywords: Corrosion, Titania, hydroxyapatite, electrophoretic deposition, Bonding Strength,

Abstract :

In the present study, the HA-TiO2 nanostructured composite coatings with 0, 10 and 20 wt% TiO2 were fabricated by electrophoretic deposition at 20 V for 3 min. Electrochemical corrosion behavior of the samples was conducted in SBF solution at 37oC by potentiodynamic polarization tests. For the effect of titania on apatite formation, electrochemical impedance spectroscopy after in-vitro tests were conducted on coatings. The variation of electrochemical parameters in equivalent circuit with different times of apatite formation was discussed for each sample. The lowest corrosion current density (icorr) and the highest corrosion potential (Ecorr) and linear polarization resistance (Rp) were obtained for HA-20 wt% TiO2 sample. The EIS analysis revealed that the total resistance of HA-20 wt% TiO2 sample is higher than that of other samples. The ICP analysis of Ca2+ concentration of SBF solution showed that the highest dissolution rate was achieved for HA sample. The concentration of Ca2+ of HA-20 wt% TiO2 sample remained almost constant after 15 days immersion which indicated the accelerated apatite formation. Moreover, the bonding strength of coating was increased by a factor of 2 with the addition of titania in HA-20 wt% TiO2 sample.

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