Preparation of titanium oxide and hydroxyapatite on Ti–6Al–4V alloy surface and electrochemical behaviour in bio-simulated fluid solution

•Nanoporous TiO2 layer on Ti–6Al–4V alloy was electrosynthesized.•Thickness of the TiO2 layer varies from 380 nm to 615 nm.•Hydroxyapatite film is electrodeposited onto TiO2 layer at a Ca/P ratio of 0.83.•The corrosion performance of alloy was enhanced by electrochemical modified surface.

In order to improve the bonding strength between hydroxyapatite (HA) coating and Ti–6Al–4V substrate, a uniform titanium oxide film was obtained by controlled anodic oxidation. After that an alkaline treatment with NaOH solution was used to make them more bioactive. Finally hydroxyapatite coating has been prepared on Ti–6Al–4V substrate through electrochemical deposition. Comparative electrochemical behaviour of untreated and surface modified Ti–6Al–4V alloy, in bio-simulated fluid solution was investigated by electrochemical techniques. SEM was used to observe the morphology of modified surfaces and the thicknesses of the oxide films prepared were evaluated on the cross-sections of the samples using SEM–FIB.

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