Abstract
Abstract The corrosion resistance of new Ti–15Zr–5Nb alloy was correlated with its microstructure, surface structure and composition of its native passive film and of film formed after immersion for 1500 h in Ringer solutions of different pH values. Nobler passive behaviour of alloy in comparison with Ti and similar ternary alloy was determined due to its more compact passive film (containing TiO2, Ti2O3, ZrO2 and Nb2O5). EIS spectra depicted predominantly capacitive behaviour, passive film formed by two layers. After long-term immersion, XPS, Raman spectroscopy, SEM and EDX revealed the same protective oxides and Ca3(PO4)2 compound (precursor of hydroxyapatite) deposited on alloy surface.
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