Abstract
Newly developed Ti–10Mo–6Zr–4Sn–3Nb has fascinating mechanical properties to be used as a biomedical material. However, there is still a lack of investigation focusing on the corrosion behavior of Ti–10Mo–6Zr–4Sn–3Nb. In this work, the microstructure and corrosion behavior of as-cast Ti–10Mo–6Zr–4Sn–3Nb was investigated by optical microscopy, X-ray diffraction, and electrochemical measurements. Hank’s solution was used as the electrolyte. A classical as-cast Ti–6Al–4V was used as reference. The results showed that Ti–10Mo–6Zr–4Sn–3Nb has a higher corrosion potential and a lower corrosion current density compared with Ti–6Al–4V, indicating better corrosion resistance. However, after applying anodic potentials, Ti–10Mo–6Zr–4Sn–3Nb shows larger passivation current density in both potentiodynamic polarization and potentiostatic polarization tests. This is because more alloying elements contained in Ti–10Mo–6Zr–4Sn–3Nb trigger the production of a larger number of oxygen vacancies, resulting in a higher flux of oxygen vacancy. This finding illustrates that the passive film on Ti–10Mo–6Zr–4Sn–3Nb is less protective compared with that on Ti–6Al–4V when applying an anodic potential in their passivation range.
Highlights
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.license.Titanium (Ti) and Ti alloys have been used as biomedical materials for many years, owing to their high mechanical properties, high corrosion resistance, and excellent biocompatibility [1,2,3,4,5,6]
The results showed that α- and ω-phases are produced after aging at various temperatures
Both α- and βphases are found in the X-ray diffraction (XRD) pattern of Ti–6Al–4V, which is consistent with the results in the literature [35]
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.license (https://creativecommons.org/licenses/by/4.0/).Titanium (Ti) and Ti alloys have been used as biomedical materials for many years, owing to their high mechanical properties, high corrosion resistance, and excellent biocompatibility [1,2,3,4,5,6]. Since the 1950s, commercial pure Ti (CP–Ti) has been used as implant material, which is mainly composed of the α-phase [2]. CP–Ti has moderate strength, which may not satisfy the requirement of some hard tissues or load-bearing connective tissues [7]. (α + β)-type Ti alloys, which have higher strength, were gradually developed, such as Ti–6Al–4V, Ti–6Al–7Nb, and Ti–5Al–2.5Fe [8,9,10,11,12].
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