Anodizing-induced evolution of nanostructural surface morphologies in Ti-10Mo-xSi alloys for enhanced corrosion resistance

Anodizing-induced evolution of nanostructural surface morphologies in Ti-10Mo-xSi alloys for enhanced corrosion resistance

β-type Ti alloys composed of non-toxic alloying elements (Ta, Mo, Nb and Si) are highly considered for biomedical applications due to their excellent mechanical properties and better biocompatibility compared to other implant materials. The performance of Ti alloy-based implants is also dependent on...

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Bibliographic Details
Published in:Surface & coatings technology Vol. 377; p. 124924
Main Authors: Nascimento, D.S., Matos, G.R.L., Moreira, F.K.V., Macedo, M.C.S.S., Souza, S.A.
Format: Journal Article
Language:English
Published: Lausanne Elsevier B.V 15-11-2019
Elsevier BV
Subjects:
Alloying elements
Anodizing
Anodizing process
Beta phase
Biocompatibility
Biomedical materials
Corrosion
Corrosion resistance
Corrosion resistant alloys
Electrochemical corrosion
Grain size
Mechanical properties
Metallography
Molybdenum
Morphology
Nanotubes
Niobium
Porosity
Silicon base alloys
Surface layers
Surface properties
Surgical implants
Tantalum
Titanium base alloys
Titanium dioxide
Transplants & implants
Metallography
Corrosion
Anodizing process
Nanotubes
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Summary:β-type Ti alloys composed of non-toxic alloying elements (Ta, Mo, Nb and Si) are highly considered for biomedical applications due to their excellent mechanical properties and better biocompatibility compared to other implant materials. The performance of Ti alloy-based implants is also dependent on their surface properties, which can be optimized by nanotube growth through anodizing treatment. In this study, β-type Ti-10Mo-(0, 0.5, 1.5)Si alloys were produced, treated thermally and further anodized at 5, 10, 20 and 40 V for 6 h aiming at evaluating the effects of the Si concentration and anodizing voltage on the formation of nanostructured surface layers and corrosion resistance of Ti alloys. The inclusion of Si reduced the ω-phase precipitation extent, thus making the β-phase more stable, but it led to intermetallic Ti3Si phase formation. The Si addition also refined the β-phase grain size. The best corrosion resistance in SBF was obtained for the Ti alloys included with 0.5 wt% of Si. The best TiO2 nanotube growth condition was found to be at anodizing voltages of 10 V, regardless of the Si concentration. Nevertheless, the alloys with nanopore-assembled surface obtained at 5 V were more efficient against electrochemical corrosion. •For all anodized Ti-10Mo-xSi alloys, the best TiO2 nanotube growth condition was found to be at 10V.•The non-anodized and anodized Ti-10Mo-0.5Si alloys exhibiting the best performance in corrosion protection.•The formation of Ti3Si phase and grain refinement by increasing Si content reduced the corrosion resistance of the alloys.•The nanopore-assembled surface was more efficient against to electrochemical corrosion than the nanotube-covered surface.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2019.124924