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Materials 2016, 9(10), 818; doi:10.3390/ma9100818

Surface Characterization, Corrosion Resistance and in Vitro Biocompatibility of a New Ti‐Hf‐Mo‐Sn Alloy

1
Department of Biochemistry and Molecular Biology, University of Bucharest, 91‐95 Spl. Independentei, Bucharest 050095, Romania
2
Romanian Academy, Institute of Physical Chemistry “Ilie Murgulescu”, Bucharest 060021, Romania
3
Institut des Sciences Chimiques de Rennes, UMR CNRS 6226, INSA Rennes, 20 avenue des Buttes de Coësmes, Rennes 35708, France
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 6 August 2016 / Accepted: 28 September 2016 / Published: 4 October 2016
(This article belongs to the Section Biomaterials)
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Abstract

A new superelastic Ti‐23Hf‐3Mo‐4Sn biomedical alloy displaying a particularly large recovery strain was synthesized and characterized in this study. Its native passive film is very thick (18 nm) and contains very protective TiO2, Ti2O3, HfO2, MoO2, and SnO2 oxides (XPS analysis). This alloy revealed nobler electrochemical behavior, more favorable values of the corrosion parameters and open circuit potentials in simulated body fluid in comparison with commercially pure titanium (CP‐Ti) and Ti‐6Al‐4V alloy taken as reference biomaterials in this study. This is due to the favorable influence of the alloying elements Hf, Sn, Mo, which enhance the protective properties of the native passive film on alloy surface. Impedance spectra showed a passive film with two layers, an inner, capacitive, barrier, dense layer and an outer, less insulating, porous layer that confer both high corrosion resistance and bioactivity to the alloy. In vitro tests were carried out in order to evaluate the response of Human Umbilical Vein Endothelial Cells (HUVECs) to Ti‐23Hf‐3Mo‐4Sn alloy in terms of cell viability, cell proliferation, phenotypic marker expression and nitric oxide release. The results indicate a similar level of cytocompatibility with HUVEC cells cultured on Ti‐23Hf‐3Mo‐4Sn substrate and those cultured on the conventional CP‐Ti and Ti‐6Al‐4V metallic materials. View Full-Text
Keywords: biomedical alloy; native passive film; electrochemical behavior; corrosion resistance; endothelial cell behavior biomedical alloy; native passive film; electrochemical behavior; corrosion resistance; endothelial cell behavior
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ion, R.; Drob, S.I.; Ijaz, M.F.; Vasilescu, C.; Osiceanu, P.; Gordin, D.; Cimpean, A.; Gloriant, T. Surface Characterization, Corrosion Resistance and in Vitro Biocompatibility of a New Ti‐Hf‐Mo‐Sn Alloy. Materials 2016, 9, 818.

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