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. 2021 Oct 9;14(20):5934.
doi: 10.3390/ma14205934.

New Titanium Alloys, Promising Materials for Medical Devices

Madalina Simona Baltatu  1 , Petrica Vizureanu  1 , Andrei Victor Sandu  1   2 , Nestor Florido-Suarez  3 , Mircea Vicentiu Saceleanu  4 , Julia Claudia Mirza-Rosca  3
Affiliations

New Titanium Alloys, Promising Materials for Medical Devices

Madalina Simona Baltatu et al. Materials (Basel). .

Abstract

Titanium alloys are used in medical devices due to their mechanical properties, but also for their corrosion resistance. The natural passivation of titanium-based biomaterials, on the surface of which a dense and coherent film of nanometric thickness is formed, composed mainly of TiO2, determines an apparent bioactivity of them. In this paper, the method of obtaining new Ti20MoxSi alloys (x = 0.0, 0.5, 0.75, and 1.0) is presented, their microstructure is analyzed, and their electrochemical responses in Ringer´s solution were systematically investigated by linear polarization, cyclic potential dynamic polarization, and electrochemical impedance spectroscopy (EIS). The alloys corrosion resistance is high, and no evidence of localized breakdown of the passive layer was observed. There is no regularity determined by the composition of the alloys, in terms of corrosion resistance, but it seems that the most resistant is Ti20Mo1.0Si.

Keywords: Ti–Mo–Si alloys; biomedical alloys; corrosion resistance.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Optical microstructure of the alloys at 100X. (a) Ti20Mo, (b) Ti20Mo0.5Si, (c) Ti20Mo0.75Si, (d) Ti20Mo1.0Si.
Figure 2
Figure 2
XRD patterns Ti–Mo–Si alloys: S1—Ti20Mo, S2—Ti20Mo0.5Si, S3—Ti20Mo0.75Si, S4—Ti20Mo1.0Si.
Figure 3
Figure 3
Linear polarization curves in semi-logarithmic coordinates for Ti–Mo–Si alloys in Ringer’s solution.
Figure 4
Figure 4
Corrosion parameters obtained from cyclic polarization curves in Ringer’s solution.
Figure 5
Figure 5
(a) Nyquist,(b) Bode—IZI and (c) Bode—phase diagrams for Ti20Mo, Ti20Mo0.5Si, Ti20Mo0.75Si and Ti20Mo1.0Si alloys in Ringer’s solution.
Figure 6
Figure 6
The equivalent circuit and the solution–alloy interface for the following: (a) Ti20Mo, Ti20Mo0.5Si, Ti20Mo0.75 Si; (b) Ti20Mo1.0Si.
See this image and copyright information in PMC

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