New Titanium Alloys, Promising Materials for Medical Devices

Madalina Simona Baltatu; Petrica Vizureanu; Andrei Victor Sandu; Nestor Florido-Suarez; Mircea Vicentiu Saceleanu; Julia Claudia Mirza-Rosca

doi:10.3390/ma14205934

New Titanium Alloys, Promising Materials for Medical Devices

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

Authors

Madalina Simona Baltatu¹, Petrica Vizureanu¹, Andrei Victor Sandu^{1

2}, Nestor Florido-Suarez³, Mircea Vicentiu Saceleanu⁴, Julia Claudia Mirza-Rosca³

Affiliations

¹ Department of Technologies and Equipments for Materials Processing, Faculty of Materials Science and Engineering, Gheorghe Asachi Technical University of Iaşi, Blvd. Mangeron, No. 51, 700050 Iasi, Romania.
² Romanian Inventors Forum, Iasi. Sf. P. Movila 3, 700089 Iasi, Romania.
³ Mechanical Engineering Department, Las Palmas de Gran Canaria University, 35017 Tafira, Spain.
⁴ Neurosurgery Department, Faculty of Medicine, Lucian Blaga University, 550024 Sibiu, Romania.

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.