Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/70193
Title: Improvement of the corrosion resistance of biomedical zr-ti alloys using a thermal oxidation treatment
Authors: Izquierdo, Javier
Mareci, Daniel
Bolat, Georgiana
Santana, Juan J. 
Rodríguez Raposo,Raquel 
Fernández-Mérida, Luis C.
Burtan, Liviu
Trincă, Lucia C.
Souto, Ricardo M.
UNESCO Clasification: 3303 ingeniería y tecnología químicas
Keywords: Biomaterial
Corrosion Resistance
Electrochemical Techniques
Surface Modification
Zr-Ti Binary Alloys
Issue Date: 2020
Project: Romanian National Authority for Scientific Research (CNCS-UEFISCDI, Bucharest, Romania; project no. PN-II-IDPCE-2011-3-0218)
CTQ2016-80522-P
Journal: Metals 
Abstract: Binary Zr-Ti alloys spontaneously develop a tenacious and compact oxide layer when their fresh surface is exposed either to air or to aqueous environments. Electrochemical impedance spectroscopy (EIS) analysis of Zr-45Ti, Zr-25Ti, and Zr-5Ti exposed to simulated physiological solutions at 37 °C evidences the formation of a non-sealing bilayer oxide film that accounts for the corrosion resistance of the materials. Unfortunately, these oxide layers may undergo breakdown and stable pitting corrosion regimes at anodic potentials within the range of those experienced in the human body under stress and surgical conditions. Improved corrosion resistance has been achieved by prior treatment of these alloys using thermal oxidation in air. EIS was employed to measure the corrosion resistance of the Zr-Ti alloys in simulated physiological solutions of a wide pH range (namely 3 ≤ pH ≤ 8) at 37 °C, and the best results were obtained for the alloys pre-treated at 500 °C. The formation of the passivating oxide layers in simulated physiological solution was monitored in situ using scanning electrochemical microscopy (SECM), finding a transition from an electrochemically active surface, characteristic of the bare metal, to the heterogeneous formation of oxide layers behaving as insulating surfaces towards electron transfer reactions.
URI: http://hdl.handle.net/10553/70193
ISSN: 2075-4701
Source: Metals [2075-4701],v. 10 (2), 166.
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