RT info:eu-repo/semantics/article
T1 Improvement of the corrosion resistance of biomedical Zr-Ti alloys using a thermal oxidation treatment
A1 Souto, Ricardo Manuel
A1 Izquierdo Pérez, Javier
A1 Mareci, Daniel
A1 Bolat, Georgiana
A1 Santana, Juan José
A1 Rodríguez Raposo, Raquel
A1 Fernández-Mérida, Luis
A1 Burtan, Liviu
A1 Trincă, Lucia Carmen
K1 Zr-Ti binary alloys
K1 biomaterial
K1 surface modification
K1 corrosion resistance
K1 electrochemical techniques
AB Binary Zr-Ti alloys spontaneously develop a tenacious and compact oxide layer whentheir fresh surface is exposed either to air or to aqueous environments. Electrochemical impedancespectroscopy (EIS) analysis of Zr-45Ti, Zr-25Ti, and Zr-5Ti exposed to simulated physiologicalsolutions at 37  C evidences the formation of a non-sealing bilayer oxide film that accounts for thecorrosion resistance of the materials. Unfortunately, these oxide layers may undergo breakdownand stable pitting corrosion regimes at anodic potentials within the range of those experiencedin the human body under stress and surgical conditions. Improved corrosion resistance has beenachieved by prior treatment of these alloys using thermal oxidation in air. EIS was employed tomeasure the corrosion resistance of the Zr-Ti alloys in simulated physiological solutions of a widepH range (namely 3   pH   8) at 37  C, and the best results were obtained for the alloys pre-treatedat 500  C. The formation of the passivating oxide layers in simulated physiological solution wasmonitored in situ using scanning electrochemical microscopy (SECM), finding a transition from anelectrochemically active surface, characteristic of the bare metal, to the heterogeneous formation ofoxide layers behaving as insulating surfaces towards electron transfer reactions.
YR 2020
FD 2020
LK http://riull.ull.es/xmlui/handle/915/18952
UL http://riull.ull.es/xmlui/handle/915/18952
LA en
DS Repositorio institucional de la Universidad de La Laguna
RD 26-dic-2024