RT Journal Article
T1 Corrosion and Tribocorrosion Behavior of Ti-40Nb and Ti-25Nb-5Fe Alloys Processed by Powder Metallurgy
A1 Çaha, Ihsan
A1 Alves, Alexandra
A1 Chirico Rodríguez, Caterina del Carmen
A1 Pinto, Ana
A1 Tsipas, Sophia Alexandra
A1 Gordo Odériz, Elena
A1 Toptan, Fatih
AB The requirement of good mechanical properties, lower Young's modulus, superior corrosion resistance, and excellent biocompatibility makes beta-type titanium alloys attractive materials for orthopedic implants. In this study, Ti-25Nb-5Fe and Ti-40Nb beta-type titanium alloys were designed and produced by powder metallurgy route using titanium hydride, niobium, and iron powders. The effect of sintering conditions on microstructure, corrosion, and tribocorrosion behavior was explored. Electrochemical behavior was investigated in saline solution (9 g/L NaCl) at body temperature by using potentiodynamic polarization and electrochemical impedance spectroscopy. Tribocorrosion behavior was evaluated by reciprocating against an alumina ball at open circuit potential, as well, under anodic and cathodic potentiostatic conditions in saline solution (9 g/L NaCl) at body temperature. The physical, electrochemical, and tribo-electrochemical behaviors of both alloys were improved with increasing sintering time at 1250 °C from 2 to 4 hours and decreasing Fe particle size for Ti-25Nb-5Fe alloy. Degradation under tribocorrosion conditions was mainly governed by mechanical wear on Ti-25Nb-5Fe alloy; however, Ti-40Nb alloy exhibited an antagonistic effect between corrosion and wear during testing under anodic applied potential due to the formation of a denser tribolayer.
PB Springer
SN 1073-5623
YR 2020
FD 2020-06
LK https://hdl.handle.net/10016/32598
UL https://hdl.handle.net/10016/32598
LA eng
NO This work is supported by FCT with the reference Project UID/EEA/04436/2019, together with M-ERA-NET/0001/2015, as well, by MINECO (Spain) through the program PCIN-2016-123 and the Ramón y Cajal Project RYC-2014-15014. I. Caha is grateful for the financial support through a Ph.D. Grant under the NORTE-08-5369-FSE-000012 Project.
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RD 27 jul. 2024