Corrosion resistance of high pressure torsion obtained commercially pure titanium in acidic solution

• Main Authors: Dragana R. Barjaktarević, Ivana D. Dimić, Ivana Lj. Cvijović-Alagić, Marko P. Rakin, Đorđe N. Veljović
• Format: Article
• Language: English
• Published: Faculty of Mechanical Engineering in Slavonski Brod, Faculty of Electrical Engineering in Osijek, Faculty of Civil Engineering in Osijek 2017-01-01
• Series: Tehnički Vjesnik
• Subjects: artificial saliva; corrosion resistance; electrochemical measurements; ultrafine-grained titanium
• Online Access: https://hrcak.srce.hr/file/280257

The enhancement of commercially pure titanium (cpTi) mechanical properties, which is required for its medical application, can be achieved by grain refinement obtained by severe plastic deformation. In addition to mechanical properties improvement, excellent corrosion resistance of ultrafine-grained (UFG) cpTi in contact with human body fluids is required. Therefore, the aim of this study was to estimate electrochemical behavior of UFG cpTi obtained by high pressure torsion (HPT) under a pressure of 7,8 GPa at room temperature and up to 5 rotations. Electrochemical measurements were performed in artificial saliva at 37°C in order to simulate oral environment, since development of UFG cpTi is primarily aimed for dental implant applications. Electrochemical behavior of UFG cpTi was investigated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization. The obtained results indicate that HPT process, through significant grain size reduction, increases corrosion resistance of cpTi.