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Corrosion resistance of nanostructured titanium
|Halina Garbacz 1, Marcin Pisarek 1,2, Krzysztof J. Kurzydlowski 1
1. Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland
Pure titanium is more biocompatible with human fluids and tissue than other materials but the coarse-grained titanium is too weak for implants and prostheses. The strength of pure titanium is less than half the strength of TiAl6V alloy, which is widely used for medical applications. However, the small percentages of vanadium and aluminum atoms contained in the alloy are potentially toxic. Hydrostatic extrusion (HE) allows to obtain nano-grained titanium characterized by excellent mechanical properties. The strength of pure titanium with nanosize grains is even higher than in the case of conventional TiAl6V.
The present work studies corrosion resistance of pure Ti-Grade 2 after hydrostatic extrusion. The extrusion of titanium results in the grain size below 90 nm with high-angle grain boundaries. The main purpose of the investigation is to study the effect of nanostructure on oxide layer and corrosion resistance of titanium. A detailed knowledge of chemical composition of oxide layer on a nanometer scale may help to understand corrosion resistant of Ti. Surface analytical technique like AES combined with Ar+ ion sputtering allow to investigate the interface/interphases region and examine its chemical properties. The chemistry of the oxide film formed on the metallic Ti was analysed by Auger Electron Spectroscopy (AES).
Presentation: Poster at E-MRS Fall Meeting 2006, Symposium J, by Halina Garbacz
See On-line Journal of E-MRS Fall Meeting 2006
Submitted: 2006-05-21 19:10 Revised: 2009-06-07 00:44