Corrosion resistance of nanostructured titanium
H Garbacz1, M Pisarek, K J Kurzydłowski
1Warsaw University of Technology, Faculty of Materials Science and Technology, Woloska 141, 02-507 Warsaw, Poland. haga@inmat.pw.edu.pl
Biomolecular Engineering
|September 25, 2007
Summary
Pure nanomaterial titanium (Ti) Grade 2 exhibited slightly lower corrosion resistance in NaCl solution compared to its micro-sized counterpart. Hydrostatic extrusion did not alter the oxide layer thickness on the nano-Ti samples.
Area of Science:
- Materials Science
- Corrosion Science
- Nanotechnology
Background:
- Pure titanium (Ti) Grade 2 with nanometric grain size (<90 nm) was studied.
- Hydrostatic extrusion is a severe plastic deformation process.
- Understanding the corrosion behavior of nanostructured metals is crucial for their application.
Purpose of the Study:
- To evaluate the corrosion resistance of pure nano-Ti Grade 2 after hydrostatic extrusion.
- To investigate the influence of nanometric grain size on oxide layer formation and corrosion behavior.
- To compare the corrosion performance of nano-Ti with micro-sized Ti.
Main Methods:
- Surface analysis using Auger Electron Spectroscopy (AES) combined with Ar(+) ion sputtering.
- Characterization of oxide layer thickness and chemical composition.
- Corrosion testing in a sodium chloride (NaCl) solution.
Main Results:
- The grain size of the titanium substrate did not affect the thickness of the oxide layer formed.
- The oxide layer thickness on nano-Ti samples remained consistent at approximately 6 nm, both before and after hydrostatic extrusion.
- Nano-Ti Grade 2 displayed slightly reduced corrosion resistance compared to titanium with micrometric grain size when tested in NaCl solution.
Conclusions:
- Hydrostatic extrusion does not significantly alter the native oxide layer thickness on pure nano-Ti Grade 2.
- Nanostructured titanium (Ti) Grade 2 exhibits a marginally lower corrosion resistance in NaCl solution than its microcrystalline counterpart.
- The findings suggest that while nanostructuring affects material properties, its impact on the initial oxide layer and corrosion resistance in this specific environment warrants further investigation.
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