Effects of Hf content on electrochemical corrosion behavior of biomedical Ti-30Nb-1Fe and Ti-40Nb alloys
Date Issued
2010
Date
2010
Author(s)
Chiou, Shoa-Hui
Abstract
The purpose of this research is to investigate the electrochemical corrosion behaviros of Ti-30Nb-1Fe-xHf and Ti-40-Nb-yHf (x, y= 1, 2, 3, and 4 wt%) alloys in 0.9%NaCl (pH=5.6) and 0.2%NaF (pH=4.0) solutions, utilizing potentiodynamic polarization and immerse tests. After testing, the surfaces of the alloys were examined by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results reveal that the corrosion resistance of Ti-30Nb-1Fe-1Hf alloy is the best among Ti-30Nb-1Fe-xHf alloys studied. Whereas, for Ti-40-Nb-yHf alloys, no significant difference in corrosion resistance can be obtained with different Hf content. The analyses of surface morphologies of the Ti-30Nb-1Fe-xHf alloys after immersed in flouride solution suggest that the corrosion behavior is a selective type. On the other hand, a uniform corrosion mode is responsible for Ti-40-Nb-yHf alloys. The constituents on the surfaces of both types of alloy consist of hydroxide, TiO2 and Nb2O5, but not fluoride.
Subjects
Ti-30Nb-1Fe-xHf`
Ti-40Nb-yHf
Type
thesis
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