Changes in the resistance to corrosion of thermally passivated titanium aluminide during exposure to sodium chloride solution
Author
Saebnoori, E.
Shahrabi, T.
Jafarian H.
Ghaffari, M.
Date
2015Source Title
Research on Chemical Intermediates
Print ISSN
0922-6168
Publisher
Kluwer Academic Publishers
Volume
41
Issue
2
Pages
1079 - 1095
Language
English
Type
ArticleItem Usage Stats
108
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Abstract
In this study the surface of Ti-47Al-2Cr (at. %) was modified by heating and exposure to nitrogen gas flow to form a predominantly oxide layer on the surface. Samples were then immersed in Ringer's solution and 3.5 wt. % sodium chloride solution and electrochemical impedance spectroscopy tests were performed at regular intervals. The results showed that the layer is highly resistant to corrosion. The equivalent circuit proposed for the impedance curves includes a Warburg element, because diffusion is controlling charge transfer through the passive surface layer. The resistance of the layer was not significantly reduced even after 300 h exposure to solutions and scanning electron micrographs showed the surface was not damaged. © 2013 Springer Science+Business Media Dordrecht.
Keywords
CorrosionEIS
Electrochemical stability
Gamma titanium aluminide (γ-TiAl)
Passivation
Sodium chloride
Charge transfer
Corrosion
Electrochemical corrosion
Electrochemical impedance spectroscopy
Flow of gases
Nitrogen
Passivation
Scanning electron microscopy
Sodium
Sodium chloride
Titanium
EIS
Electrochemical stabilities
Gamma-titanium aluminide
Nitrogen gas flow
Ringer's solution
Scanning electron micrographs
Sodium chloride solution
Titanium aluminides
Surface resistance
Permalink
http://hdl.handle.net/11693/22769Published Version (Please cite this version)
http://dx.doi.org/10.1007/s11164-013-1255-4Collections
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