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      Changes in the resistance to corrosion of thermally passivated titanium aluminide during exposure to sodium chloride solution

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      Author
      Saebnoori, E.
      Shahrabi, T.
      Jafarian H.
      Ghaffari, M.
      Date
      2015
      Source Title
      Research on Chemical Intermediates
      Print ISSN
      0922-6168
      Publisher
      Kluwer Academic Publishers
      Volume
      41
      Issue
      2
      Pages
      1079 - 1095
      Language
      English
      Type
      Article
      Item Usage Stats
      108
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      106
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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
      Corrosion
      EIS
      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/11693/22769
      Published Version (Please cite this version)
      http://dx.doi.org/10.1007/s11164-013-1255-4
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      • Department of Electrical and Electronics Engineering 3524
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