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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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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.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Tarbiat Modares University, P.O. Box: 14115-143, Tehran, Iran

    Ehsan Saebnoori & Taghi Shahrabi

  2. School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Tehran, Iran

    Hamidreza Jafarian

  3. Department of Electrical and Electronics Engineering, UNAM-Institute of Materials Science and Nanotechnology, Bilkent University, 06800, Ankara, Turkey

    Mohammad Ghaffari

Authors
  1. Ehsan Saebnoori
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  2. Taghi Shahrabi
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  3. Hamidreza Jafarian
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  4. Mohammad Ghaffari
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Correspondence to Taghi Shahrabi.

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Saebnoori, E., Shahrabi, T., Jafarian, H. et al. Changes in the resistance to corrosion of thermally passivated titanium aluminide during exposure to sodium chloride solution. Res Chem Intermed 41, 1079–1095 (2015). https://doi.org/10.1007/s11164-013-1255-4

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  • DOI: https://doi.org/10.1007/s11164-013-1255-4

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