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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/023/05/0399-0403

    • Keywords

       

      Corrosion; iron aluminides; FeAl; potentiodynamic polarization

    • Abstract

       

      The corrosion behaviour of two carbon-alloyed intermetallics of composition Fe-28.1Al-2.1C and Fe-27.5Al-3.7C has been studied and compared with that of binary intermetallics. Potentiodynamic polarization studies indicated that the intermetallics exhibited active-passive behaviour in an acidic solution of pH = 1, whereas they exhibited stable passivity in a buffer solution of pH 8.4. Corrosion rates were also obtained by immersion testing. The variation of corrosion rate as a function of time was similar for both the intermetallics. The variation in corrosion rate as a function of time has been explained based on the observed potentiodynamic polarization behaviour. Scanning electron microscopy of corroded surfaces indicated that the carbon-alloyed intermetallics were susceptible to galvanic corrosion, due to the presence of carbides.

    • Author Affiliations

       

      M Sen1 R Balasubramaniam1 A V Ramesh Kumar1 2

      1. Department of Materials and Metallurgical Engineering, Indian Institute of Technology, Kanpur - 208 016, India
      2. Defence Materials Stores and Research Development Establishment, Kanpur - 208 013, India
    • Dates

       

© 2017 Indian Academy of Sciences, Bengaluru.