• Deciphering the potentiodynamic polarization curves of iron aluminides Fe3Al and Fe3Al + Cr

    • Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/019/05/0831-0835

    • Keywords

       

      Iron aluminide; hydrogen embrittlement; potentiodynamic polarization; mixed potential theory

    • Abstract

       

      The potentiodynamic polarization curves of Fe3Al and Fe3Al + Cr intermetallics obtained in aerated pH 4 H2SO4 acidic solution have been theoretically analyzed. The role of chromium in minimizing the hydrogen embrittlement (HE) of the intermetallic Fe3Al (resulting in its poor ductility) has been addressed based on the analysis. In the case of the chromium-alloyed iron aluminide, calculations indicate that hydrogen liberation does not occur on the surface due to the shift of the corrosion mixed potential to a value nobler than the electrode potential for the hydrogen evolution reaction. This shift occurs due to the induction of passivity on alloying with Cr resulting in the formation of a passive film. The minimization of HE of iron aluminides on alloying with Cr can thus be understood.

    • Author Affiliations

       

      Sagato Mukherjee1 R Balasubramaniam1

      1. Department of Materials and Metallurigical Engineering, Indian Institute of Technology, Kanpur - 208 016, India
    • Dates

       
  • Bulletin of Materials Science | News

    • Dr Shanti Swarup Bhatnagar for Science and Technology

      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2021-2022 Indian Academy of Sciences, Bengaluru.