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Journal of Materials Science

, Volume 47, Issue 16, pp 6118–6124 | Cite as

Electrochemical characteristics of nano and microcrystalline Fe–Cr alloys

  • Rajeev K. Gupta
  • R. K. Singh Raman
  • C. C. Koch
Article

Abstract

The electrochemical behavior of nano and microcrystalline Fe–10Cr and Fe–20Cr alloys was determined using potentiodynamic polarization in 0.5 M H2SO4. Disks of the alloys were prepared by high-energy ball milling followed by compaction and sintering. In the current study, nanocrystalline Fe–Cr alloys reveal significantly different electrochemical characteristics, typified by lower anodic current densities and more negative passivation potentials, compared with their microcrystalline counterparts. In addition to the differences in grain boundary density, compositional characterization of corrosion films carried out by X-ray photoelectron spectroscopy indicates a higher Cr content in the film developed upon nanocrystalline Fe–Cr alloys. Mechanisms for observed enhancement in the corrosion performance of the nanocrystalline Fe–Cr alloys are discussed.

Keywords

Passive Film Passive Current Density Surface Mechanical Attrition Treatment Potentiodynamic Polarization Test Corrosion Film 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

The authors acknowledge the support of the Australian Research Council (ARC) Discovery grant scheme (DP0665112) for funding this study.

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Rajeev K. Gupta
    • 1
    • 2
  • R. K. Singh Raman
    • 2
    • 3
  • C. C. Koch
    • 4
  1. 1.Department of Materials EngineeringMonash UniversityMelbourneAustralia
  2. 2.Department of Mechanical and Aerospace EngineeringMonash UniversityMelbourneAustralia
  3. 3.Department of Chemical EngineeringMonash UniversityMelbourneAustralia
  4. 4.Department of Materials Science and EngineeringNorth Carolina State UniversityRaleighUSA

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