Processing and electrochemical corrosion resistance of a nanocrystalline Fe-20Cr alloy

Rajeev K. Gupta, R. K.Singh Raman, Carl Koch

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

1 Citation (Scopus)

Abstract

Discs of nanocrystalline (nc) and microcrystalline (mc) Fe-20Cr alloys were prepared by high energy ball milling followed by pre-annealing, compaction and sintering. Electrochemical corrosion of discs of nc and mc Fe-20Cr alloys thus produced was investigated at room temperature in 0.5M H2SO 4 solution using potentiodynamic polarization tests. Nanocrystalline Fe-20Cr alloy has shown improved electrochemical corrosion resistance over its microcrystalline counterpart as characterized by passivation potential, critical current density and passive current density. Passivation is achieved at relatively lower potential in nanocrystalline form of alloy. Compositional characterization of passive films carried out by X-ray photoelectron spectroscopy (XPS) suggests higher Cr content in the passive film of nanocrystalline form of the alloy than that of their microcrystalline counterpart. Based on the XPS and polarization results, mechanistic understanding of the observed enhancement in the corrosion resistance of the nanocrystalline Fe-Cr alloys is discussed.

Original languageEnglish
Title of host publicationTMS 2010 - 139th Annual Meeting and Exhibition - Supplemental Proceedings
Pages703-710
Number of pages8
Volume1
Publication statusPublished - 2010
EventTMS Annual Meeting and Exhibition 2010 - Seattle, WA, United States of America
Duration: 14 Feb 201018 Feb 2010
Conference number: 139th

Conference

ConferenceTMS Annual Meeting and Exhibition 2010
CountryUnited States of America
CitySeattle, WA
Period14/02/1018/02/10

Keywords

  • Ball milling
  • Corrosion
  • Fe-Cr alloys
  • Ferritic stainless steel
  • Nanocrystalline

Cite this

Gupta, R. K., Raman, R. K. S., & Koch, C. (2010). Processing and electrochemical corrosion resistance of a nanocrystalline Fe-20Cr alloy. In TMS 2010 - 139th Annual Meeting and Exhibition - Supplemental Proceedings (Vol. 1, pp. 703-710)