The influence of various major and minor alloying elements on the corrosion of an Fe-40%Cr superferritic stainless steel in sulphuric acid

J. H. Potgieter, K. Varga

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6 Citations (Scopus)

Abstract

The corrosion resistance of an Fe-40%Cr superferritic alloy containing various major and minor alloying additions, e.g. nickel, molybdenum, aluminium, zirconium, nitrogen, niobium, titanium and ruthenium, as well as various combinations of them, was investigated in dilute sulphuric acid. Although small nickel and molybdenum additions alone cannot cause spontaneous passivation of the Fe-40% Cr alloy to which they are added, a combination of these two alloying elements result in an Fe-40%-Cr superferritic stainless steel which can passivated spontaneously in dilute sulphuric acid. Further additions of minor alloying elements like Ti, Nb, Ru and N have an influence on the time required to achieve spontaneous passivation and the final open-circuit potential eventually reached. Further additions of Al and Zr to the Fe-40%Cr-2%Ni-2%Mo alloy did not have much of an effect on the final open-circuit potential reached, and only affected the time required before this potential was reached in each case.

Original languageEnglish
Pages (from-to)221-227
Number of pages7
JournalMaterials and Corrosion - Werkstoffe und Korrosion
Volume48
Issue number4
DOIs
Publication statusPublished - Apr 1997

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ASJC Scopus subject areas

  • Environmental Chemistry
  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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