On the passivation characteristics of a β-FeAl intermetallic compound in sulphate solutions

S Frangini, N.De Cristofaro, J Lascovich, A Mignone

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Abstract

The corrosion and passivation behaviour of Fe-24 wt% Al intermetallic compound has been studied in sulphate solutions using cyclic voltammetry and potentiodynamic curves, combined with X-ray photoelectron spectroscopy (XPS). The voltammogramms performed in 0.5 M H2SO4show the peaks characteristic of the oxidation/reduction process of iron. The comparison of the anodic polarization curve of FeAl in acid solution with those of the pure elements shows the beneficial effect of Al when added to Fe in terms of both passive range and current density. At higher pH (6.0 and 13.6), the FeAl passivates spontaneously. Preliminary XPS studies of the passive films grown in air and anodically revealed coexistence of iron and aluminium oxides, thus explaining the superior corrosion resistance of iron aluminides compared to iron. © 1993.
Original languageEnglish
Pages (from-to)153 - 159
Number of pages7
JournalCorrosion Science
Volume35
Issue number1-4
DOIs
Publication statusPublished - 1993

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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