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

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 H 2SO 4 show the peaks characteristic...

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Bibliographic Details
Published in:Corrosion science 1993, Vol.35 (1), p.153-159
Main Authors: Frangini, S., Cristofaro, N.De, Lascovich, J., Mignone, A.
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion mechanisms
Exact sciences and technology
Metals. Metallurgy
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Summary: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 H 2SO 4 show 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.
ISSN:0010-938X
1879-0496
DOI:10.1016/0010-938X(93)90145-7