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Corrosion behaviour of FeAl-type intermetallic compounds

AuthorsLópez, María Francisca ; Escudero Rincón, María Lorenza
KeywordsIron aluminides
Corrosion behaviour
Intermetallic alloys
Issue Date1998
CitationElectrochimica Acta 43(7): 671-678 (1998)
AbstractIn this study, the corrosion behaviour of two different iron aluminides based on FeAl, with two different microstructures, in a chloride-containing solution (pH = 7.4), has been investigated using electrochemical techniques. Both materials were studied in as-received condition and also after heat-treatment at 1100°C for two hours. This thermal process was performed to generate an alumina layer on the intermetallic surface with the purpose of improving its corrosion resistance. The polarization resistance method and the electrochemical impedance spectroscopy reveal similar corrosion resistance values for all samples although the corrosion attack produced is different. This result indicates that for these intermetallic alloys the alumina layer generated after two hours heat treatment is a low protecting layer due to the presence of additional oxides. Visual and optical microscopic observation of the sample surfaces reveal the formation of surface corrosion attack after the fourth day of immersion in the electrolyte for almost all samples. For samples without initial pits the anodic polarization curves showed a low pitting corrosion resistance. © 1997 Elsevier Science Ltd.
Publisher version (URL)http://doi.org/10.1016/S0013-4686(97)00208-9
Identifiersissn: 0013-4686
Appears in Collections:(CENIM) Artículos
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