Electrochemical Corrosion Behavior of Iron Aluminides in Sulfuric Acid

In the present work, samples of a binary intermetallic alloy (Fe3Al) with 26at.%Al were submitted to electrochemical corrosion evaluation in a 0.5M H2SO4 solution containing naturally dissolved oxygen. The corrosion resistance was evaluated by applying linear polarization, electrochemical impedance...

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Bibliographic Details
Published inMaterials science forum Vol. 1012; pp. 395 - 400
Main Authors de Andrade Oliveira, Gabriela, de Carvalho Filho, Carlos Trivellato, Brito, Pedro Paiva
Format Journal Article
LanguageEnglish
Published Trans Tech Publications Ltd 27.10.2020
Subjects
Electrochemical Impedance Spectroscopy
Corrosion
Potentiodynamic Polarization
Iron Aluminide
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Summary:In the present work, samples of a binary intermetallic alloy (Fe3Al) with 26at.%Al were submitted to electrochemical corrosion evaluation in a 0.5M H2SO4 solution containing naturally dissolved oxygen. The corrosion resistance was evaluated by applying linear polarization, electrochemical impedance spectroscopy and potentiodynamic polarization at 22 and 35°C. The results obtained revealed that in both conditions the material exhibits active-passive behavior. Heating to 35°C did not alter the passivity characteristics of the alloy (passivation range and passive current density), but elevated the corrosion current density and the critical current density. The polarization resistance of the samples was also decreased with temperature, following the trend observed for the corrosion current density.
Bibliography:Selected, peer-reviewed papers from the 23rd Brazilian Conference on Materials Science and Engineering (23rd CBECIMAT), November 4-8, 2018, Foz do Iguaçu, Brazil
ISSN:0255-5476
1662-9752
1662-9752
DOI:10.4028/www.scientific.net/MSF.1012.395