Hot Corrosion Behavior of FeAl Intermetallic Compound Modified with Silver in Molten Salt Mixture

The hot corrosion behavior of Fe40Al intermetallic alloyed with 2.5 at. % Ag in KCl-ZnCl2 (1:1M) at 450 °C has been studied and assessed by means of electrochemical techniques. Techniques included potentiodynamic polarization curves, linear polarization resistance (LPR) and electrochemical impedance...

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Bibliographic Details
Published inInternational journal of electrochemical science Vol. 8; no. 10; pp. 11877 - 11895
Main Authors Rodríguez-Diaz, R.A., Uruchurtu-chavarín, J., Molina-Ocampo, A., Porcayo-Calderon, J., Mendoza, M.E., Valdez, S., Juárez-Islas, J.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.10.2013
Subjects
electrochemical technique
FeAl aluminide
hot corrosion
intermetallic compound
FeAl aluminide
electrochemical technique
intermetallic compound
hot corrosion
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Summary:The hot corrosion behavior of Fe40Al intermetallic alloyed with 2.5 at. % Ag in KCl-ZnCl2 (1:1M) at 450 °C has been studied and assessed by means of electrochemical techniques. Techniques included potentiodynamic polarization curves, linear polarization resistance (LPR) and electrochemical impedance spectroscopy (EIS) measurements. Furthermore thermodynamic stability phase diagrams were calculated and elaborated in order to improve the understanding of the corrosion mechanism. Results have shown that addition of Ag increase the corrosion rate. Besides, corrosion potential of Fe-Al-Ag alloy resulted nobler. Ternary Fe-Al-Ag alloy exhibited a more noble corrosion potential but a bigger corrosion rate than the 304 SS specimen corroded under the same experimental conditions. Corrosion behavior is explained in terms of the stability of the corrosion products formed film.
ISSN:1452-3981
1452-3981
DOI:10.1016/S1452-3981(23)13229-9