A study on the effect of Co, Cr and Ti on the corrosion of FE40AL intermetallic in molten NaCl-KCl mixture

L. Romo, J. G. Gonzalez-Rodriguez*, J. Porcayo-Calderon, R. Guardian, V. M. Salinas-Bravo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The effect of the addition of 3 at% Cr, Co or Ti on the corrosion behavior of Fe40Al intermetallic alloy in 1 M NaCl:1 M KCl mixture at 750 °C has been carried out by using electrochemical techniques. Techniques included potentiodynamic polarization curves, linear polarization resistance and electrochemical impedance spectroscopy measurements. It has been found that the addition of either Cr, Co or Ti decreased the corrosion rate of Fe40Al intermetallic by almost five times due to the formation of a passive layer, absent in the base alloy. This was because the diffusion of Al towards the top of the alloy for the establishment of a protective Al2O3 layer was enhanced by the presence of these alloying elements. The corrosion rate for the base alloy was under diffusion control of the reactants, whereas that for alloyed intermetallic was under charge transfer control.

Original languageEnglish
Pages (from-to)156-165
Number of pages10
JournalIntermetallics
Volume67
DOIs
StatePublished - 5 Dec 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.

Keywords

  • Electrochemical impedance
  • Fe40 Al
  • Molten salt corrosion

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