Electrochemical studies on high-temperature corrosion of silicon-iron coatings and iron aluminide intermetallic alloys by molten salts

M. Amaya*, J. Porcayo-Calderon, L. Martinez

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The performance of Fe-Si coatings and an iron aluminide (FeA1) intermetallic alloy (FeA140at%+0.1 at%B+1Ovol%At2O3) in molten salts containing vanadium pentoxide (V2O5) and sodium sulfate (Na2SO4) is reported. Corrosion and fouling by ash deposits containing V2O5 and Na2SO4 are typical corrosion problems in fuel oil-fired electric power units. High-temperature corrosion tests were performed using both electrochemical polarization and immersion techniques. The temperature interval of this study was 600°C to 900°C, and the molten salts were 80wt%V2O5-20wt%Na2SO4. Curves of corrosion current density vs temperature obtained by the potentiodynamic studies are reported, as well as the weight loss vs temperature curves from molten salt immersion tests. Both Fe-Si coatings and FeA14Oat%+O.1at%B+10vol%A12O3 showed good behavior against molten salt corrosion. The final results show the potential of these coatings and alloys to solve the high-temperature corrosion in fuel oil-fired electric power units.

Original languageEnglish
Pages (from-to)489-496
Number of pages8
JournalCorrosion
Volume57
Issue number6
DOIs
StatePublished - Jun 2001
Externally publishedYes

Keywords

  • High-temperature corrosion
  • Iron aluminide
  • Molten salts
  • Silicon-iron coatings
  • Vanadates

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