Abstract
Corrosion behavior of FeAl-based alloys containing carbon produced through arc melting in argon atmosphere has been studied at 500 °C to 700 °C. The samples were tested in the aggressive environment of molten salts (80%V2O5/20%Na2SO4). The corrosion behavior was observed by weight change method and the layer products formed were examined by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). The different phase components were observed in the surface layer after the test in Fe-22Al alloy. A protective Al2O3 layer was confirmed for Fe-22Al alloy containing carbon only. However, an additional TiO layer was also observed in Fe-22Al alloy containing carbon with Ti addition. The microstructural and XRD examinations revealed that this additional TiO layer protects better against penetration of corrosive media. The corrosion resistance behavior of FeAl-based alloys were addressed on the basis of microstructural evidence.
Highlights
Many industrial components of various engineering systems such as fuel sources used at high temperature, power generation devices, aircraft gas turbines, fuel cells, etc. fail at high temperatures
Iron aluminides containing carbon with and without Ti addition alloys were prepared by arc melting under argon using pure iron (99.0%), pure aluminum (99.99%) and pure titanium (99.9%) powders
Addition of Ti to iron aluminide containing carbon leads to formation of carbides namely TiC and Fe3 AlC0.5
Summary
Many industrial components of various engineering systems such as fuel sources (oil and coal) used at high temperature, power generation devices, aircraft gas turbines, fuel cells, etc. fail at high temperatures. The degradation of components occurred by accelerated attack due to condensation of films composed of molten salts. Transition metal aluminides such as Fe, Ti, Ni, etc. Are potentially more suitable alternatives to superalloys at high temperatures with applications in aggressive environmental conditions [1,2,3]. These materials show excellent resistance to corrosion, oxidation, sulfidation, and carburizing atmospheres, even at high temperatures, due to the formation of stable alumina layer [2,4]. Iron aluminides have been poorly studied in the environment composed of (Na2 SO4 -V2 O5 ) molten salt
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