Journal
NPJ MATERIALS DEGRADATION
Volume 5, Issue 1, Pages -Publisher
SPRINGERNATURE
DOI: 10.1038/s41529-021-00158-5
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Funding
- Office of Naval Research [ONR: N00014-17-1-2807]
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A compositionally complex alloy composed of equiatomic concentrations of low-cost elements was designed and characterized using various analytical techniques. The corrosion behavior of the alloy was evaluated and found to exhibit a unique form of passivity, possibly due to the development of a silicon-rich surface film.
A compositionally complex alloy was designed, consisting of equiatomic concentrations of four low-cost commodity elements (Al, Fe, Mn, and Si). The alloy was characterized using scanning electron microscopy and energy-dispersive X-ray spectroscopy. The corrosion of the AlFeMnSi alloy, as evaluated using potentiodynamic polarization tests and electrochemical impedance spectroscopy in 0.6 M NaCl solution, was comparable with that of stainless steel (SS) 304L. Detailed X-ray photoelectron spectroscopy analysis was carried out, including the determination of high-resolution spectra and surface sputtering. In addition, scanning transmission electron microscopy was also used to study the surface film(s) developed after constant immersion. The AlFeMnSi alloy exhibited a unique form of 'passivity' that arises from the development of a silicon-rich surface film from dynamic incongruent dissolution.
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