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.

设计了一种成分复杂的合金，该合金由等原子浓度的四种低成本商品元素（Al，Fe，Mn和Si）组成。使用扫描电子显微镜和能量色散X射线光谱对合金进行表征。使用电位极化测试和电化学阻抗谱在0.6 M NaCl溶液中评估的AlFeMnSi合金的腐蚀与不锈钢（SS）304L相当。进行了详细的X射线光电子能谱分析，包括高分辨率光谱的测定和表面溅射。另外，扫描透射电子显微镜还用于研究恒定浸没后形成的表面膜。