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Abstract
<title>Abstract</title> <p> The cyclic corrosion tests of Al <sub>x</sub> Co <sub>20</sub> Cr <sub>20</sub> Fe <sub>(40−x)</sub> Ni <sub>20</sub> (x = 4, 9, 12, 14 at. %) high-entropy alloys were performed at 700 <sup>o</sup> C for 80 h in a N <sub>2</sub> –9%CO <sub>2</sub> –7%O <sub>2</sub> –0.1% HCl (mol/mol) atmosphere. Thermodynamic equilibrium calculations were consistent with the XRD phase analysis results of the alloys, validating the reliability of the computational approach. With the exception of Al4 (Al <sub>4</sub> Co <sub>20</sub> Cr <sub>20</sub> Fe <sub>36</sub> Ni <sub>20</sub> ) alloy, all other high-entropy alloys exhibited superior corrosion resistance to Inconel 625. Al9 alloy developed the most continuous and dense corrosion products, achieving a weight gain of merely 5.15% relative to that of Inconel 625. XPS revealed Co/Cr surface reconstruction on Al4 alloy and ultrathin Al <sub>2</sub> O <sub>3</sub> layers on Al9 and Al14 alloys. The exceptional corrosion resistance of Al9 alloy is attributed to the synergistic effect of a moderate grain boundary area, an appropriate second-phase content, rapid formation of a dense outer Al <sub>2</sub> O <sub>3</sub> layer, and slow growth of an inner Al <sub>2</sub> O <sub>3</sub> layer. </p>