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Corrosion Resistance of AlCoCrFeNiCuAg ( = 0.25, 0.5; = 0, 0.1) High-Entropy Alloys in 0.5M HSO Solution. | LitMetric
The electrochemical behavior of the as-cast AlCoCrFeNiCuAg ( = 0.25, 0.5; = 0, 0.1) high-entropy alloys (HEAs) in a 0.5M HSO solution was studied. Polarization measurements were carried out in a standard three-electrode electrochemical cell at room temperature using a platinum counter electrode and a saturated silver chloride reference electrode. For AlCoCrFeNiCu and AlCoCrFeNiCuAg, copper segregation along the grain boundaries was observed, which highly dissolved in the sulfuric acid solution and resulted in low corrosion resistance of the samples. Introducing Ag into AlCoCrFeNiCu HEA led to the precipitation of a copper-silver eutectic structure, in which the copper regions were selectively dissolved in the sulfuric acid solution. AlCoCrFeNiCu exhibited the best corrosion resistance with the corrosion current density of = 3.52 ± 0.02 μA/cm, significantly superior to that of the AlCoCrFeNi sample without copper and silver ( = 6.05 ± 0.05 μA/cm). Finally, the results indicated that suppressing elemental segregation by annealing or tailoring chemical composition is essential to improve the corrosion resistance of AlCoCrFeNiCuAg HEAs.
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