The influence of H₂SO₄ solution concentration on the corrosion behavior of as-cast Al_0.1CoCrFeNi high-entropy alloys (HEAs) is investigated. The potentiodynamic polarization curves of the Al_0.1CoCrFeNi HEA exhibit excellent corrosion resistance and a wide passive region (ΔE > 1150 mV) in acid solutions. The samples show a spontaneous passivation behavior in low-concentration (0.1, 0.2 and 0.3 M) and two anodic active–passive peaks in high-concentration (0.5 and 1.0 M) H₂SO₄ solutions. The morphology investigation by scanning electron microscopy suggests that selective corrosion is initiated from the inter-dendrite regions. The X-ray photoelectron spectroscopy results demonstrate that the observed passive behavior variation is associated with chemical composition change of the passive films.

研究了 H ₂ SO ₄溶液浓度对铸态 Al _0.1 CoCrFeNi 高熵合金 (HEAs)腐蚀行为的影响。Al _0.1 CoCrFeNi HEA的动电位极化曲线在酸性溶液中表现出优异的耐腐蚀性和宽的钝化区（ΔE > 1150 mV）。样品在低浓度（0.1、0.2 和 0.3 M）中显示自发钝化行为，在高浓度（0.5 和 1.0 M）H ₂ SO _{4 中显示}两个阳极主动-被动峰解决方案。扫描电子显微镜的形态研究表明，选择性腐蚀是从枝晶间区域开始的。X 射线光电子能谱结果表明，观察到的钝化行为变化与钝化膜的化学成分变化有关。