The 2XXX Al alloys are characterized by their superior mechanical properties resulting from alloying elements and precipitation hardening treatments. The AA2524-T3 alloy was developed to replace the AA2024-T3 alloy in the aerospace industry. However, both alloys present many intermetallic particles (IMCs) in their microstructure, and this is the main reason for their high susceptibility to localized corrosion (such as pitting and stress corrosion cracking). Despite the similarities between these alloys (e.g., chemical composition and type of intermetallics) the literature comparing their properties is scarce and focuses mainly on their mechanical properties, not their corrosion resistances. In this investigation, the corrosion resistance of the AA2524-T3 alloy was compared to the AA2024-T3 alloy. The microstructure of both alloys was analyzed by Scanning Electron Microscopy before and after immersion in the test electrolyte, and the number and area fraction of intermetallics of each alloy was determined. The corrosion resistance of both alloys was monitored as a function of exposure time by electrochemical impedance spectroscopy and the results were fitted using electrical equivalent circuits. The AA2524-T3 alloy presented not only higher impedance values but also less corroded areas than the AA2024-T3 alloy.

中文翻译：

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AA2524-T3和AA2024-T3的耐腐蚀性比较

2XXX 铝合金的特点是由于合金元素和沉淀硬化处理而具有优异的机械性能。AA2524-T3合金是为了在航空航天工业中替代AA2024-T3合金而开发的。然而，这两种合金在其微观结构中都存在许多金属间化合物颗粒 (IMC)，这是它们对局部腐蚀（如点蚀和应力腐蚀开裂）高度敏感的主要原因。尽管这些合金之间有相似之处（例如，化学成分和金属间化合物的类型），但比较它们性能的文献很少，并且主要关注它们的机械性能，而不是它们的耐腐蚀性。在这项研究中，AA2524-T3 合金的耐腐蚀性能与 AA2024-T3 合金进行了比较。在浸入测试电解液之前和之后，通过扫描电子显微镜分析两种合金的微观结构，并确定每种合金的金属间化合物的数量和面积分数。通过电化学阻抗谱监测两种合金的耐腐蚀性作为暴露时间的函数，并使用等效电路拟合结果。与 AA2024-T3 合金相比，AA2524-T3 合金不仅具有更高的阻抗值，而且腐蚀区域也更少。通过电化学阻抗谱监测两种合金的耐腐蚀性作为暴露时间的函数，并使用等效电路拟合结果。与 AA2024-T3 合金相比，AA2524-T3 合金不仅具有更高的阻抗值，而且腐蚀区域也更少。通过电化学阻抗谱监测两种合金的耐腐蚀性作为暴露时间的函数，并使用等效电路拟合结果。与 AA2024-T3 合金相比，AA2524-T3 合金不仅具有更高的阻抗值，而且腐蚀区域也更少。