ABSTRACT The evolution of strength and corrosion behaviour induced by ageing treatment in Al-Cu-Mg alloy is poorly understood. In this work, correlations among strength, intergranular corrosion and pitting corrosion induced by precipitates were studied by various corrosion performance tests and hardness tests. The susceptibility of intergranular corrosion is decreased and pitting corrosion sensitivity is increased as the ageing temperature and time are increased. Retrogression and re-ageing treatments not only transform the size of the intragranular precipitates from greater than 500 nm to be less than 10 nm but also lead to the discontinuous distribution of grain boundary precipitates. The microstructural changes in the grain interior and grain boundary together promote the Al-Cu-Mg alloys to have high-strength and excellent resistance to intergranular corrosion and pitting corrosion.

中文翻译：

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控制时效工艺对Al-Cu-Mg合金的高强抗腐蚀

摘要对 Al-Cu-Mg 合金中时效处理引起的强度和腐蚀行为的演变知之甚少。在这项工作中，通过各种腐蚀性能测试和硬度测试，研究了强度、晶间腐蚀和析出物引起的点蚀之间的相关性。随着时效温度和时间的增加，晶间腐蚀的敏感性降低，点蚀敏感性增加。退化和再时效处理不仅使晶内析出物的尺寸从大于 500 nm 转变为小于 10 nm，而且导致晶界析出物的不连续分布。