通过显微硬度测试、晶间腐蚀(IGC)、交流阻抗实验和透射电镜(TEM)观察,研究了2022和2139合金在T6( 175℃)时效过程中的时效硬化特征、晶间腐蚀行为和微观组织演化.结果表明:2022和2139合金在175℃达到峰值时效的时间分别为20 h和15h.两种合金在峰时效状态下其晶间腐蚀最为敏感;过时效状态下都产生大面积腐蚀坑而未观察到明显的晶间腐蚀.然而欠时效状态下2022合金的抗腐蚀能力优于2139合金的;峰时效状态下2022合金的抗腐蚀能力明显低于2139合金的,这与两种合金在小同的时效状态下析出相的种类、分布和形貌有关.
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