【摘要】 采用剥落腐蚀实验、电化学阻抗测试等方法,研究预轧变形对新型含钪Al-Cu-Li-Zr合金剥蚀性能的影响。研究结果表明:合金在EXCO溶液中剥落腐蚀敏感性由高到低依次表现为过时效→峰时效→欠时效;时效前,预轧变形不改变合金的腐蚀规律;T1相和无沉淀析出带(PFZ)是引起合金腐蚀的主要因素,预轧变形促进T1相的形核与长大;预轧变形后的合金,T1相粗化,PFZ变宽,剥落腐蚀程度更加严重。更多还原

【Abstract】 Exfoliation corrosion behavior of Al-3.5Cu-1.5Li-0.22(Sc+Zr) alloy under various treatment conditions was investigated by exfoliation corrosion tests and electrochemical impedance spectroscopy(EIS) tests.The results show that the exfoliation corrosion process is accelerated with the increase of aging time at 160 ℃,the exfoliation corrosion susceptibility of the alloy from high to low is as follows:over-aged alloy→peak-aged alloy→under-aged alloy.The introduction of pre-deformation has no influence on the sequence of EXCO process.As the main corrosion-caused factors of the alloy are T1 phase and PFZ,pre-deformation accelerates the nucleation and growth of T1,and PFZ also broadens.Compared with T6 alloy,T8 alloy suffers from faster exfoliation corrosion.更多还原