2197铝锂合金在不同热处理状态下的晶间腐蚀及剥蚀行为  

Intergranular Corrosion and Exfoliation Corrosion Behaviors of 2197 Al-Li Alloy with Different Aging Treatments

作　　者：陈圆圆[1] 郑子樵[1] 魏修宇[1] 潘峥嵘[1] 李世晨[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《腐蚀与防护》2010年第1期29-33,共5页Corrosion & Protection

基　　金：民口配套项目:(MKPT-2004-19ZD)

摘　　要：研究了T6和T8态两种时效状态下的2197铝锂合金的晶间腐蚀和剥蚀行为。结果表明,随时效时间延长,晶界T1相数量及晶界无沉淀带宽度增加,合金晶间腐蚀和剥蚀敏感性增加;更低的时效温度和时效前的预变形,促进T1相析出,并使无沉淀析出带宽度减小,因此T8态的耐蚀性优于T6态。通过电化学阻抗谱可准确地判断合金的剥蚀敏感性,由此判断出的剥蚀发生时间和剥蚀敏感性与通过剥蚀照片观察的结果一致。The intergranular corrosion and exfoliation corrosion behaviors of 2197 Al-Li alloy with T6 temper and T8 temper were investigated. The results show that with the increase of aging time, the number of T1 phase and precipitate-free zone （PFZ） at grain boundaries increased, and the susceptibility to intergranular corrosion and exfoliation corrosion was enhanced. The corrosion resistence of the alloy under T8 condition was better than that under T6 condilion, because lower aging temperatured and pre^deformation prior to aging promoted T1 phase precipitation and minimize PFZ at grain boundaries. The susceptibility to exfoliation corrosion estimated by the electrochemical impedance speetruscopy （EIS） was the same as the one estimated by exfoliation photograph observesion.

关 键 词：2197铝锂合金 晶间腐蚀 剥蚀 电化学阻抗谱 

分 类 号：TG172[金属学及工艺—金属表面处理] TG146.2[金属学及工艺—金属学]