几种时效制度铝锂合金在Cl-环境下的腐蚀行为  

Research of Corrosion Behavior for Al-Li Alloy at Different Aged States in Cl-Solution

作　　者：张蕾[1] 陈群志[1] 王逾涯[1] 严卫东[1] 

机构地区：[1]北京航空工程技术研究中心,北京100076

出　　处：《航空材料学报》2007年第4期31-35,共5页Journal of Aeronautical Materials

基　　金：国家自然科学基金重点项目资助(50435020)

摘　　要：以盐雾硫化腐蚀试验作为加速腐蚀试验,对不同时效制度下1420合金的表面腐蚀形貌进行观察。以最大腐蚀深度为腐蚀损伤衡量指标,研究双级时效合金模锻件腐蚀的统计规律。结果发现,盐雾硫化腐蚀试验7天的1420双级时效合金的最大腐蚀深度符合Gumbel统计规律。显微组织观察表明,双级时效不仅能有效控制沉淀相(δ′相)和平衡相(S相)的长大速率,同时也使析出相均匀分布。合金中均匀分布的S相降低阳极相与基体间的电位差,减弱阳极溶解的驱动力,有效改善合金的腐蚀抗力。Salt spray sulfuration corrosion tests were applied to 1420 Al-Li alloy. Maximum corrosion depth was measured to evaluate the severity of corrosion. Since localized corrosion was a stochastic phenomenon, a statistic analysis method was used to deal with the data. The results showed that, for 1420 alloy at double-ageing state, the maximum corrosion depth was consistent with the Gumbel distribution law. TEM micrographs revealed that δ＇ phase and S phase were uniform in the double-ageing state alloy. Thus enhanced the corrosion performance of 1420 alloy.

关 键 词：铝锂合金 双级时效 统计分析 最大腐蚀深度 

分 类 号：TG174.3[金属学及工艺—金属表面处理] V416.5[金属学及工艺—金属学]