腐蚀环境对 LC4CS 铝合金疲劳裂纹闭合的影响  

Influence of Corrosion Environment on Fatigue Crack Closure of LC4CS Aluminum Alloy

作　　者：贺斌[1] 何建平[1] 樊蔚勋[1] 

机构地区：[1]南京航空航天大学飞行器系

出　　处：《南京航空航天大学学报》1997年第5期560-563,共4页Journal of Nanjing University of Aeronautics & Astronautics

摘　　要：采用透射电子显微镜观察了３．５％ＮａＣｌ溶液中的ＬＣ４ＣＳ薄膜试样裂纹扩展，并用俄歇能谱仪对ＬＣ４ＣＳ铝合金边缺口试件在３．５％ＮａＣｌ溶液中腐蚀疲劳裂纹面进行了测试。结果表明，腐蚀介质使薄膜试样裂纹扩展，裂纹面有腐蚀产物生成；腐蚀疲劳裂纹面生成的致密的钝化膜抑制了腐蚀产物的进一步发展，分析认为，３．５％ＮａＣｌ溶液中ＬＣ４ＣＳ铝合金裂纹闭合与干燥空气中相同。The influence of 3.5%NaCl solution on the crack of the thin foil LC4CS aluminum alloy specimen has been observed from TEM, and the corrosion fatigue crack for LC4CS aluminum alloy notched specimen in 3.5%NaCl solution is measured by use of Augur Electron Spectrum Scope. The observed results show that the crack of the thin foil LC4CS aluminum alloy specimen can propagate in 3.5%NaCl solution and the corrosion products are formed on the crack surface. The compact passive film on corrosion fatigue crack limits the further deve lopment of corrosion products. The analysis leads to the fact that the crack closure in 3.5% NaCl solution of LC4CS aluminum alloy remains the same as that in dry air.

关 键 词：腐蚀疲劳 铝合金 钝化 裂纹闭合 裂纹扩张 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG113.225[金属学及工艺—金属材料]