NaCl电解液薄层下LC4CS铝合金腐蚀疲劳性能  

Corrosion Fatigue Properties of LC4CS Aluminum Alloy Covered with NaCl Thin Electrolyte Layer

作　　者：何建平[1] 陈素晶[1] 袁庆铭[2] 樊蔚勋[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016 [2]厦门航空有限公司,厦门361009

出　　处：《南京航空航天大学学报》2004年第4期412-416,共5页Journal of Nanjing University of Aeronautics & Astronautics

基　　金：民航总局 2 0 0 0科研基金资助项目

摘　　要：以 Na Cl薄液层模拟 LC4CS铝合金的大气腐蚀环境 ,并在实验室空气中、3 .5 % Na Cl溶液中和 Na Cl薄液层作用下研究 LC4CS铝合金的疲劳性能。结果显示 ,在 ΔK小于 40 0 N/mm3/2时 ,薄液层下铝合金的腐蚀疲劳裂纹扩展速率大于 Na Cl溶液中的数值 ,也大于实验室空气中的数值。在ΔK较小时 ,薄液层下腐蚀疲劳裂纹断口的特征与 Na Cl溶液中的较为接近 。Atmospheric corrosion environment was simulated by generating 3.5% NaCl electrolyte thin layer on the surface of LC4CS aluminum alloy. The fatigue behavior of the alloy is studied while the alloy is in lab air, in 3.5% NaCl solution and covered with the electrolyte thin layer. Results obtained from these experiments show that the rate of the corrosion fatigue crack growth (CFCG) of the alloy covered with electrolyte thin layer is higher than the rate of CFCG in 3.5% NaCl solution and greater than the rate of CFCG in lab air, while ΔK is lower than 400 N/mm^(3/2). The microstructure of the fatigue fracture surface covered with the electrolyte thin layer is analogous to that in the NaCl solution and is characteristic of the typical river pattern structure.

关 键 词：NACL 电解液 LC4CS铝合金 腐蚀疲劳性能 大气腐蚀环境 飞机材料 

分 类 号：V252[一般工业技术—材料科学与工程]