两种典型大气环境下7A85铝合金的腐蚀行为研究  

Corrosion Behavior of 7A85 Aluminum Alloy in Two Typical Atmospheric Environments

作　　者：赵全成 罗来正[1] 黎小锋[3] 苏艳[1] ZHAO Quan-cheng;LUO Lai-zheng;LI Xiao-feng;SU Yan(Southwest Technology and Engineering Research Institute,Chongqing 400039,China;Dunhuang Gansu Materials Corrosion in Atmospheric Environment,National Observation&Research Station,Dunhuang 736200,China;Chongqing College of Electronic Engineering,Chongqing 401331,China)

机构地区：[1]中国兵器工业第五九研究所,重庆400039 [2]甘肃敦煌大气环境材料腐蚀国家野外科学观测研究站,736200 [3]重庆电子工程职业学院,重庆401331

出　　处：《装备环境工程》2020年第7期70-75,共6页Equipment Environmental Engineering

摘　　要：目的研究湿热海洋、干热沙漠两种典型大气环境对7A85铝合金腐蚀行为的影响。方法在万宁、敦煌两种典型环境中开展7A85铝合金大气暴露试验,利用金相显微镜分析7A85铝合金在我国两种典型大气环境中的腐蚀特征,定期测试该材料的拉伸强度和腐蚀深度。结果暴露3 a,7A85铝合金湿热海洋、干热沙漠两种典型大气环境中的最大腐蚀深度分别为254、90μm,抗拉强度分别下降了18%和5%,断后伸长率分别下降了72%和22%。结论 7A85铝合金暴露于相对湿度较低的干热沙漠环境,表面形成的腐蚀产物膜会阻止腐蚀的进一步发生;暴露于湿热海洋大气环境,随暴露时间的延长,7A85铝合金腐蚀逐渐加深。The paper aims to research influences of two typical atmospheric environments of damp hot ocean and dry-heat desert on corrosion behavior of 7 A85 aluminum alloy. Atmospheric exposure tests of 7 A85 aluminum alloy were carried out in Wanning and Dunhuang. The corrosion characteristics of 7 A85 aluminum alloy in two typical atmospheric environments were investigated by metallographic microscope. The tensile strength and corrosion depth of the material were tested regularly. After 7 A85 aluminum alloy was exposed for 3 years in damp hot ocean atmospheric environment and dry heat desert atmospheric environment, the maximum corrosion depth was 254 μm and 90 μm respectively;the tensile strength was reduced by 18% and 5% respectively;and the elongation after fracture was reduced by 72% and 22% respectively. If 7 A85 aluminum alloy is exposed in dry-heat desert environment with low relative humidity, the further corrosion would be prevented by the corrosion product film formed on the surface. The corrosion of 7 A85 aluminum alloy exposed to the damp hot ocean environment will be gradually deepened with the extension of the exposure time.

关 键 词：7A85铝合金 大气腐蚀 湿热海洋大气环境 干热沙漠大气环境 

分 类 号：TG172[金属学及工艺—金属表面处理]