大气环境中飞机构件的电偶腐蚀研究  

Galvanic Corrosion of Aircraft Components in Atmospheric Environment

作　　者：丁清苗[1] 秦永祥 崔艳雨[1] DING Qingmiao;QIN Yongxiang;CUI Yanyu(College of Airport,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学机场学院,天津300300

出　　处：《中国腐蚀与防护学报》2020年第5期455-462,共8页Journal of Chinese Society For Corrosion and Protection

基　　金：2019年天津市研究生科研创新项目(2019YJSS069);中央高校基金项目(3122019107).

摘　　要：基于大型仿真软件COMSOL Multiphysics建立了7050铝合金与AerMet100钢组成的电偶对在大气环境中的腐蚀模拟预测模型。研究了偶对表面的盐负载量、大气环境的相对湿度以及阴阳极面积比对腐蚀行为的影响。结果表明:在大气环境相对湿度为0.91时腐蚀速率最快,当偶对表面盐负载量超过5.7 g/m2时会发生严重腐蚀,改变阴阳极面积比不会引起电极极性逆转,且盐负载量、偶对阴阳极面积比与7050铝合金腐蚀速率均呈现正相关关系。7050 Al-alloy is often used for medium and heavy plate extrusions as aircraft components.Based on large-scale simulation software COMSOL Multiphysics,a corrosion simulation model for the galvanic couple of 7050 Al-alloy and AerMet100 steel in atmospheric environment is established.The effect of salt deposits on the surface of galvanic couple,the relative humidity of atmospheric environment,and the area ratio of the anode to the cathode on the corrosion behavior was investigated respectively.The results show that the corrosion rate is the fastest when the relative humidity of the atmosphere is0.91.When the surface salt deposits exceeds 5.7 g/m2,severe corrosion will occur.Changing the ratio of cathode to anode will not cause the electrode polarity reversal.The corrosion rate of 7050 Al-alloy are positively correlated with the salt deposits and the area ratio of cathode to anode.

关 键 词：7050 Al合金 AERMET100钢 COMSOL 大气电偶腐蚀 

分 类 号：TG174[金属学及工艺—金属表面处理]