摘要
用电化学噪声表征7075铝合金的模拟大气腐蚀过程,旨在探索电化学噪声方法在航空器腐蚀检测上的应用.用吸附3.5%NaCl电解液的镜头纸紧贴于试样表面以模拟大气腐蚀环境,测试了7075T6铝合金的腐蚀电流、电位随浸泡时间的波动.电化学噪声实验结果显示,腐蚀初期电流波动幅度较小,正负方向幅度相当,腐蚀2 h后;电流波动表现为正向锯齿波,幅度增大到0.3μA左右;6 h后电流表现为幅度不等的负向波动.可以预测2 h后铝合金钝化膜的破坏是腐蚀的主要过程,6 h后钝化膜的修复则占主导地位.
Lens tissue absorbing 3.5 % sodium chloride solution was clung on the surface of sample to simulate atmospheric corrosion. The corrosion current, potential fluctuations of 7075T6 aluminum alloys were measured. It has been observed that amplitude of current fluctuations was rather low in initial corrosion stages. Current fluctuations presented positive zigzag wave after 2 h corrosion, and current showed negative various fluctuations after 6 h. It was possible that breakdown of passive film was the main process after 2 h corrosion, whereas repair of the passive film was dominant after 6 h.
出处
《腐蚀科学与防护技术》
CAS
CSCD
北大核心
2006年第5期386-388,共3页
Corrosion Science and Protection Technology
基金
民航总局2000科研资助项目"航空器隐蔽区域腐蚀状况监测系统"
关键词
铝合金
大气腐蚀
电化学噪声
aluminum alloy
atmospheric corrosion
electrochemical noise
作者简介
刘晓磊（1979-），女．硕士研究生．研究方向为航空材料的腐蚀损伤．Tel：025-52112626 E-mail：xiaoleniu@nuaa．edu．cn
