您目前所在的位置:首页 - 期刊简介 - 详细页面

铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 2    April 2003

[PDF Download]    [Flash Online]

    

Investigation of exfoliation corrosion of rolled AA8090 Al-Li  alloy using electrochemical
 impedance spectroscopy
LI Jin-feng(李劲风)1, ZHANG Zhao(张 昭)1
CAO Fa-he(曹发和)1, CHENG Ying-liang(程英亮)1
ZHANG Jian-qing(张鉴清)1, 2, CAO Chu-n

1. Department of Chemistry, Zhejiang University, 
Hangzhou 310027, China; 
2. State Key Laboratory for Corrosion and Protection, 
Institute of Metal Research, Chinese Academy of Sciences, 
Shenyang 110016, China

Abstract:The exfoliation morphologies and electrochemical impedance spectroscopy (EIS) features of as-received rolled AA8090 Al-Li alloy in EXCO solution were studied. The EIS was simulated using an equivalent circuit. The results show that once the exfoliation occurs, the EIS is composed of two capacitive arcs at high frequency and mediate-low frequency; among them, the capacitance corresponding to high frequency (C1) is originated from original flat alloy surface, while the capacitance corresponding to mediate-low frequency (C2) from new interface exposed to EXCO solution due to the exfoliation and the ratio of C2 to C1 increases with exfoliation degree. It is advanced that the exfoliation degree can be quantitatively judged through this ratio.

 

Key words:  rolled AA8090 Al-Li alloy; exfoliation degree; electrochemical impedance spectroscopy (EIS)

ISSN 1672-7029
CN 43-1423/U

主管:中华人民共和国教育部 主办:中南大学 中国铁道学会 承办:中南大学
湘ICP备09001153号 版权所有:《铁道科学与工程学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市韶山南路22号 邮编:410075
电 话:0731-82655133,82656174   传真:0731-82655133   电子邮箱:jrse@mail.csu.edu.cn