Localized Corrosion and Stress Corrosion Cracking Behavior of AA7003 in a 3.5 wt% NaCl Aqueous Solution

被引：2
|
作者：
祁星 [1 ,2 ,3 ]
SUN Bin [1 ,2 ,3 ]
CHEN Xiaoming [4 ]
宋仁国 [1 ,2 ,3 ]
机构：
[1] School of Materials Science and Engineering, Changzhou University
[2] Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University
[3] Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University
[4] Key Laboratory of Research on Hydraulic and Hydro-Power Equipment Surface Engineering Technology of Zhejiang Province
来源：
JournalofWuhanUniversityofTechnology(MaterialsScience) | 2020年 / 35卷 / 05期
基金：
中国国家自然科学基金;
关键词：
D O I：
暂无
中图分类号：
TG172 [各种类型的金属腐蚀];
学科分类号：
摘要：
The microstructure,localized corrosion (LC) and stress corrosion cracking (SCC) behavior of 7003 aluminum alloy (AA7003) under various aging treatments (peak aging (PA),double peak aging (DPA),regression and re-aging (RRA)) were investigated by means of transmission electron microscope (TEM),scanning electron microscopy (SEM),electrochemical impendence spectroscopy (EIS) and slow strain rate tensile test.The results of TEM showed a discontinuous distribution of grain boundary precipitates of AA7003 under DPA and RRA treatments,which is beneficial for increasing the resistance of LC and SCC.Meanwhile,LC was found initiating firstly on intermetallics which caused the dissolution of surrounding matrix,then pitting holes were formed and developed into matrix.In addition,the SCC process of AA7003 could be divided into two stages,i e,initial pre-cracking and breeding cracking.The EIS analysis,cross-section morphologies and fracture surfaces of specimens indicated that DPA and RRA treatments significantly decreased the crack growth rate during breeding cracking stage,especially for RRA treatment.
引用
收藏
页码：986 / 995
页数：10
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