Study on the Intergranular Corrosion Behavior of Welding Joint of A7N01-T4 Al-Alloy for High-speed Train

被引：3
|
作者：
Wang, Xiaomin [1 ]
Gou, Guoqing [2 ]
Zhao, Junjing [2 ]
Liu, Yan [2 ]
机构：
[1] SW Jiaotong Univ, Sch Life Sci & Engn, Chengdu 610031, Peoples R China
[2] Southwest Jiatong Univ, Coll Mat Sci & Engn, Chengdu 610031, Peoples R China
来源：
MATERIALS AND DESIGN, PTS 1-3 | 2011年 / 284-286卷
关键词：
A7N01-T4 aluminum alloy; welding joint; intergranular corrosion; segregation; ALUMINUM;
D O I：
10.4028/www.scientific.net/AMR.284-286.1594
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
This paper studied the intergranular corrosion behavior of A7N01-T4 Al-alloy and its welding joint through corrosion rate test by chemical analysis and morphology observation by metalloscope, LCSM and element analysis by EDS. The results showed that the corrosion rate of welding joint was higher than that of the base, and HAZ was the worst corrosion part of welding joint. Zn2Mg strengthening phase of HAZ segregated continuously along grain boundary under the affected of heat-input of welding, and the low potential of this zinc-rich phase made it to be anode in corrosion cell and dissolved preferentially, an active corrosion route along grain boundary was formed, which made further corrosion develop into inner alloy.
引用
收藏
页码：1594 / +
页数：2
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