Effect of welding thermal cycle on corrosion behavior of 7N01 alloy

被引：1
作者：
Chen, Jingqing [1 ]
Wu, Yu [1 ]
Zhang, Kang [1 ]
机构：
[1] Southwest Jiaotong Univ, Sch Mat Sci & Engn, Key Lab Adv Technol Mat, Minist Educ, Chengdu 610031, Peoples R China
来源：
MATERIALS EXPRESS | 2020年 / 10卷 / 12期
关键词：
Al Alloy; Corrosion Resistance; Welding; Thermal Cycle; AL-ZN; MICROSTRUCTURE EVOLUTION; SC; TEMPERATURE; ADDITIONS; COATINGS; TIME;
D O I：
10.1166/mex.2020.1849
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The Al-Mg-Zn-Cu alloy, 7N01, is an important material that is commonly used in the high-speed train manufacture. In this paper, the relationship between microstructure and the corrosion performance of this alloy after undergoing welding thermal cycling was investigated. The 7N01 alloy was subject to repeated thermal cycling using a Gleeble machine to simulate the welding process. The corrosion mechanism of the post-weld alloy was subsequently investigated via potentiodynamic polarization and intergranular corrosion tests. Transmission electron microscopy analysis was used to determine the amount and concentration of precipitates with different thermal cycles, which caused variance of corrosion potential and the galvanic corrosion. The highest corrosion resistance was observed from the post-weld microstructure with a high eta precipitate content. With natural aging, the precipitates in the microstructure continuously change, resulting in improvement of the corrosion resistance of the 7N01 alloy.
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收藏
页码：2130 / 2142
页数：13
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