Effect of Aging Time on the Corrosion Resistance of the As-cast Al-Cu-Mg-Mn Alloy

被引：8
作者：
Luo, Bin [1 ]
Lu, Kai [2 ]
Zhang, Fan [1 ]
Gao, Wei [3 ]
Zhan, Zhaolin [1 ]
Li, Zulai [1 ]
机构：
[1] Kunming Univ Sci & Technol, Fac Mat Sci & Engn, Kunming 650093, Yunnan, Peoples R China
[2] Yunnan Kaishing Special Met Co Ltd, Qujing 655504, Peoples R China
[3] Univ Auckland, Engn Sch, PB 92019, Auckland 1142, New Zealand
来源：
JOM | 2022年 / 74卷 / 09期
关键词：
D O I：
10.1007/s11837-022-05399-6
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Cast Al-Cu-Mg-Mn alloy, prepared by differential pressure casting method, was quenched at 530 degrees C and aged at 170 degrees C. The effect of aging time on the corrosion resistance of the Al alloy was investigated in 3.5 wt.% NaCl solution by potentiodynamic polarization and electrochemical impedance spectroscopy tests. The results indicated that the aging time had great influence on the distribution of the Al2Cu phase. A small amount of fine second phase had precipitated along grain boundaries to strengthen the alloy when the aging time was 6 h. Extended aging time led to the rapid growth of the second phase. Pitting corrosion occurred at the interface between the Al2Cu phase and alpha-Al matrix in 3.5wt.% NaCl solution. The Al2Cu phase with a small size easily fell off to form corrosion pits during the corrosion process, leading to more serious pitting corrosion. However, a network-like Al2Cu phase prevented its falling off, improving pitting corrosion resistance.
引用
收藏
页码：3616 / 3624
页数：9
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