Influence of aging temperature on corrosion behavior of Al-Zn-Mg-Sc-Zr alloy

被引：64
作者：
Li, Chen [1 ]
Pan, Qinglin [1 ,2 ]
Shi, Yunjia [1 ]
Wang, Ying [1 ]
Li, Bo [1 ]
机构：
[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
[2] Cent S Univ, Minist Educ, Key Lab Nonferrous Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
来源：
MATERIALS & DESIGN | 2014年 / 55卷
关键词：
Non-ferros metals and alloys; Heat treatments; Microstructure; Corrosion; ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; EXFOLIATION CORROSION; ALUMINUM-ALLOY; MICROALLOYING ADDITIONS; MECHANICAL-PROPERTIES; LOCALIZED CORROSION; CU ALLOYS; MICROSTRUCTURE; RECRYSTALLIZATION; YB;
D O I：
10.1016/j.matdes.2013.10.018
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Al-Zn-Mg-Sc-Zr alloy sheets were prepared using water chilling copper mould ingot metallurgy processing which was protected by active flux. The effect of aging temperature on the corrosion characteristics of Al-Zn-Mg-Sc-Zr alloy was investigated by means of exfoliation corrosion testing, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) combined with transmission electron microscopy, scanning electron microscopy and optical microscopy observation. It is found that with increasing the aging temperature the susceptibility to exfoliation corrosion decreases. Electrochemical measurements reveal that at early stage of immersion in testing solution, EIS plots of the samples are composed of a capacitive arc and an inductive loop. Inductive loop disappears with the increasing of immersion time and two time constants in impedance diagrams appear. Moreover, the trends of corrosion resistance are further confirmed by polarization curve and EIS test. In addition, transmission electron microscopy observations show that the improved corrosion resistance from increasing aging temperature is duo to the coarsening of matrix and separated precipitates at the grain boundary, and the increased spacing of grain boundary precipitates. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：551 / 559
页数：9
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