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Electrochemical corrosion behaviors of a stress-aged Al–Zn–Mg–Cu alloy

Published online by Cambridge University Press:  24 June 2016

Y.C. Lin ,
Jin-Long Zhang ,
Ming-Song Chen ,
Ying Zhou  and
Xiang Ma
Y.C. Lin*
Affiliation:
School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan Province, China; Light Alloy Research Institute, Central South University, Changsha 410083, Hunan Province, China; and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, Hunan Province, China
Jin-Long Zhang
Affiliation:
School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan Province, China; and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, Hunan Province, China
Ming-Song Chen
Affiliation:
School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan Province, China; and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, Hunan Province, China
Ying Zhou
Affiliation:
School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan Province, China; and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, Hunan Province, China
Xiang Ma
Affiliation:
SINTEF Materials and Chemistry, Blindern, 0314 Oslo, Norway
*
a) Address all correspondence to this author. e-mail: [email protected], [email protected]
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Abstract

The effects of stress-aging processing on corrosion resistance of an Al–Zn–Mg–Cu alloy were investigated. It is found that the one-stage stress-aged alloy is strongly sensitive to the electrochemical corrosion. The poor corrosion resistance of the one-stage stress-aged alloy can be attributed to fine intragranular aging precipitates and continuous distribution of grain boundary precipitates. Meanwhile, the incomplete precipitation of solute atoms results in high electrochemical activity of aluminum matrix. However, when the alloy is two-stage stress-aged, the corrosion resistance is greatly improved. Furthermore, the corrosion resistance decreases firstly and then increases with increasing the first stage stress-aging temperature. Increasing external stress can enhance the corrosion resistance of the two-stage stress-aged alloy. These phenomena are mainly related to aging precipitates within grains and along grain boundaries. The coarse and relatively low-density intragranular aging precipitates, as well as the discontinuously distributed grain boundary precipitates can enhance the corrosion resistance of the stress-aged alloy.

Keywords

aluminum alloystress-agingmicrostructurecorrosion resistanceelectrochemical impedance spectroscopycyclic polarization
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 16 , 29 August 2016 , pp. 2493 - 2505
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Copyright
Copyright © Materials Research Society 2016 

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