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

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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.

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ACKNOWLEDGMENTS

This work was supported by the National Natural Science Foundation Council of China (Grant Nos. 51375502 and 51305466), the Project of Innovation-driven Plan in Central South University (No. 2016CX008), the National Key Basic Research Program (Grant No. 2013CB035801), the Natural Science Foundation for Distinguished Young Scholars of Hunan Province (Grant No. 2016JJ1017), and State key laboratory of High Performance Complex Manufacturing (No. zzyjkt2014-01), China.

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Authors and Affiliations

  1. School of Mechanical and Electrical Engineering, Central South University, Changsha, Hunan Province, 410083, China

    Y. C. Lin, Jin-Long Zhang, Ming-Song Chen & Ying Zhou

  2. Light Alloy Research Institute, Central South University, Changsha, Hunan Province, 410083, China

    Y. C. Lin

  3. State Key Laboratory of High Performance Complex Manufacturing, Changsha, Hunan Province, 410083, China

    Y. C. Lin, Jin-Long Zhang, Ming-Song Chen & Ying Zhou

  4. SINTEF Materials and Chemistry, Blindern, 0314, Oslo, Norway

    Xiang Ma

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  1. Y. C. Lin
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Lin, Y.C., Zhang, JL., Chen, MS. et al. Electrochemical corrosion behaviors of a stress-aged Al-Zn-Mg-Cu alloy. Journal of Materials Research 31, 2493–2505 (2016). https://doi.org/10.1557/jmr.2016.232

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