Abstract
The intergranular corrosion (IGC) resistance of the Al–Mg–Si alloy with low Zn addition treated by the interrupted aging treatment (T6I6) was investigated. The IGC results of the Al–Mg–Si alloy show that IGC resistance is enhanced by T6I6 aging treatment. The EIS results reveal that the T6I6-treated Al–Mg–Si alloy has lower double layer capacitance and higher charge transfer resistance than the T6-treated alloy. The superior IGC performance of the T6I6-treated alloy may be attributed to the finer and more densely distributed precipitates within the grains, smaller and discretely distributed precipitates along the grain boundaries and narrower precipitate-free zones (PFZs) compared to the T6-treated alloy.
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Acknowledgments
This work was supported by the National Key R&D Program of China (Project No. 2016YFB0300901), the Laboratory stability support funding from National Key Laboratory of Science and Technology for National Defense on High-Strength Structural Materials of China, and the National Science Foundation of China (Project No. 51705539). The authors would like to take this opportunity to express their appreciation.
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Manuscript submitted March 9, 2021, accepted August 9, 2021.
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Xu, X., Deng, Y., Pan, Q. et al. Enhancing the Intergranular Corrosion Resistance of the Al–Mg–Si Alloy with Low Zn Content by the Interrupted Aging Treatment. Metall Mater Trans A 52, 4907–4921 (2021). https://doi.org/10.1007/s11661-021-06433-z
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DOI: https://doi.org/10.1007/s11661-021-06433-z