Effect of minor addition of Zn on precipitate crystal structures and intergranular corrosion in 6082 Al-Mg-Si alloys
Emad H. Bartawi (Technical University of Denmark (DTU))
Ghada Shaban (Technical University of Denmark (DTU))
Calin D. Marioara (SINTEF Industry)
E. Rahimi (TU Delft - Team Arjan Mol)
Ruben Bjørge (SINTEF Industry)
Jonas K. Sunde (Hydro, Innovation & Technology)
Y. Gonzalez Garcia (TU Delft - Team Yaiza Gonzalez Garcia)
Randi Holmestad (Norwegian University of Science and Technology (NTNU))
Rajan Ambat (Technical University of Denmark (DTU))
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Abstract
Recycling Al alloys promotes greater sustainability, as the energy required to produce recycled alloys is only about 5 % of that needed to produce the same amount of primary alloys. However, the build-up of impurities, such as Zn, during the recycling process can negatively affect the corrosion resistance of recycled alloys. The results show that the susceptibility to intergranular corrosion increased with minor additions of zinc (≤ 0.06 wt%). Zn was found to segregate along the grain boundaries, and the STEM-EDS results indicate that the Zn incorporates into the structure of Mg-Si containing grain boundary precipitates.
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