Effects of grain boundary chemistry and precipitate structure on intergranular corrosion in Al-Mg-Si alloys doped with Cu and Zn
Emad H. Bartawi (Technical University of Denmark (DTU))
Calin D. Marioara (SINTEF Industry)
Ghada Shaban (Technical University of Denmark (DTU))
Ehsan Rahimi (TU Delft - Team Arjan Mol)
Oleg V. Mishin (Technical University of Denmark (DTU))
Jonas K. Sunde (Hydro Extrusions, Innovation & Technology Precision Tubing)
Yaiza 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
Al-Mg-Si alloys are known as structural materials and are primary alloys in the automotive industry to achieve weight reduction. Shifting toward sustainability, lower energy consumption, and less CO2 emission necessitates recycling. However, the unavoidable accumulation of scrap-related impurities, e.g., Cu and Zn, during the recycling process can influence corrosion resistance of recycled alloys. The results show that Al-Mg-Si alloys containing 0.05 wt% Cu exhibit low intergranular corrosion resistance. The intergranular corrosion resistance of these alloys is notably improved by adding 0.06 wt% Zn. Low concentrations of Cu and Zn are found to strongly affect the crystal structure of hardening precipitates.
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