Effect of minor addition of Zn on precipitate crystal structures and intergranular corrosion in 6082 Al-Mg-Si alloys

Emad H. Bartawi; Ghada Shaban; Calin D. Marioara; Ehsan Rahimi; Ruben Bjørge; Jonas K. Sunde; Yaiza Gonzalez-Garcia; Randi Holmestad; Rajan Ambat

doi:10.1016/j.corsci.2025.112844

Effect of minor addition of Zn on precipitate crystal structures and intergranular corrosion in 6082 Al-Mg-Si alloys

Emad H. Bartawi^*, Ghada Shaban, Calin D. Marioara, Ehsan Rahimi, Ruben Bjørge, Jonas K. Sunde, Yaiza Gonzalez-Garcia, Randi Holmestad, Rajan Ambat

^*Corresponding author for this work

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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.

Original language	English
Article number	112844
Journal	Corrosion Science
Volume	249
Number of pages	11
ISSN	0010-938X
DOIs	https://doi.org/10.1016/j.corsci.2025.112844
Publication status	Published - 2025

Keywords

Al-Mg-Si alloy
HAADF-STEM
Intergranular corrosion
Precipitate crystal structure
SKPFM

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title = "Effect of minor addition of Zn on precipitate crystal structures and intergranular corrosion in 6082 Al-Mg-Si alloys",

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.",

keywords = "Al-Mg-Si alloy, HAADF-STEM, Intergranular corrosion, Precipitate crystal structure, SKPFM",

author = "Bartawi, {Emad H.} and Ghada Shaban and Marioara, {Calin D.} and Ehsan Rahimi and Ruben Bj{\o}rge and Sunde, {Jonas K.} and Yaiza Gonzalez-Garcia and Randi Holmestad and Rajan Ambat",

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year = "2025",

doi = "10.1016/j.corsci.2025.112844",

language = "English",

volume = "249",

journal = "Corrosion Science",

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TY - JOUR

T1 - Effect of minor addition of Zn on precipitate crystal structures and intergranular corrosion in 6082 Al-Mg-Si alloys

AU - Bartawi, Emad H.

AU - Shaban, Ghada

AU - Marioara, Calin D.

AU - Rahimi, Ehsan

AU - Bjørge, Ruben

AU - Sunde, Jonas K.

AU - Gonzalez-Garcia, Yaiza

AU - Holmestad, Randi

AU - Ambat, Rajan

PY - 2025

Y1 - 2025

N2 - 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.

AB - 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.

KW - Al-Mg-Si alloy

KW - HAADF-STEM

KW - Intergranular corrosion

KW - Precipitate crystal structure

KW - SKPFM

U2 - 10.1016/j.corsci.2025.112844

DO - 10.1016/j.corsci.2025.112844

M3 - Journal article

AN - SCOPUS:86000562675

SN - 0010-938X

VL - 249

JO - Corrosion Science

JF - Corrosion Science

M1 - 112844

ER -

Effect of minor addition of Zn on precipitate crystal structures and intergranular corrosion in 6082 Al-Mg-Si alloys

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