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Volume 14
Issue 22
10.3390/ma14226756
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Article

Enhanced Long-Term Reliability of Seal DeltaSpot Welded Dissimilar Joint between 6061 Aluminum Alloy and Galvannealed Steel via Excimer Laser Irradiation

by
Sung-Min Joo
1,
Young-Gon Kim
2,
Young-Jin Kwak
3,
Dong Jin Yoo
4,5,
Chang-U Jeong
6,
Jeshin Park
6 and
Min-Suk Oh
4,6,*
1
Department of Naval Architecture and Ocean Engineering, Chosun University, Gwangju 61452, Korea
2
EV Component & Materials R&D Group, Korea Institute of Industrial Technology (KITECH), Gwangju 61012, Korea
3
POSCO Technical Research Laboratories, Gwangyang 545875, Korea
4
Department of Energy Storage/Conversion Engineering of Graduate School, Jeonbuk National University, Jeonju 54896, Korea
5
Department of Life Science, Hydrogen and Fuel Cell Research Center, Jeonbuk National University, Jeonju 54896, Korea
6
Division of Advanced Materials Engineering and Research Center for Advanced Materials Development, Jeonbuk National University, Jeonju 54896, Korea
*
Author to whom correspondence should be addressed.
Materials 2021, 14(22), 6756; https://doi.org/10.3390/ma14226756
Submission received: 27 September 2021 / Revised: 2 November 2021 / Accepted: 3 November 2021 / Published: 9 November 2021
(This article belongs to the Special Issue Corrosion and Corrosion Inhibition of Metals and Their Alloys)
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Abstract

Structural-adhesive-assisted DeltaSpot welding was used to improve the weldability and mechanical properties of dissimilar joints between 6061 aluminum alloy and galvannealed HSLA steel. Evaluation of the spot-weld-bonded surfaces from lap shear tests after long-term exposure to chloride and a humid atmosphere (5% NaCl, 35 °C) indicated that the long-term mechanical reliability of the dissimilar weld in a corrosive environment depends strongly on the adhesive–Al6061 alloy bond strength. Corrosive electrolyte infiltrated the epoxy-based adhesive/Al alloy interface, disrupting the chemical interactions and decreasing the adhesion via anodic undercutting of the Al alloy. Due to localized electrochemical galvanic reactions, the surrounding nugget matrix suffered accelerated anodic dissolution, resulting in an Al6061-T6 alloy plate with degraded adhesive strength and mechanical properties. KrF excimer laser irradiation of the Al alloy before adhesive bonding removed the weakly bonded native oxidic overlayers and altered the substrate topography. This afforded a low electrolyte permeability and prevented adhesive delamination, thereby enhancing the long-term stability of the chemical interactions between the adhesive and Al alloy substrate. The results demonstrate the application of excimer laser irradiation as a simple and environmentally friendly processing technology for robust adhesion and reliable bonding between 6061 aluminum alloy and galvannealed steel.
Keywords: dissimilar joint; galvanic corrosion; adhesive bonding; excimer laser irradiation dissimilar joint; galvanic corrosion; adhesive bonding; excimer laser irradiation

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MDPI and ACS Style

Joo, S.-M.; Kim, Y.-G.; Kwak, Y.-J.; Yoo, D.J.; Jeong, C.-U.; Park, J.; Oh, M.-S. Enhanced Long-Term Reliability of Seal DeltaSpot Welded Dissimilar Joint between 6061 Aluminum Alloy and Galvannealed Steel via Excimer Laser Irradiation. Materials 2021, 14, 6756. https://doi.org/10.3390/ma14226756

AMA Style

Joo S-M, Kim Y-G, Kwak Y-J, Yoo DJ, Jeong C-U, Park J, Oh M-S. Enhanced Long-Term Reliability of Seal DeltaSpot Welded Dissimilar Joint between 6061 Aluminum Alloy and Galvannealed Steel via Excimer Laser Irradiation. Materials. 2021; 14(22):6756. https://doi.org/10.3390/ma14226756

Chicago/Turabian Style

Joo, Sung-Min, Young-Gon Kim, Young-Jin Kwak, Dong Jin Yoo, Chang-U Jeong, Jeshin Park, and Min-Suk Oh. 2021. "Enhanced Long-Term Reliability of Seal DeltaSpot Welded Dissimilar Joint between 6061 Aluminum Alloy and Galvannealed Steel via Excimer Laser Irradiation" Materials 14, no. 22: 6756. https://doi.org/10.3390/ma14226756

APA Style

Joo, S.-M., Kim, Y.-G., Kwak, Y.-J., Yoo, D. J., Jeong, C.-U., Park, J., & Oh, M.-S. (2021). Enhanced Long-Term Reliability of Seal DeltaSpot Welded Dissimilar Joint between 6061 Aluminum Alloy and Galvannealed Steel via Excimer Laser Irradiation. Materials, 14(22), 6756. https://doi.org/10.3390/ma14226756

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