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Understanding the corrosion behaviour of Al-Mg alloy fabricated using a Laser Powder Bed Fusion (L-PBF) Additive Manufacturing (AM) process

Juan Ignacio Ahuir-Torres, Gregory J. Gibbons, Geoff West, Amit Das Orcid Logo, Hiren R. Kotadia

Journal of Alloys and Compounds, Volume: 969, Start page: 172300

Swansea University Author: Amit Das Orcid Logo

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Abstract

Metal additive manufacturing (AM) is an emerging disruptive technology capable of manufacturing complex shaped components that are difficult to manufacture through conventional methods. However, the corrosion behaviour of AM fabricated parts must be considered for safety critical applications. For t...

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Published in: Journal of Alloys and Compounds
ISSN: 0925-8388 1873-4669
Published: Elsevier BV 2023
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa64683
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Abstract: Metal additive manufacturing (AM) is an emerging disruptive technology capable of manufacturing complex shaped components that are difficult to manufacture through conventional methods. However, the corrosion behaviour of AM fabricated parts must be considered for safety critical applications. For this reason, we have studied the relationship between AM fabricated Scalmalloy (Al-Mg-Sc-Zr) microstructures and their corresponding corrosion behaviours. This comparison has been drawn against a comparable commercial Al-Mg alloy (5182). The corrosion resistance of the samples in salt water was assessed via various electrochemical analytics techniques. It was observed that Scalmalloy produced better corrosion resistance than 5182 Al-alloy. This can be attributed to the spontaneous formation of a passive film on refined AM microstructure and the presence of Sc and Zr, specifically when samples were fabricated with higher density (less porosity). The alloys’ corrosion mechanisms were dependent on immersion time and the microstructural features of the samples.
Keywords: Aluminium, Additive manufacturing, Laser powder bed fusion, Intermetallics, Corrosion, Electrochemical Impedance Spectroscopy
College: Faculty of Science and Engineering
Funders: This work was partially supported by (1) Innovate UK (UK and Canada: enhancing industrial productivity): Powder Formulated Metal Additive Manufactured Actuators (PERFORMA), Grant no. 105613, (2) WMG Centre High Value Manufacturing Catapult, (3) Liverpool John Moore University, Faculty of Engineering and Technology (FET) Pump Prime Awards 2022/23.
Start Page: 172300