An additively manufactured magnesium-aluminium alloy withstands seawater corrosion
Name
s41529-022-00241-5.pdf
Description
Published version
Size
3.1 MB
Format
Adobe PDF
Checksum (MD5)
82eb586cd5f57557b044e77a448f776c
Author(s)
Zeng, Zhuoran
Choudhary, Sanjay
Esmaily, Marco
Benn, Felix
Derra, Thomas
Hora, Yvonne
Kopp, Alexander
Allanore, Antoine
Birbilis, Nick
Date Issued
December 2022
Journal
npj Materials Degradation
Publisher
Springer Science and Business Media LLC
Citation
Zeng, Zhuoran, Choudhary, Sanjay, Esmaily, Marco, Benn, Felix, Derra, Thomas et al. 2022. "An additively manufactured magnesium-aluminium alloy withstands seawater corrosion." npj Materials Degradation, 6 (1).
Version
Final published version
Abstract
AbstractMagnesium, the lightest structural metal, has inherently poor corrosion resistance. In this study, we developed a magnesium-aluminium Mg-10.6Al-0.6Zn-0.3Mn alloy, additively manufactured by laser powder bed fusion. We reveal that this alloy has a record low degradation rate amongst all magnesium alloys in practically relevant corrosive solutions, and it even withstands seawater corrosion. As tested by a number of methods, the alloy shows even more enhanced passivation with longer immersion periods. The alloy surface following immersion maintained a nearly corrosion-free appearance and was determined to have a thin aluminium-containing surface film, due to surface enrichment of aluminium from the supersaturated matrix. Aluminium enrichment near the sample surface was also observed when the sample is immersed in phosphoric acid or exposed to atmosphere at room temperature. This study demonstrates the prospects for additively manufactured ultra-lightweight magnesium structure with outstanding corrosion resistance.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Terms of Use
Creative Commons Attribution 4.0 International License
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1038/s41529-022-00241-5
