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An additively manufactured magnesium-aluminium alloy withstands seawater corrosion

Version 2 2024-06-02, 23:43
Version 1 2023-10-20, 04:47
journal contribution
posted on 2024-06-02, 23:43 authored by Z Zeng, S Choudhary, M Esmaily, F Benn, T Derra, Y Hora, A Kopp, A Allanore, Nick BirbilisNick Birbilis
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.

History

Journal

npj Materials Degradation

Volume

6

Article number

32

Pagination

1-10

Location

Berlin, Germany

ISSN

2397-2106

eISSN

2397-2106

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Issue

1

Publisher

Springer