Corrosion resistance of additively manufactured aluminium alloys for marine applications
Journal article, 2024
Additive manufacturing opens new possibilities for designing light-weight structures using aluminium alloys. The microstructure of two Al alloys and their corrosion resistance in NaCl and natural seawater environments were investigated. The newly designed Al-Mn-Cr-Zr based alloy showed a higher corrosion resistance than reference AlSi10Mg alloy in both environments in as printed and heat-treated conditions. The corrosion initiated in the Al matrix along the precipitates in the alloys where the Volta potential difference was found the highest. The coarser microstructure and precipitate composition of the new Al-alloy led to the formation of a resistant passive film which extended the passivity region of the Al-Mn-Cr-Zr alloy compared to the AlSi10Mg alloy. The effect of heat treatment could be seen in the microstructure as more precipitates were found in between the melt pool boundaries, which affected the corrosion initiation and slightly the pitting resistance. Overall, this study shows that a newly designed Al-alloy for additive manufacturing has a suitable corrosion resistance for applications in marine environments.
Author
[Person e86fbc28-95ce-4107-9b3c-0b28e3ed6418 not found]
RISE Research Institutes of Sweden
Linköping University
[Person 7702a297-782b-4d78-8ff4-d2ae94778fe1 not found]
Chalmers, Industrial and Materials Science, Materials and manufacture
Royal Institute of Technology (KTH)
[Person 86184787-1d0c-4ea1-b21f-4b3afbf0aaf9 not found]
RISE Research Institutes of Sweden
[Person 632c6930-c045-416f-863a-066cf7262b64 not found]
RISE Research Institutes of Sweden
[Person 3ec8c3da-b027-4b5b-92dc-7dfdea4f9963 not found]
School of engineering Jönköping university
University of Trento
[Person 458c2887-2994-450d-a9fd-e3d9f179ebd7 not found]
Chalmers, Industrial and Materials Science, Materials and manufacture
npj Materials Degradation
2397-2106 (eISSN)
Vol. 8 1 46Subject Categories (SSIF 2011)
Metallurgy and Metallic Materials
Corrosion Engineering
Areas of Advance
Materials Science
DOI
10.1038/s41529-024-00459-5