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Influence of Mg and Al alloying additions on the corrosion mechanisms of Hot-dipped Zn-Mg-Al coatings: role of microstructure and phase distribution
,
G. Williams,
D. A. Britton,
F. E. Goodwin,
Ana P. Domingos Cardoso,
T. Richards,
David Penney ,
J. H. Sullivan,
James Sullivan
npj Materials Degradation, Volume: 9, Issue: 1
Swansea University Authors:
Amar Malla , David Penney , James Sullivan
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DOI (Published version): 10.1038/s41529-025-00647-x
Abstract
Systematic investigations into the individual effects of increasing alloying additions of Mg and Al on the corrosion mechanisms of Zn-Mg-Al coatings have demonstrated that microstructural phases and their surface distribution determine the anodic and cathodic behaviour of the coating. Increasing eit...
| Published in: | npj Materials Degradation |
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| ISSN: | 2397-2106 |
| Published: |
Springer Science and Business Media LLC
2025
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| Online Access: |
Check full text
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa70063 |
| Abstract: |
Systematic investigations into the individual effects of increasing alloying additions of Mg and Al on the corrosion mechanisms of Zn-Mg-Al coatings have demonstrated that microstructural phases and their surface distribution determine the anodic and cathodic behaviour of the coating. Increasing either Al and/or Mg from 1 to 3 wt.% improved the surface corrosion performance of the coating, with a greater effect observed for Al additions due to anodic deactivation. Mg additions led to cathodic deactivation due to a significant reduction in Zn dendrites at the surface. The corrosion rate was minimised by maximising the ternary eutectic area fraction at the coating surface. A 52% and 32% decrease in SVET-derived metal loss is achieved at 3 wt.% increase in Al and Mg, respectively. |
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| College: |
Faculty of Science and Engineering |
| Funders: |
Galvanised Autobody Partnership programme |
| Issue: |
1 |