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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
Amar Malla 
,
G. Williams,
D. A. Britton,
F. E. Goodwin,
Ana P. Domingos Cardoso,
T. Richards,
David Penney ,
J. H. Sullivan,
James Sullivan
,
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 |
|---|---|
| ISSN: | 2397-2106 |
| Published: |
Springer Science and Business Media LLC
2025
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa70063 |
| first_indexed |
2025-07-30T22:02:06Z |
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| last_indexed |
2025-08-07T08:12:47Z |
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2025-08-06T15:28:02.6756108 v2 70063 2025-07-30 Influence of Mg and Al alloying additions on the corrosion mechanisms of Hot-dipped Zn-Mg-Al coatings: role of microstructure and phase distribution 51d0d611e98814e99679d9bb21836e3d 0000-0002-9133-7615 Amar Malla Amar Malla true false 869becc35438853f2bca0044df467631 0000-0002-8942-8067 David Penney David Penney true false 40e32d66748ab74184a31207ab145708 0000-0003-1018-773X James Sullivan James Sullivan true false 2025-07-30 EAAS 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. Journal Article npj Materials Degradation 9 1 Springer Science and Business Media LLC 2397-2106 29 7 2025 2025-07-29 10.1038/s41529-025-00647-x COLLEGE NANME Engineering and Applied Sciences School COLLEGE CODE EAAS Swansea University Other Galvanised Autobody Partnership programme 2025-08-06T15:28:02.6756108 2025-07-30T20:45:43.2122790 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Amar Malla 0000-0002-9133-7615 1 G. Williams 2 D. A. Britton 3 F. E. Goodwin 4 Ana P. Domingos Cardoso 5 T. Richards 6 David Penney 0000-0002-8942-8067 7 J. H. Sullivan 8 James Sullivan 0000-0003-1018-773X 9 70063__34918__262a46f2d4744bf996628f2a949ea5ab.pdf 70063.VoR.pdf 2025-08-06T15:22:42.0914639 Output 5438069 application/pdf Version of Record true © The Author(s) 2025. This article is licensed under a Creative Commons Attribution 4.0 International License. true eng http://creativecommons.org/licenses/by/4.0/ |
| title |
Influence of Mg and Al alloying additions on the corrosion mechanisms of Hot-dipped Zn-Mg-Al coatings: role of microstructure and phase distribution |
| spellingShingle |
Influence of Mg and Al alloying additions on the corrosion mechanisms of Hot-dipped Zn-Mg-Al coatings: role of microstructure and phase distribution Amar Malla David Penney James Sullivan |
| title_short |
Influence of Mg and Al alloying additions on the corrosion mechanisms of Hot-dipped Zn-Mg-Al coatings: role of microstructure and phase distribution |
| title_full |
Influence of Mg and Al alloying additions on the corrosion mechanisms of Hot-dipped Zn-Mg-Al coatings: role of microstructure and phase distribution |
| title_fullStr |
Influence of Mg and Al alloying additions on the corrosion mechanisms of Hot-dipped Zn-Mg-Al coatings: role of microstructure and phase distribution |
| title_full_unstemmed |
Influence of Mg and Al alloying additions on the corrosion mechanisms of Hot-dipped Zn-Mg-Al coatings: role of microstructure and phase distribution |
| title_sort |
Influence of Mg and Al alloying additions on the corrosion mechanisms of Hot-dipped Zn-Mg-Al coatings: role of microstructure and phase distribution |
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51d0d611e98814e99679d9bb21836e3d 869becc35438853f2bca0044df467631 40e32d66748ab74184a31207ab145708 |
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51d0d611e98814e99679d9bb21836e3d_***_Amar Malla 869becc35438853f2bca0044df467631_***_David Penney 40e32d66748ab74184a31207ab145708_***_James Sullivan |
| author |
Amar Malla David Penney James Sullivan |
| author2 |
Amar Malla G. Williams D. A. Britton F. E. Goodwin Ana P. Domingos Cardoso T. Richards David Penney J. H. Sullivan James Sullivan |
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npj Materials Degradation |
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9 |
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1 |
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2025 |
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Swansea University |
| issn |
2397-2106 |
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10.1038/s41529-025-00647-x |
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Springer Science and Business Media LLC |
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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. |
| published_date |
2025-07-29T05:29:52Z |
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1851097971219759104 |
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11.089386 |