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Mechanistic investigation on the influence of coating weights on the corrosion behaviour of hot-dip-galvanised Zn-Mg-Al coatings
,
James Sullivan ,
David Penney ,
M. Goldsworthy,
D. Britton ,
Geraint Williams ,
F. Goodwin ,
A. P. Cardoso
npj Materials Degradation, Volume: 8, Issue: 1
Swansea University Authors:
Amar Malla , James Sullivan , David Penney , Geraint Williams
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DOI (Published version): 10.1038/s41529-024-00494-2
Abstract
Time-lapse Microscopy, scanning vibrating electrode technique and potentiodynamic methods were used to study the influence of increasing coating weight (80–310 gm–2) on microstructure, cut-edge and surface corrosion of Zn-Mg-Al coatings in 0.17 M NaCl. Cut-edge corrosion was similar for all coatings...
| Published in: | npj Materials Degradation |
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| ISSN: | 2397-2106 |
| Published: |
Springer Science and Business Media LLC
2024
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa67467 |
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| Abstract: |
Time-lapse Microscopy, scanning vibrating electrode technique and potentiodynamic methods were used to study the influence of increasing coating weight (80–310 gm–2) on microstructure, cut-edge and surface corrosion of Zn-Mg-Al coatings in 0.17 M NaCl. Cut-edge corrosion was similar for all coatings due to the oxygen reduction reaction becoming diffusion-limited. A 64% reduction in surface corrosion was observed for high coating weights through increases in eutectic volume fraction. Spatial and temporal corrosion mechanisms were controlled by microstructural morphological differences as coating weight varied. 80 g.m–2 coatings demonstrated lateral anodic spreading potentially reducing coating penetration rates despite their higher surface corrosion rate. |
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| College: |
Faculty of Science and Engineering |
| Funders: |
We would like to thank the Galvanized Autobody Partnership programme for funding and its associated members for their valuable input. The authors would also like to thank Tata Steel UK for providing samples. |
| Issue: |
1 |