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Effect of antimony additions on the microstructure and performance of Zn–Mg–Al alloy coatings
,
Amar Malla ,
Shahin Mehraban,
James Sullivan ,
Mathew Goldsworthy,
James McGettrick,
Richard Johnston ,
Ria Mitchell ,
Clive Challinor
npj Materials Degradation, Volume: 8, Issue: 1
Swansea University Authors:
Daniel Britton, David Penney , Amar Malla , Shahin Mehraban, James Sullivan , Mathew Goldsworthy, Richard Johnston , Ria Mitchell
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DOI (Published version): 10.1038/s41529-024-00481-7
Abstract
Microscopy, electrochemical techniques and mechanical testing are used to investigate the effect of varying antimony additions (0.45–1.8 wt%) on the microstructure and corrosion properties of zinc-magnesium-aluminium coating alloys. Samples were produced by splat casting to produce high cooling rate...
| 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/cronfa66612 |
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| Abstract: |
Microscopy, electrochemical techniques and mechanical testing are used to investigate the effect of varying antimony additions (0.45–1.8 wt%) on the microstructure and corrosion properties of zinc-magnesium-aluminium coating alloys. Samples were produced by splat casting to produce high cooling rates similar to those seen in a continuous galvanising line. X-Ray Microscopy reveals that the Sb additions produce disk-shaped Mg3Sb2 intermetallics, subsequently reducing or eliminating the MgZn2 eutectic. Electrochemical testing in 1 wt% NaCl shows that the Mg3Sb2 phase is cathodic with respect to the bulk alloy with slower oxygen reduction kinetics. The decrease in eutectic content leads to less intense anodic activity. The combined effect is anodic and cathodic deactivation, which leads to a 43% reduction in corrosion rate as measured through LPR compared to the base alloy. This work shows that quaternary additions to ZMA coating alloys can be a potential route to improved corrosion resistance for galvanic protection. |
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| Keywords: |
Characterization and analytical techniques, Metals and alloys, Scanning electron microscopy |
| College: |
Faculty of Science and Engineering |
| Funders: |
We would like to thank both EPSRC (EP/S02252X/1) and Tata Steel for their funding to the COATED Centre for Doctoral Training, as well as Swansea University’s AIM facility, the SPECIFIC Pilot Manufacturing Research Centre and the MACH1 project. |
| Issue: |
1 |