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The ability of Mg2Ge crystals to behave as ‘smart release’ inhibitors of the aqueous corrosion of Zn-Al-Mg alloys
,
Shahin Mehraban,
Tom Dunlop ,
James Sullivan ,
David Penney ,
Geraint Williams ,
Hamilton McMurray
Corrosion Science, Volume: 179, Start page: 109091
Swansea University Authors:
Natalie Wint, Amar Malla, Tim Savill , Shahin Mehraban, Tom Dunlop , James Sullivan , David Penney , Geraint Williams , Hamilton McMurray
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DOI (Published version): 10.1016/j.corsci.2020.109091
Abstract
In-situ scanning vibrating electrode technique and time-lapse microscopy are used to investigate the influence of germanium additions (0.19-1.8 wt.%) on the corrosion performance of zinc-aluminium-magnesium model alloys immersed in 0.17 mol.dm-3 NaCl. The addition of Ge results in the formation of M...
| Published in: | Corrosion Science |
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| ISSN: | 0010-938X |
| Published: |
Elsevier BV
2021
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa55603 |
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| Abstract: |
In-situ scanning vibrating electrode technique and time-lapse microscopy are used to investigate the influence of germanium additions (0.19-1.8 wt.%) on the corrosion performance of zinc-aluminium-magnesium model alloys immersed in 0.17 mol.dm-3 NaCl. The addition of Ge results in the formation of Mg2Ge and a decrease in the fractional area of eutectic phase. A 58 % decrease in SVET derived mass loss is achieved at 1.8 wt.% Ge. It is proposed that Mg2Ge crystals are anodically attacked and behave as reservoirs of Mg2+ ions. Mg(OH)2 is precipitated and local electrolyte pH stabilises to values at which the zinc surface is passive. |
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| Keywords: |
A Alloy, A Metal Coating, A Zinc, A Aluminium, A Magnesium, C De alloying |
| College: |
Faculty of Science and Engineering |
| Start Page: |
109091 |