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The ability of Mg2Ge crystals to behave as ‘smart release’ inhibitors of the aqueous corrosion of Zn-Al-Mg alloys

Natalie Wint Orcid Logo, Amar Malla, N. Cooze, Tim Savill Orcid Logo, Shahin Mehraban, Tom Dunlop Orcid Logo, James Sullivan Orcid Logo, David Penney Orcid Logo, Geraint Williams Orcid Logo, Hamilton McMurray

Corrosion Science, Volume: 179, Start page: 109091

Swansea University Authors: Natalie Wint Orcid Logo, Amar Malla, Tim Savill Orcid Logo, Shahin Mehraban, Tom Dunlop Orcid Logo, James Sullivan Orcid Logo, David Penney Orcid Logo, Geraint Williams Orcid Logo, Hamilton McMurray

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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 M...

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Published in: Corrosion Science
ISSN: 0010-938X
Published: Elsevier BV 2021
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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.
Keywords: A Alloy, A Metal Coating, A Zinc, A Aluminium, A Magnesium, C De alloying
College: College of Engineering
Start Page: 109091