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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, Amar Malla, N. Cooze, Tim Savill, 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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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