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Studies of the anodic dissolution of aluminium alloys containing tin and gallium using imaging with a high-speed camera

Studies of the anodic dissolution of aluminium alloys containing tin and gallium using imaging with a high-speed camera
Studies of the anodic dissolution of aluminium alloys containing tin and gallium using imaging with a high-speed camera
Imaging with a high-speed camera at a resolution of 10–20 ?m has been used for the direct observation of the anodic dissolution of aluminium alloys containing Sn and Ga. The imaging allows confirmation that hydrogen bubble evolution occurs from the Sn inclusions within rounded pits during both open circuit corrosion and anodic dissolution. Using microelectrodes with only a few Sn inclusions in their surface, it is shown that the evolution of H2 is not continuous and may be correlated with a potential oscillations between ?1.50 V (where H2 evolution occurs) and significantly less negative potentials (where no H2 is evolved). It is proposed that this potential shift is associated with pH changes resulting from H2 evolution itself.
high-speed camera, Sn and Ga, microelectrodes, aluminium alloys
0013-4686
6668-6673
Birkin, Peter R.
ba466560-f27c-418d-89fc-67ea4f81d0a7
Nestoridi, Maria
6de93454-8d1a-4aea-99c6-b0bb165a2718
Pletcher, Derek
f22ebe69-b859-4a89-80b0-9e190e6f8f30
Birkin, Peter R.
ba466560-f27c-418d-89fc-67ea4f81d0a7
Nestoridi, Maria
6de93454-8d1a-4aea-99c6-b0bb165a2718
Pletcher, Derek
f22ebe69-b859-4a89-80b0-9e190e6f8f30

Birkin, Peter R., Nestoridi, Maria and Pletcher, Derek (2009) Studies of the anodic dissolution of aluminium alloys containing tin and gallium using imaging with a high-speed camera. Electrochimica Acta, 54 (26), 6668-6673. (doi:10.1016/j.electacta.2009.06.057).

Record type: Article

Abstract

Imaging with a high-speed camera at a resolution of 10–20 ?m has been used for the direct observation of the anodic dissolution of aluminium alloys containing Sn and Ga. The imaging allows confirmation that hydrogen bubble evolution occurs from the Sn inclusions within rounded pits during both open circuit corrosion and anodic dissolution. Using microelectrodes with only a few Sn inclusions in their surface, it is shown that the evolution of H2 is not continuous and may be correlated with a potential oscillations between ?1.50 V (where H2 evolution occurs) and significantly less negative potentials (where no H2 is evolved). It is proposed that this potential shift is associated with pH changes resulting from H2 evolution itself.

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More information

Published date: 1 November 2009
Keywords: high-speed camera, Sn and Ga, microelectrodes, aluminium alloys

Identifiers

Local EPrints ID: 148661
URI: https://eprints.soton.ac.uk/id/eprint/148661
ISSN: 0013-4686
PURE UUID: 6b26fe84-138a-4e49-8e63-a74861afbc5b
ORCID for Peter R. Birkin: ORCID iD orcid.org/0000-0002-6656-4074

Catalogue record

Date deposited: 29 Apr 2010 15:55
Last modified: 14 Jul 2018 00:36

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