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The Study of AA2024 De-Alloying Using Luminol Electrogenerated Chemiluminescence Imaging

Natalie Wint, Z. S. Barrett, G. Williams, H. N. McMurray, Geraint Williams Orcid Logo, Hamilton McMurray

Journal of The Electrochemical Society, Volume: 166, Issue: 11, Pages: C3417 - C3430

Swansea University Authors: Natalie Wint, Geraint Williams Orcid Logo, Hamilton McMurray

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DOI (Published version): 10.1149/2.0481911jes

Abstract

This paper describes the use of luminol electrogenerated chemiluminescence (ECL) to image the re-distribution of electrochemically active copper (copper in electrical contact with the substrate) at the surface of AA2024-T351 corroding in NaCl electrolyte. AA2024 samples are thermo-mechanically treat...

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Published in: Journal of The Electrochemical Society
ISSN: 0013-4651 1945-7111
Published: The Electrochemical Society 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa50771
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spelling 2023-02-21T16:24:09.8376220 v2 50771 2019-06-10 The Study of AA2024 De-Alloying Using Luminol Electrogenerated Chemiluminescence Imaging 5be5dcc4b97c78b3063e258add4fff5c Natalie Wint Natalie Wint true false 0d8fc8d44e2a3c88ce61832f66f20d82 0000-0002-3399-5142 Geraint Williams Geraint Williams true false 56fc1b17ffc3bdf6039dc05c6eba7f2a Hamilton McMurray Hamilton McMurray true false 2019-06-10 FGSEN This paper describes the use of luminol electrogenerated chemiluminescence (ECL) to image the re-distribution of electrochemically active copper (copper in electrical contact with the substrate) at the surface of AA2024-T351 corroding in NaCl electrolyte. AA2024 samples are thermo-mechanically treated to produce a macroscopically inhomogeneous distribution of intermetallic particles. The AA2024-T351 samples are allowed to corrode by immersion in 0.51 M aqueous NaCl and (ex-situ) ECL measurements are performed to follow copper re-distribution. Luminol ECL light emission is orders of magnitude more intense on copper than aluminum and macro and microscopic images are obtained to elucidate the re-distribution of electrochemically active copper. S phase de-alloying produces a radical re-distribution of copper on a microstructural scale (1-10 μm) but macroscopic copper distributions (1-10 mm) remain largely unchanged. In-situ experiments using the SVET show that macroscopic copper distribution directs localization of corrosive attack such that net anodic activity (pitting/intergranular attack) is concentrated in regions with lowest surface coverage of copper and net cathodic activity is concentrated in regions of highest coverage. Results are explained in terms of the role of solution chemistry and pH in influencing the transition from transient to stable pitting. Journal Article Journal of The Electrochemical Society 166 11 C3417 C3430 The Electrochemical Society 0013-4651 1945-7111 carbon 19 6 2019 2019-06-19 10.1149/2.0481911jes COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2023-02-21T16:24:09.8376220 2019-06-10T09:10:17.4670763 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Natalie Wint 1 Z. S. Barrett 2 G. Williams 3 H. N. McMurray 4 Geraint Williams 0000-0002-3399-5142 5 Hamilton McMurray 6 0050771-04072019105616.pdf wint2019(7)v2.pdf 2019-07-04T10:56:16.5530000 Output 2299382 application/pdf Version of Record true 2019-07-04T00:00:00.0000000 Distributed under the terms of Creative Commons Attribution 4.0 International (CC BY 4.0) License true eng http://creativecommons.org/licenses/by/4.0/
title The Study of AA2024 De-Alloying Using Luminol Electrogenerated Chemiluminescence Imaging
spellingShingle The Study of AA2024 De-Alloying Using Luminol Electrogenerated Chemiluminescence Imaging
Natalie Wint
Geraint Williams
Hamilton McMurray
title_short The Study of AA2024 De-Alloying Using Luminol Electrogenerated Chemiluminescence Imaging
title_full The Study of AA2024 De-Alloying Using Luminol Electrogenerated Chemiluminescence Imaging
title_fullStr The Study of AA2024 De-Alloying Using Luminol Electrogenerated Chemiluminescence Imaging
title_full_unstemmed The Study of AA2024 De-Alloying Using Luminol Electrogenerated Chemiluminescence Imaging
title_sort The Study of AA2024 De-Alloying Using Luminol Electrogenerated Chemiluminescence Imaging
author_id_str_mv 5be5dcc4b97c78b3063e258add4fff5c
0d8fc8d44e2a3c88ce61832f66f20d82
56fc1b17ffc3bdf6039dc05c6eba7f2a
author_id_fullname_str_mv 5be5dcc4b97c78b3063e258add4fff5c_***_Natalie Wint
0d8fc8d44e2a3c88ce61832f66f20d82_***_Geraint Williams
56fc1b17ffc3bdf6039dc05c6eba7f2a_***_Hamilton McMurray
author Natalie Wint
Geraint Williams
Hamilton McMurray
author2 Natalie Wint
Z. S. Barrett
G. Williams
H. N. McMurray
Geraint Williams
Hamilton McMurray
format Journal article
container_title Journal of The Electrochemical Society
container_volume 166
container_issue 11
container_start_page C3417
publishDate 2019
institution Swansea University
issn 0013-4651
1945-7111
doi_str_mv 10.1149/2.0481911jes
publisher The Electrochemical Society
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description This paper describes the use of luminol electrogenerated chemiluminescence (ECL) to image the re-distribution of electrochemically active copper (copper in electrical contact with the substrate) at the surface of AA2024-T351 corroding in NaCl electrolyte. AA2024 samples are thermo-mechanically treated to produce a macroscopically inhomogeneous distribution of intermetallic particles. The AA2024-T351 samples are allowed to corrode by immersion in 0.51 M aqueous NaCl and (ex-situ) ECL measurements are performed to follow copper re-distribution. Luminol ECL light emission is orders of magnitude more intense on copper than aluminum and macro and microscopic images are obtained to elucidate the re-distribution of electrochemically active copper. S phase de-alloying produces a radical re-distribution of copper on a microstructural scale (1-10 μm) but macroscopic copper distributions (1-10 mm) remain largely unchanged. In-situ experiments using the SVET show that macroscopic copper distribution directs localization of corrosive attack such that net anodic activity (pitting/intergranular attack) is concentrated in regions with lowest surface coverage of copper and net cathodic activity is concentrated in regions of highest coverage. Results are explained in terms of the role of solution chemistry and pH in influencing the transition from transient to stable pitting.
published_date 2019-06-19T04:02:23Z
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