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Performance of a Magnesium-Rich Primer on Pretreated AA2024-T351 in Full Immersion: a Galvanic Throwing Power Investigation Using a Scanning Vibrating Electrode Technique

B. Kannan, C. F. Glover, H. N. McMurray, G. Williams, J. R. Scully, Geraint Williams Orcid Logo, Hamilton McMurray

Journal of The Electrochemical Society, Volume: 165, Issue: 2, Pages: C27 - C41

Swansea University Authors: Geraint Williams Orcid Logo, Hamilton McMurray

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DOI (Published version): 10.1149/2.0711802jes

Abstract

The scanning vibrating electrode technique (SVET) was employed to examine the effect of ‘galvanic throwing power’ and the distance over which a Mg-rich primer (MgRP) provided sacrificial anode-based cathodic protection to AA2024-T351. Three systems were investigated in full immersion conditions wher...

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Published in: Journal of The Electrochemical Society
ISSN: 0013-4651 1945-7111
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa38161
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spelling 2018-03-06T15:09:50.1144090 v2 38161 2018-01-17 Performance of a Magnesium-Rich Primer on Pretreated AA2024-T351 in Full Immersion: a Galvanic Throwing Power Investigation Using a Scanning Vibrating Electrode Technique 0d8fc8d44e2a3c88ce61832f66f20d82 0000-0002-3399-5142 Geraint Williams Geraint Williams true false 56fc1b17ffc3bdf6039dc05c6eba7f2a Hamilton McMurray Hamilton McMurray true false 2018-01-17 MTLS The scanning vibrating electrode technique (SVET) was employed to examine the effect of ‘galvanic throwing power’ and the distance over which a Mg-rich primer (MgRP) provided sacrificial anode-based cathodic protection to AA2024-T351. Three systems were investigated in full immersion conditions where the same MgRP was used with three different pretreatments: Non-film forming (NFF), trivalent chromium pretreatment (TCP) and anodization with a chromate seal (ACS). Experiments were conducted with two coating/defect area ratios and three parameters were monitored: 1) the maximum peak height of local anodes, inferring the location and intensity of pits, 2) the current density profile at the coating/defect interface (CDI) region and 3) total integrated anodic and cathodic current density values of defined areas in the defect region moving progressively away from the CDI. The NFF-based system was shown to provide the superior galvanic throwing power and a quasi-steady-state galvanic current distribution was detected in the defect region adjacent to the CDI indicating enhanced cathodic activity in response to the MgRP. High resistance between the MgRP and the substrate, due to the thickness of the pretreatment layer, appeared to mediate galvanic interactions in the case of TCP and ACS-based systems. Journal Article Journal of The Electrochemical Society 165 2 C27 C41 0013-4651 1945-7111 AA2024-T351, Magnesium, SVET 31 12 2018 2018-12-31 10.1149/2.0711802jes COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2018-03-06T15:09:50.1144090 2018-01-17T10:16:05.3317319 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering B. Kannan 1 C. F. Glover 2 H. N. McMurray 3 G. Williams 4 J. R. Scully 5 Geraint Williams 0000-0002-3399-5142 6 Hamilton McMurray 7 0038161-17012018101843.pdf kannan2018.pdf 2018-01-17T10:18:43.0500000 Output 2303482 application/pdf Version of Record true 2018-01-17T00:00:00.0000000 true eng
title Performance of a Magnesium-Rich Primer on Pretreated AA2024-T351 in Full Immersion: a Galvanic Throwing Power Investigation Using a Scanning Vibrating Electrode Technique
spellingShingle Performance of a Magnesium-Rich Primer on Pretreated AA2024-T351 in Full Immersion: a Galvanic Throwing Power Investigation Using a Scanning Vibrating Electrode Technique
Geraint Williams
Hamilton McMurray
title_short Performance of a Magnesium-Rich Primer on Pretreated AA2024-T351 in Full Immersion: a Galvanic Throwing Power Investigation Using a Scanning Vibrating Electrode Technique
title_full Performance of a Magnesium-Rich Primer on Pretreated AA2024-T351 in Full Immersion: a Galvanic Throwing Power Investigation Using a Scanning Vibrating Electrode Technique
title_fullStr Performance of a Magnesium-Rich Primer on Pretreated AA2024-T351 in Full Immersion: a Galvanic Throwing Power Investigation Using a Scanning Vibrating Electrode Technique
title_full_unstemmed Performance of a Magnesium-Rich Primer on Pretreated AA2024-T351 in Full Immersion: a Galvanic Throwing Power Investigation Using a Scanning Vibrating Electrode Technique
title_sort Performance of a Magnesium-Rich Primer on Pretreated AA2024-T351 in Full Immersion: a Galvanic Throwing Power Investigation Using a Scanning Vibrating Electrode Technique
author_id_str_mv 0d8fc8d44e2a3c88ce61832f66f20d82
56fc1b17ffc3bdf6039dc05c6eba7f2a
author_id_fullname_str_mv 0d8fc8d44e2a3c88ce61832f66f20d82_***_Geraint Williams
56fc1b17ffc3bdf6039dc05c6eba7f2a_***_Hamilton McMurray
author Geraint Williams
Hamilton McMurray
author2 B. Kannan
C. F. Glover
H. N. McMurray
G. Williams
J. R. Scully
Geraint Williams
Hamilton McMurray
format Journal article
container_title Journal of The Electrochemical Society
container_volume 165
container_issue 2
container_start_page C27
publishDate 2018
institution Swansea University
issn 0013-4651
1945-7111
doi_str_mv 10.1149/2.0711802jes
college_str Faculty of Science and Engineering
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hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
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department_str School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 1
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description The scanning vibrating electrode technique (SVET) was employed to examine the effect of ‘galvanic throwing power’ and the distance over which a Mg-rich primer (MgRP) provided sacrificial anode-based cathodic protection to AA2024-T351. Three systems were investigated in full immersion conditions where the same MgRP was used with three different pretreatments: Non-film forming (NFF), trivalent chromium pretreatment (TCP) and anodization with a chromate seal (ACS). Experiments were conducted with two coating/defect area ratios and three parameters were monitored: 1) the maximum peak height of local anodes, inferring the location and intensity of pits, 2) the current density profile at the coating/defect interface (CDI) region and 3) total integrated anodic and cathodic current density values of defined areas in the defect region moving progressively away from the CDI. The NFF-based system was shown to provide the superior galvanic throwing power and a quasi-steady-state galvanic current distribution was detected in the defect region adjacent to the CDI indicating enhanced cathodic activity in response to the MgRP. High resistance between the MgRP and the substrate, due to the thickness of the pretreatment layer, appeared to mediate galvanic interactions in the case of TCP and ACS-based systems.
published_date 2018-12-31T03:48:13Z
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