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The kinetics and mechanism of filiform corrosion affecting organic coated Mg alloy surfaces

Christos Kousis, Patrick Keil, Hamilton McMurray, Geraint Williams Orcid Logo

Corrosion Science, Volume: 206, Start page: 110477

Swansea University Authors: Christos Kousis, Hamilton McMurray, Geraint Williams Orcid Logo

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DOI (Published version): 10.1016/j.corsci.2022.110477

Abstract

The filiform corrosion (FFC) of organic coated magnesium alloys is investigated using in-situ scanning Kelvin probe and time-lapse photography. FFC is initiated by injecting MgCl2, HCl and FeCl2 into a coating defect and ensuing FFC propagation rates are shown to increase as a logarithmic function o...

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Published in: Corrosion Science
ISSN: 0010-938X
Published: Elsevier BV 2022
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa60454
first_indexed 2022-07-12T08:57:02Z
last_indexed 2023-01-13T19:20:35Z
id cronfa60454
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spelling 2022-09-07T13:05:57.1023007 v2 60454 2022-07-12 The kinetics and mechanism of filiform corrosion affecting organic coated Mg alloy surfaces 39169fd86cc835d041cc2770f6507f03 Christos Kousis Christos Kousis true false 56fc1b17ffc3bdf6039dc05c6eba7f2a Hamilton McMurray Hamilton McMurray true false 0d8fc8d44e2a3c88ce61832f66f20d82 0000-0002-3399-5142 Geraint Williams Geraint Williams true false 2022-07-12 The filiform corrosion (FFC) of organic coated magnesium alloys is investigated using in-situ scanning Kelvin probe and time-lapse photography. FFC is initiated by injecting MgCl2, HCl and FeCl2 into a coating defect and ensuing FFC propagation rates are shown to increase as a logarithmic function of the chloride ion concentration and are strongly dependent on relative humidity. Post-corrosion surface analysis shows chloride abundance near the filament leading edge and evidence of sequestration within corroded regions behind. The FFC mechanism is consistent with chloride-induced anodic dissolution at the front coupling with water reduction on a cathodically-activated corroded surface behind. Journal Article Corrosion Science 206 110477 Elsevier BV 0010-938X Magnesium alloy; organic coating; anodic disbondment; filiform corrosion 1 9 2022 2022-09-01 10.1016/j.corsci.2022.110477 Data availability:The raw/processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study. COLLEGE NANME COLLEGE CODE Swansea University SU Library paid the OA fee (TA Institutional Deal) EPSRC-funded Centre for Doctoral Training in advanced functional coatings (COATED2): EP/L015099/1 2022-09-07T13:05:57.1023007 2022-07-12T09:53:20.5486533 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Christos Kousis 1 Patrick Keil 2 Hamilton McMurray 3 Geraint Williams 0000-0002-3399-5142 4 60454__24816__aea56f1641f74b48a1f3110ced9a0642.pdf 60454.pdf 2022-08-03T11:45:23.5972536 Output 7791157 application/pdf Version of Record true © 2022 The Authors. This is an open access article under the CC BY license true eng http://creativecommons.org/licenses/by/4.0/
title The kinetics and mechanism of filiform corrosion affecting organic coated Mg alloy surfaces
spellingShingle The kinetics and mechanism of filiform corrosion affecting organic coated Mg alloy surfaces
Christos Kousis
Hamilton McMurray
Geraint Williams
title_short The kinetics and mechanism of filiform corrosion affecting organic coated Mg alloy surfaces
title_full The kinetics and mechanism of filiform corrosion affecting organic coated Mg alloy surfaces
title_fullStr The kinetics and mechanism of filiform corrosion affecting organic coated Mg alloy surfaces
title_full_unstemmed The kinetics and mechanism of filiform corrosion affecting organic coated Mg alloy surfaces
title_sort The kinetics and mechanism of filiform corrosion affecting organic coated Mg alloy surfaces
author_id_str_mv 39169fd86cc835d041cc2770f6507f03
56fc1b17ffc3bdf6039dc05c6eba7f2a
0d8fc8d44e2a3c88ce61832f66f20d82
author_id_fullname_str_mv 39169fd86cc835d041cc2770f6507f03_***_Christos Kousis
56fc1b17ffc3bdf6039dc05c6eba7f2a_***_Hamilton McMurray
0d8fc8d44e2a3c88ce61832f66f20d82_***_Geraint Williams
author Christos Kousis
Hamilton McMurray
Geraint Williams
author2 Christos Kousis
Patrick Keil
Hamilton McMurray
Geraint Williams
format Journal article
container_title Corrosion Science
container_volume 206
container_start_page 110477
publishDate 2022
institution Swansea University
issn 0010-938X
doi_str_mv 10.1016/j.corsci.2022.110477
publisher Elsevier BV
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 - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 1
active_str 0
description The filiform corrosion (FFC) of organic coated magnesium alloys is investigated using in-situ scanning Kelvin probe and time-lapse photography. FFC is initiated by injecting MgCl2, HCl and FeCl2 into a coating defect and ensuing FFC propagation rates are shown to increase as a logarithmic function of the chloride ion concentration and are strongly dependent on relative humidity. Post-corrosion surface analysis shows chloride abundance near the filament leading edge and evidence of sequestration within corroded regions behind. The FFC mechanism is consistent with chloride-induced anodic dissolution at the front coupling with water reduction on a cathodically-activated corroded surface behind.
published_date 2022-09-01T20:13:05Z
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score 11.04748

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