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The kinetics and mechanism of filiform corrosion affecting organic coated Mg alloy surfaces
Corrosion Science, Volume: 206, Start page: 110477
Swansea University Authors: Christos Kousis, Hamilton McMurray, Geraint Williams
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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...
Published in: | Corrosion Science |
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ISSN: | 0010-938X |
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Elsevier BV
2022
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URI: | https://cronfa.swan.ac.uk/Record/cronfa60454 |
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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 FGSEN 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 Science and Engineering - Faculty COLLEGE CODE FGSEN 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 |
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facultyofscienceandengineering |
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Faculty of Science and Engineering |
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facultyofscienceandengineering |
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Faculty of Science and Engineering |
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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 |
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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 |
2022-09-01T04:18:34Z |
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1763754235598471168 |
score |
11.016235 |