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A mechanistic investigation of corrosion-driven organic coating failure on magnesium and its alloys

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

npj Materials Degradation, Volume: 3, Issue: 1

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

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DOI (Published version): 10.1038/s41529-019-0103-4

Abstract

The failure mechanism of model organic coatings from Mg alloy surfaces is characterised by a combination in-situ scanning Kelvin probe analysis and time lapse photography. Initiation of underfilm corrosion by application of group I chloride salts to a penetrative coating defect produces an apparent...

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Published in: npj Materials Degradation
ISSN: 2397-2106
Published: Springer Science and Business Media LLC 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa52740
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spelling 2023-03-17T11:11:39.1978747 v2 52740 2019-11-14 A mechanistic investigation of corrosion-driven organic coating failure on magnesium and its alloys 0d8fc8d44e2a3c88ce61832f66f20d82 0000-0002-3399-5142 Geraint Williams Geraint Williams true false 39169fd86cc835d041cc2770f6507f03 Christos Kousis Christos Kousis true false 56fc1b17ffc3bdf6039dc05c6eba7f2a Hamilton McMurray Hamilton McMurray true false 2019-11-14 MTLS The failure mechanism of model organic coatings from Mg alloy surfaces is characterised by a combination in-situ scanning Kelvin probe analysis and time lapse photography. Initiation of underfilm corrosion by application of group I chloride salts to a penetrative coating defect produces an apparent cathodic-driven coating delamination, where the disbondment distance increases linearly with time at high relative humidity, although filiform corrosion (FFC) is also observed in the vicinity of the defect. The disbondment process occurs both in the presence and absence of oxygen, indicating that hydrogen evolution comprises the predominant underfilm cathodic reaction. Post-corrosion elemental analysis of the delaminated region shows an abundance of group I cation, but no chloride. When magnesium chloride or HCl are used to initiate corrosion, then only FFC is produced. The mechanism is discussed in terms of net anodic dissolution at the defect coupled with underfilm cathodic hydrogen evolution, producing organic coating disbondment under conditions where cations are able to transport ionic current within a zone of increased pH. Journal Article npj Materials Degradation 3 1 Springer Science and Business Media LLC 2397-2106 4 12 2019 2019-12-04 10.1038/s41529-019-0103-4 http://dx.doi.org/10.1038/s41529-019-0103-4 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2023-03-17T11:11:39.1978747 2019-11-14T09:42:42.3184209 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Geraint Williams 0000-0002-3399-5142 1 Christos Kousis 2 Hamilton McMurray 3 Patrick Keil 0000-0001-7899-0882 4
title A mechanistic investigation of corrosion-driven organic coating failure on magnesium and its alloys
spellingShingle A mechanistic investigation of corrosion-driven organic coating failure on magnesium and its alloys
Geraint Williams
Christos Kousis
Hamilton McMurray
title_short A mechanistic investigation of corrosion-driven organic coating failure on magnesium and its alloys
title_full A mechanistic investigation of corrosion-driven organic coating failure on magnesium and its alloys
title_fullStr A mechanistic investigation of corrosion-driven organic coating failure on magnesium and its alloys
title_full_unstemmed A mechanistic investigation of corrosion-driven organic coating failure on magnesium and its alloys
title_sort A mechanistic investigation of corrosion-driven organic coating failure on magnesium and its alloys
author_id_str_mv 0d8fc8d44e2a3c88ce61832f66f20d82
39169fd86cc835d041cc2770f6507f03
56fc1b17ffc3bdf6039dc05c6eba7f2a
author_id_fullname_str_mv 0d8fc8d44e2a3c88ce61832f66f20d82_***_Geraint Williams
39169fd86cc835d041cc2770f6507f03_***_Christos Kousis
56fc1b17ffc3bdf6039dc05c6eba7f2a_***_Hamilton McMurray
author Geraint Williams
Christos Kousis
Hamilton McMurray
author2 Geraint Williams
Christos Kousis
Hamilton McMurray
Patrick Keil
format Journal article
container_title npj Materials Degradation
container_volume 3
container_issue 1
publishDate 2019
institution Swansea University
issn 2397-2106
doi_str_mv 10.1038/s41529-019-0103-4
publisher Springer Science and Business Media LLC
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
url http://dx.doi.org/10.1038/s41529-019-0103-4
document_store_str 0
active_str 0
description The failure mechanism of model organic coatings from Mg alloy surfaces is characterised by a combination in-situ scanning Kelvin probe analysis and time lapse photography. Initiation of underfilm corrosion by application of group I chloride salts to a penetrative coating defect produces an apparent cathodic-driven coating delamination, where the disbondment distance increases linearly with time at high relative humidity, although filiform corrosion (FFC) is also observed in the vicinity of the defect. The disbondment process occurs both in the presence and absence of oxygen, indicating that hydrogen evolution comprises the predominant underfilm cathodic reaction. Post-corrosion elemental analysis of the delaminated region shows an abundance of group I cation, but no chloride. When magnesium chloride or HCl are used to initiate corrosion, then only FFC is produced. The mechanism is discussed in terms of net anodic dissolution at the defect coupled with underfilm cathodic hydrogen evolution, producing organic coating disbondment under conditions where cations are able to transport ionic current within a zone of increased pH.
published_date 2019-12-04T04:05:17Z
_version_ 1763753399722967040
score 11.037253

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