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Studying the Influence of Mg Content on the Microstructure and Associated Localized Corrosion Behavior of Zn-Mg PVD Coatings Using SVET-TLI

Rebecca Bolton, Thomas Dunlop, James Sullivan Orcid Logo, Justin Searle Orcid Logo, Helge Heinrich, Ruud Westerwaal, Christiaan Boelsma, Geraint Williams Orcid Logo

Journal of The Electrochemical Society, Volume: 166, Issue: 11, Pages: C3305 - C3315

Swansea University Authors: James Sullivan Orcid Logo, Justin Searle Orcid Logo, Geraint Williams Orcid Logo

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DOI (Published version): 10.1149/2.0391911jes

Abstract

Physical vapour deposited (PVD) zinc and zinc-magnesium coatings are compared to commercial galvanized zinc and zinc-magnesium-aluminum coatings in terms of bare metal corrosion when immersed in chloride-containing solution. A scanning vibrating electrode technique has been augmented to capture phot...

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Published in: Journal of The Electrochemical Society
ISSN: 0013-4651 1945-7111
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa50511
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spelling 2020-10-05T12:28:57.3871450 v2 50511 2019-05-23 Studying the Influence of Mg Content on the Microstructure and Associated Localized Corrosion Behavior of Zn-Mg PVD Coatings Using SVET-TLI 40e32d66748ab74184a31207ab145708 0000-0003-1018-773X James Sullivan James Sullivan true false 0e3f2c3812f181eaed11c45554d4cdd0 0000-0003-1101-075X Justin Searle Justin Searle true false 0d8fc8d44e2a3c88ce61832f66f20d82 0000-0002-3399-5142 Geraint Williams Geraint Williams true false 2019-05-23 MTLS Physical vapour deposited (PVD) zinc and zinc-magnesium coatings are compared to commercial galvanized zinc and zinc-magnesium-aluminum coatings in terms of bare metal corrosion when immersed in chloride-containing solution. A scanning vibrating electrode technique has been augmented to capture photographic images, in-situ, which complement the spatially and temporally resolved electrochemical data by providing visual evidence of corrosion events and their subsequent stabilization or propagation over the surface. Hot dip galvanized zinc coatings demonstrate heterogeneous localized corrosion behavior, contrary to the general corrosion of the PVD pure zinc layer. The PVD coating containing 4 wt% magnesium has a discrete microstructure much finer than the structure of hot dip zinc-magnesium-aluminum coatings, which results in smaller and more abundant anodic features. Increasing the magnesium content in PVD zinc-magnesium to 10 wt% coatings increases the relative size of the anodic events and reduces the number observed accordingly. A further increase in magnesium content to 20 wt% sees a reduction in anode size and evidence of de-activation during the experiment. A clear correlation between magnesium content and the intensity of characteristic staining on the PVD coatings is also observed. Journal Article Journal of The Electrochemical Society 166 11 C3305 C3315 0013-4651 1945-7111 31 12 2019 2019-12-31 10.1149/2.0391911jes COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2020-10-05T12:28:57.3871450 2019-05-23T15:16:49.9540333 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Rebecca Bolton 1 Thomas Dunlop 2 James Sullivan 0000-0003-1018-773X 3 Justin Searle 0000-0003-1101-075X 4 Helge Heinrich 5 Ruud Westerwaal 6 Christiaan Boelsma 7 Geraint Williams 0000-0002-3399-5142 8 0050511-07062019141649.pdf bolton2019(2)v2.pdf 2019-06-07T14:16:49.8300000 Output 6609967 application/pdf Version of Record true 2019-06-07T00:00:00.0000000 Distributed under the terms of a Creative Commons Attribution (CC-BY-4.0) true eng
title Studying the Influence of Mg Content on the Microstructure and Associated Localized Corrosion Behavior of Zn-Mg PVD Coatings Using SVET-TLI
spellingShingle Studying the Influence of Mg Content on the Microstructure and Associated Localized Corrosion Behavior of Zn-Mg PVD Coatings Using SVET-TLI
James Sullivan
Justin Searle
Geraint Williams
title_short Studying the Influence of Mg Content on the Microstructure and Associated Localized Corrosion Behavior of Zn-Mg PVD Coatings Using SVET-TLI
title_full Studying the Influence of Mg Content on the Microstructure and Associated Localized Corrosion Behavior of Zn-Mg PVD Coatings Using SVET-TLI
title_fullStr Studying the Influence of Mg Content on the Microstructure and Associated Localized Corrosion Behavior of Zn-Mg PVD Coatings Using SVET-TLI
title_full_unstemmed Studying the Influence of Mg Content on the Microstructure and Associated Localized Corrosion Behavior of Zn-Mg PVD Coatings Using SVET-TLI
title_sort Studying the Influence of Mg Content on the Microstructure and Associated Localized Corrosion Behavior of Zn-Mg PVD Coatings Using SVET-TLI
author_id_str_mv 40e32d66748ab74184a31207ab145708
0e3f2c3812f181eaed11c45554d4cdd0
0d8fc8d44e2a3c88ce61832f66f20d82
author_id_fullname_str_mv 40e32d66748ab74184a31207ab145708_***_James Sullivan
0e3f2c3812f181eaed11c45554d4cdd0_***_Justin Searle
0d8fc8d44e2a3c88ce61832f66f20d82_***_Geraint Williams
author James Sullivan
Justin Searle
Geraint Williams
author2 Rebecca Bolton
Thomas Dunlop
James Sullivan
Justin Searle
Helge Heinrich
Ruud Westerwaal
Christiaan Boelsma
Geraint Williams
format Journal article
container_title Journal of The Electrochemical Society
container_volume 166
container_issue 11
container_start_page C3305
publishDate 2019
institution Swansea University
issn 0013-4651
1945-7111
doi_str_mv 10.1149/2.0391911jes
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
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description Physical vapour deposited (PVD) zinc and zinc-magnesium coatings are compared to commercial galvanized zinc and zinc-magnesium-aluminum coatings in terms of bare metal corrosion when immersed in chloride-containing solution. A scanning vibrating electrode technique has been augmented to capture photographic images, in-situ, which complement the spatially and temporally resolved electrochemical data by providing visual evidence of corrosion events and their subsequent stabilization or propagation over the surface. Hot dip galvanized zinc coatings demonstrate heterogeneous localized corrosion behavior, contrary to the general corrosion of the PVD pure zinc layer. The PVD coating containing 4 wt% magnesium has a discrete microstructure much finer than the structure of hot dip zinc-magnesium-aluminum coatings, which results in smaller and more abundant anodic features. Increasing the magnesium content in PVD zinc-magnesium to 10 wt% coatings increases the relative size of the anodic events and reduces the number observed accordingly. A further increase in magnesium content to 20 wt% sees a reduction in anode size and evidence of de-activation during the experiment. A clear correlation between magnesium content and the intensity of characteristic staining on the PVD coatings is also observed.
published_date 2019-12-31T04:01:59Z
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score 11.037603

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