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The Sacrificial Protection of Steel by Zinc-Containing Sol-Gel Coatings

Geraint Williams Orcid Logo, Hamilton McMurray, Natalie Wint

Journal of The Electrochemical Society, Volume: 166, Issue: 13, Pages: C434 - C444

Swansea University Authors: Geraint Williams Orcid Logo, Hamilton McMurray, Natalie Wint

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DOI (Published version): 10.1149/2.1071913jes

Abstract

The scanning vibrating electrode technique (SVET), electrochemical impedance spectroscopy, and salt spray testing are used to investigate the ability of Zn rich sol-gel coatings to provide sacrificial protection to carbon steel. Three types of coatings (containing either Zn powder, a colored pigment...

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Published in: Journal of The Electrochemical Society
ISSN: 0013-4651 1945-7111
Published: The Electrochemical Society 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa51605
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first_indexed 2019-08-28T14:50:20Z
last_indexed 2019-08-28T14:50:20Z
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spelling 2019-08-28T10:22:29.1725141 v2 51605 2019-08-28 The Sacrificial Protection of Steel by Zinc-Containing Sol-Gel Coatings 0d8fc8d44e2a3c88ce61832f66f20d82 0000-0002-3399-5142 Geraint Williams Geraint Williams true false 56fc1b17ffc3bdf6039dc05c6eba7f2a Hamilton McMurray Hamilton McMurray true false 5be5dcc4b97c78b3063e258add4fff5c Natalie Wint Natalie Wint true false 2019-08-28 MTLS The scanning vibrating electrode technique (SVET), electrochemical impedance spectroscopy, and salt spray testing are used to investigate the ability of Zn rich sol-gel coatings to provide sacrificial protection to carbon steel. Three types of coatings (containing either Zn powder, a colored pigment, or both) are applied to steel. Intact coatings are shown to act as barrier layers through which electrolyte ingresses over time. Under conditions where the substrate is exposed by an artificial coating defect, SVET is used to investigate the extent to which different coatings offer sacrificial protection when the defect size is systematically changed. The total anodic current, as derived using SVET, doubles when the defect covers 25% of the total area compared to when 12% of the area is exposed. This finding is consistent with efficient sacrificial protection of the steel by the zinc based coating. This sacrificial protection is observed for up to 24 hours for cases where the defect constitutes up to 52% of total area. The protection offered in the presence of a colored pigment is delayed and it is proposed that the pigment restricts the ability of Zn to couple with the underlying steel. Journal Article Journal of The Electrochemical Society 166 13 C434 C444 The Electrochemical Society 0013-4651 1945-7111 4 9 2019 2019-09-04 10.1149/2.1071913jes COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2019-08-28T10:22:29.1725141 2019-08-28T10:21:28.6808944 Geraint Williams 0000-0002-3399-5142 1 Hamilton McMurray 2 Natalie Wint 3 51605__15099__471cb5c50e364dcca73042977588f37d.pdf wint2019(9)v3.pdf 2019-08-28T10:22:29.1570000 Output 17544309 application/pdf Accepted Manuscript true 2020-09-04T00:00:00.0000000 true eng
title The Sacrificial Protection of Steel by Zinc-Containing Sol-Gel Coatings
spellingShingle The Sacrificial Protection of Steel by Zinc-Containing Sol-Gel Coatings
Geraint Williams
Hamilton McMurray
Natalie Wint
title_short The Sacrificial Protection of Steel by Zinc-Containing Sol-Gel Coatings
title_full The Sacrificial Protection of Steel by Zinc-Containing Sol-Gel Coatings
title_fullStr The Sacrificial Protection of Steel by Zinc-Containing Sol-Gel Coatings
title_full_unstemmed The Sacrificial Protection of Steel by Zinc-Containing Sol-Gel Coatings
title_sort The Sacrificial Protection of Steel by Zinc-Containing Sol-Gel Coatings
author_id_str_mv 0d8fc8d44e2a3c88ce61832f66f20d82
56fc1b17ffc3bdf6039dc05c6eba7f2a
5be5dcc4b97c78b3063e258add4fff5c
author_id_fullname_str_mv 0d8fc8d44e2a3c88ce61832f66f20d82_***_Geraint Williams
56fc1b17ffc3bdf6039dc05c6eba7f2a_***_Hamilton McMurray
5be5dcc4b97c78b3063e258add4fff5c_***_Natalie Wint
author Geraint Williams
Hamilton McMurray
Natalie Wint
author2 Geraint Williams
Hamilton McMurray
Natalie Wint
format Journal article
container_title Journal of The Electrochemical Society
container_volume 166
container_issue 13
container_start_page C434
publishDate 2019
institution Swansea University
issn 0013-4651
1945-7111
doi_str_mv 10.1149/2.1071913jes
publisher The Electrochemical Society
document_store_str 1
active_str 0
description The scanning vibrating electrode technique (SVET), electrochemical impedance spectroscopy, and salt spray testing are used to investigate the ability of Zn rich sol-gel coatings to provide sacrificial protection to carbon steel. Three types of coatings (containing either Zn powder, a colored pigment, or both) are applied to steel. Intact coatings are shown to act as barrier layers through which electrolyte ingresses over time. Under conditions where the substrate is exposed by an artificial coating defect, SVET is used to investigate the extent to which different coatings offer sacrificial protection when the defect size is systematically changed. The total anodic current, as derived using SVET, doubles when the defect covers 25% of the total area compared to when 12% of the area is exposed. This finding is consistent with efficient sacrificial protection of the steel by the zinc based coating. This sacrificial protection is observed for up to 24 hours for cases where the defect constitutes up to 52% of total area. The protection offered in the presence of a colored pigment is delayed and it is proposed that the pigment restricts the ability of Zn to couple with the underlying steel.
published_date 2019-09-04T04:03:34Z
_version_ 1763753290968858624
score 11.01306

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