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Combinatorial Studies into the Effect of Thermally Inter-Diffused Magnesium on the Kinetics of Organic Coating Cathodic Delamination from Zinc Galvanized Steel

Natalie Wint, Z. S. Barrett, Hamilton McMurray, Geraint Williams Orcid Logo

Journal of The Electrochemical Society, Volume: 167, Issue: 2, Start page: 021502

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

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DOI (Published version): 10.1149/1945-7111/ab6289

Abstract

This paper describes a high-throughput study into the role of Mg in preventing corrosion driven coating disbondment of organic coatings from Zn-Mg alloy galvanized steel. A graded Mg wedge is applied to a hot-dip zinc galvanised steel substrate using physical vapour deposition, and subsequently anne...

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Published in: Journal of The Electrochemical Society
ISSN: 1945-7111
Published: The Electrochemical Society 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa53211
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spelling 2020-10-27T14:02:26.1710925 v2 53211 2020-01-13 Combinatorial Studies into the Effect of Thermally Inter-Diffused Magnesium on the Kinetics of Organic Coating Cathodic Delamination from Zinc Galvanized Steel 5be5dcc4b97c78b3063e258add4fff5c Natalie Wint Natalie Wint true false 56fc1b17ffc3bdf6039dc05c6eba7f2a Hamilton McMurray Hamilton McMurray true false 0d8fc8d44e2a3c88ce61832f66f20d82 0000-0002-3399-5142 Geraint Williams Geraint Williams true false 2020-01-13 FGSEN This paper describes a high-throughput study into the role of Mg in preventing corrosion driven coating disbondment of organic coatings from Zn-Mg alloy galvanized steel. A graded Mg wedge is applied to a hot-dip zinc galvanised steel substrate using physical vapour deposition, and subsequently annealed to produce metallic inter-diffusion and formation of Mg2Zn11 intermetallic. An overcoat of electrically insulating polyvinyl butyral (PVB) is applied and corrosion is initiated from a penetrative coating defect using an aqueous electrolyte. The variation in Mg coating weight across the wedge facilitates a systematic investigation of the effect of Mg on Volta potential and the rate of corrosion driven cathodic coating disbondment using scanning Kelvin probe (SKP) potentiometry. The rate of cathodic disbondment is shown to decrease rapidly even at very low Mg coating weight (corresponding to 25 nm thickness before annealing). The results are explained in terms of the galvanic polarity of the corrosion cell formed between Zn exposed at the defect site, and the intact Zn-Mg layer at the metal-organic coating interface. Journal Article Journal of The Electrochemical Society 167 2 021502 The Electrochemical Society 1945-7111 9 1 2020 2020-01-09 10.1149/1945-7111/ab6289 COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2020-10-27T14:02:26.1710925 2020-01-13T10:19:36.4566820 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Natalie Wint 1 Z. S. Barrett 2 Hamilton McMurray 3 Geraint Williams 0000-0002-3399-5142 4 53211__16271__f74c19b39cae4d519533c2f875833365.pdf wint2020.pdf 2020-01-13T10:21:08.0804393 Output 1760638 application/pdf Version of Record true Released under the terms of a Creative Commons Attribution 4.0 License (CC-BY). true eng http://creativecommons.org/licenses/ by/4.0/
title Combinatorial Studies into the Effect of Thermally Inter-Diffused Magnesium on the Kinetics of Organic Coating Cathodic Delamination from Zinc Galvanized Steel
spellingShingle Combinatorial Studies into the Effect of Thermally Inter-Diffused Magnesium on the Kinetics of Organic Coating Cathodic Delamination from Zinc Galvanized Steel
Natalie Wint
Hamilton McMurray
Geraint Williams
title_short Combinatorial Studies into the Effect of Thermally Inter-Diffused Magnesium on the Kinetics of Organic Coating Cathodic Delamination from Zinc Galvanized Steel
title_full Combinatorial Studies into the Effect of Thermally Inter-Diffused Magnesium on the Kinetics of Organic Coating Cathodic Delamination from Zinc Galvanized Steel
title_fullStr Combinatorial Studies into the Effect of Thermally Inter-Diffused Magnesium on the Kinetics of Organic Coating Cathodic Delamination from Zinc Galvanized Steel
title_full_unstemmed Combinatorial Studies into the Effect of Thermally Inter-Diffused Magnesium on the Kinetics of Organic Coating Cathodic Delamination from Zinc Galvanized Steel
title_sort Combinatorial Studies into the Effect of Thermally Inter-Diffused Magnesium on the Kinetics of Organic Coating Cathodic Delamination from Zinc Galvanized Steel
author_id_str_mv 5be5dcc4b97c78b3063e258add4fff5c
56fc1b17ffc3bdf6039dc05c6eba7f2a
0d8fc8d44e2a3c88ce61832f66f20d82
author_id_fullname_str_mv 5be5dcc4b97c78b3063e258add4fff5c_***_Natalie Wint
56fc1b17ffc3bdf6039dc05c6eba7f2a_***_Hamilton McMurray
0d8fc8d44e2a3c88ce61832f66f20d82_***_Geraint Williams
author Natalie Wint
Hamilton McMurray
Geraint Williams
author2 Natalie Wint
Z. S. Barrett
Hamilton McMurray
Geraint Williams
format Journal article
container_title Journal of The Electrochemical Society
container_volume 167
container_issue 2
container_start_page 021502
publishDate 2020
institution Swansea University
issn 1945-7111
doi_str_mv 10.1149/1945-7111/ab6289
publisher The Electrochemical Society
college_str Faculty of Science and Engineering
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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 This paper describes a high-throughput study into the role of Mg in preventing corrosion driven coating disbondment of organic coatings from Zn-Mg alloy galvanized steel. A graded Mg wedge is applied to a hot-dip zinc galvanised steel substrate using physical vapour deposition, and subsequently annealed to produce metallic inter-diffusion and formation of Mg2Zn11 intermetallic. An overcoat of electrically insulating polyvinyl butyral (PVB) is applied and corrosion is initiated from a penetrative coating defect using an aqueous electrolyte. The variation in Mg coating weight across the wedge facilitates a systematic investigation of the effect of Mg on Volta potential and the rate of corrosion driven cathodic coating disbondment using scanning Kelvin probe (SKP) potentiometry. The rate of cathodic disbondment is shown to decrease rapidly even at very low Mg coating weight (corresponding to 25 nm thickness before annealing). The results are explained in terms of the galvanic polarity of the corrosion cell formed between Zn exposed at the defect site, and the intact Zn-Mg layer at the metal-organic coating interface.
published_date 2020-01-09T04:06:04Z
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