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Al2O3 Coatings for Protection of Stainless Steel 316L against Corrosion in Zn-Al and Zn-Al-Mg

Giovanni Alparone, David Penney Orcid Logo, James Sullivan Orcid Logo, James Edy, Christopher Mills Orcid Logo

Coatings, Volume: 14, Issue: 5, Start page: 606

Swansea University Authors: Giovanni Alparone, David Penney Orcid Logo, James Sullivan Orcid Logo

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DOI (Published version): 10.3390/coatings14050606

Abstract

The production and quality of automotive-grade galvanised steel are affected by the limited service life of the pot roll bearings used in continuous galvanising lines. The journal bearings are subjected to severe degradation as they react with the molten Zn bath, and coatings can provide corrosion p...

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Published in: Coatings
ISSN: 2079-6412
Published: MDPI AG 2024
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URI: https://cronfa.swan.ac.uk/Record/cronfa66461
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The journal bearings are subjected to severe degradation as they react with the molten Zn bath, and coatings can provide corrosion protection to the bearing materials. This research investigates the performance of Al2O3 coatings applied via the HVOF thermal spray process to stainless steel 316L substrates. Immersion tests were conducted in baths of different compositions, namely GI (Zn-0.3 wt.% Al) and ZMA (Zn-1.5 wt.% Al-1.5 wt.% Mg). Material characterisation after testing showed evidence of coating degradation after 1 week, as the coating tended to crack and detach from the substrate, allowing the molten Zn to attack the underlying steel. The coefficient of thermal expansion of Al2O3 and steel was measured, and a difference of 13 &#xD7; 10&#x2212;6 K&#x2212;1 was found, leading to the development of cracks in the coatings. Zn penetration through cracks was determined to be the main failure mechanism of the Al2O3 coatings, which otherwise remained inert to Zn-Al. 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spelling 2024-05-17T11:40:24.7309550 v2 66461 2024-05-17 Al2O3 Coatings for Protection of Stainless Steel 316L against Corrosion in Zn-Al and Zn-Al-Mg cb6fbac581782d40bece69ca22ce041a Giovanni Alparone Giovanni Alparone true false 869becc35438853f2bca0044df467631 0000-0002-8942-8067 David Penney David Penney true false 40e32d66748ab74184a31207ab145708 0000-0003-1018-773X James Sullivan James Sullivan true false 2024-05-17 The production and quality of automotive-grade galvanised steel are affected by the limited service life of the pot roll bearings used in continuous galvanising lines. The journal bearings are subjected to severe degradation as they react with the molten Zn bath, and coatings can provide corrosion protection to the bearing materials. This research investigates the performance of Al2O3 coatings applied via the HVOF thermal spray process to stainless steel 316L substrates. Immersion tests were conducted in baths of different compositions, namely GI (Zn-0.3 wt.% Al) and ZMA (Zn-1.5 wt.% Al-1.5 wt.% Mg). Material characterisation after testing showed evidence of coating degradation after 1 week, as the coating tended to crack and detach from the substrate, allowing the molten Zn to attack the underlying steel. The coefficient of thermal expansion of Al2O3 and steel was measured, and a difference of 13 × 10−6 K−1 was found, leading to the development of cracks in the coatings. Zn penetration through cracks was determined to be the main failure mechanism of the Al2O3 coatings, which otherwise remained inert to Zn-Al. Conversely, the coatings immersed in Zn-Al-Mg reacted with the Mg in the molten metal bath, showing that changing bath composition affected the performance of the coatings in molten Zn alloy. Journal Article Coatings 14 5 606 MDPI AG 2079-6412 ceramics; corrosion; thermal expansion; continuous galvanising; pot hardware; pot roll journal bearings 11 5 2024 2024-05-11 10.3390/coatings14050606 http://dx.doi.org/10.3390/coatings14050606 Data Availability Statement: Data are contained within the article. COLLEGE NANME COLLEGE CODE Swansea University External research funder(s) paid the OA fee (includes OA grants disbursed by the Library) This project was supported by the Engineering and Physical Sciences Research Council (Grant Ref: EP/V519601/1) with Tata Steel. 2024-05-17T11:40:24.7309550 2024-05-17T11:31:41.7955864 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Giovanni Alparone 1 David Penney 0000-0002-8942-8067 2 James Sullivan 0000-0003-1018-773X 3 James Edy 4 Christopher Mills 0000-0002-2906-4978 5 66461__30392__06778571c1c7489c80339b8f214522f7.pdf 66461.VOR.pdf 2024-05-17T11:37:05.2389070 Output 18539542 application/pdf Version of Record true © 2024 by the authors. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license. true eng https://creativecommons.org/licenses/by/4.0/
title Al2O3 Coatings for Protection of Stainless Steel 316L against Corrosion in Zn-Al and Zn-Al-Mg
spellingShingle Al2O3 Coatings for Protection of Stainless Steel 316L against Corrosion in Zn-Al and Zn-Al-Mg
Giovanni Alparone
David Penney
James Sullivan
title_short Al2O3 Coatings for Protection of Stainless Steel 316L against Corrosion in Zn-Al and Zn-Al-Mg
title_full Al2O3 Coatings for Protection of Stainless Steel 316L against Corrosion in Zn-Al and Zn-Al-Mg
title_fullStr Al2O3 Coatings for Protection of Stainless Steel 316L against Corrosion in Zn-Al and Zn-Al-Mg
title_full_unstemmed Al2O3 Coatings for Protection of Stainless Steel 316L against Corrosion in Zn-Al and Zn-Al-Mg
title_sort Al2O3 Coatings for Protection of Stainless Steel 316L against Corrosion in Zn-Al and Zn-Al-Mg
author_id_str_mv cb6fbac581782d40bece69ca22ce041a
869becc35438853f2bca0044df467631
40e32d66748ab74184a31207ab145708
author_id_fullname_str_mv cb6fbac581782d40bece69ca22ce041a_***_Giovanni Alparone
869becc35438853f2bca0044df467631_***_David Penney
40e32d66748ab74184a31207ab145708_***_James Sullivan
author Giovanni Alparone
David Penney
James Sullivan
author2 Giovanni Alparone
David Penney
James Sullivan
James Edy
Christopher Mills
format Journal article
container_title Coatings
container_volume 14
container_issue 5
container_start_page 606
publishDate 2024
institution Swansea University
issn 2079-6412
doi_str_mv 10.3390/coatings14050606
publisher MDPI AG
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/10.3390/coatings14050606
document_store_str 1
active_str 0
description The production and quality of automotive-grade galvanised steel are affected by the limited service life of the pot roll bearings used in continuous galvanising lines. The journal bearings are subjected to severe degradation as they react with the molten Zn bath, and coatings can provide corrosion protection to the bearing materials. This research investigates the performance of Al2O3 coatings applied via the HVOF thermal spray process to stainless steel 316L substrates. Immersion tests were conducted in baths of different compositions, namely GI (Zn-0.3 wt.% Al) and ZMA (Zn-1.5 wt.% Al-1.5 wt.% Mg). Material characterisation after testing showed evidence of coating degradation after 1 week, as the coating tended to crack and detach from the substrate, allowing the molten Zn to attack the underlying steel. The coefficient of thermal expansion of Al2O3 and steel was measured, and a difference of 13 × 10−6 K−1 was found, leading to the development of cracks in the coatings. Zn penetration through cracks was determined to be the main failure mechanism of the Al2O3 coatings, which otherwise remained inert to Zn-Al. Conversely, the coatings immersed in Zn-Al-Mg reacted with the Mg in the molten metal bath, showing that changing bath composition affected the performance of the coatings in molten Zn alloy.
published_date 2024-05-11T14:33:26Z
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