Mechanistic investigation on the influence of coating weights on the corrosion behaviour of hot-dip-galvanised Zn-Mg-Al coatings

Malla, Amar; Sullivan, James; Penney, David; Goldsworthy, M.; Britton, D.; Williams, Geraint; Goodwin, F.; Cardoso, A. P.

doi:10.1038/s41529-024-00494-2

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Mechanistic investigation on the influence of coating weights on the corrosion behaviour of hot-dip-galvanised Zn-Mg-Al coatings

Amar Malla

, James Sullivan

, David Penney

, M. Goldsworthy, D. Britton

, Geraint Williams

, F. Goodwin

, A. P. Cardoso

npj Materials Degradation, Volume: 8, Issue: 1

Swansea University Authors: Amar Malla , James Sullivan , David Penney , Geraint Williams

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DOI (Published version): 10.1038/s41529-024-00494-2

Abstract

Time-lapse Microscopy, scanning vibrating electrode technique and potentiodynamic methods were used to study the influence of increasing coating weight (80–310 gm–2) on microstructure, cut-edge and surface corrosion of Zn-Mg-Al coatings in 0.17 M NaCl. Cut-edge corrosion was similar for all coatings...

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Published in:	npj Materials Degradation
ISSN:	2397-2106
Published:	Springer Science and Business Media LLC 2024
Online Access:	Check full text
URI:	https://cronfa.swan.ac.uk/Record/cronfa67467
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first_indexed	2024-08-27T12:01:34Z
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Cut-edge corrosion was similar for all coatings due to the oxygen reduction reaction becoming diffusion-limited. A 64% reduction in surface corrosion was observed for high coating weights through increases in eutectic volume fraction. Spatial and temporal corrosion mechanisms were controlled by microstructural morphological differences as coating weight varied. 80 g.m–2 coatings demonstrated lateral anodic spreading potentially reducing coating penetration rates despite their higher surface corrosion rate.</abstract><type>Journal Article</type><journal>npj Materials Degradation</journal><volume>8</volume><journalNumber>1</journalNumber><paginationStart/><paginationEnd/><publisher>Springer Science and Business Media LLC</publisher><placeOfPublication/><isbnPrint/><isbnElectronic/><issnPrint/><issnElectronic>2397-2106</issnElectronic><keywords/><publishedDay>29</publishedDay><publishedMonth>7</publishedMonth><publishedYear>2024</publishedYear><publishedDate>2024-07-29</publishedDate><doi>10.1038/s41529-024-00494-2</doi><url/><notes/><college>COLLEGE NANME</college><department>Engineering and Applied Sciences School</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>EAAS</DepartmentCode><institution>Swansea University</institution><apcterm>Other</apcterm><funders>We would like to thank the Galvanized Autobody Partnership programme for funding and its associated members for their valuable input. 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spelling	v2 67467 2024-08-27 Mechanistic investigation on the influence of coating weights on the corrosion behaviour of hot-dip-galvanised Zn-Mg-Al coatings 51d0d611e98814e99679d9bb21836e3d 0000-0002-9133-7615 Amar Malla Amar Malla true false 40e32d66748ab74184a31207ab145708 0000-0003-1018-773X James Sullivan James Sullivan true false 869becc35438853f2bca0044df467631 0000-0002-8942-8067 David Penney David Penney true false 0d8fc8d44e2a3c88ce61832f66f20d82 0000-0002-3399-5142 Geraint Williams Geraint Williams true false 2024-08-27 EAAS Time-lapse Microscopy, scanning vibrating electrode technique and potentiodynamic methods were used to study the influence of increasing coating weight (80–310 gm–2) on microstructure, cut-edge and surface corrosion of Zn-Mg-Al coatings in 0.17 M NaCl. Cut-edge corrosion was similar for all coatings due to the oxygen reduction reaction becoming diffusion-limited. A 64% reduction in surface corrosion was observed for high coating weights through increases in eutectic volume fraction. Spatial and temporal corrosion mechanisms were controlled by microstructural morphological differences as coating weight varied. 80 g.m–2 coatings demonstrated lateral anodic spreading potentially reducing coating penetration rates despite their higher surface corrosion rate. Journal Article npj Materials Degradation 8 1 Springer Science and Business Media LLC 2397-2106 29 7 2024 2024-07-29 10.1038/s41529-024-00494-2 COLLEGE NANME Engineering and Applied Sciences School COLLEGE CODE EAAS Swansea University Other We would like to thank the Galvanized Autobody Partnership programme for funding and its associated members for their valuable input. The authors would also like to thank Tata Steel UK for providing samples. 2024-09-19T15:32:16.8059792 2024-08-27T13:00:45.7707963 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Amar Malla 0000-0002-9133-7615 1 James Sullivan 0000-0003-1018-773X 2 David Penney 0000-0002-8942-8067 3 M. Goldsworthy 4 D. Britton 0000-0003-2348-3546 5 Geraint Williams 0000-0002-3399-5142 6 F. Goodwin 0000-0002-5942-0195 7 A. P. Cardoso 0009-0002-2687-4067 8 67467__31399__6df5324e08834e13a7741318fcaff0f8.pdf 67467.VoR.pdf 2024-09-19T15:19:25.0269740 Output 3075913 application/pdf Version of Record true © The Author(s) 2024. This article is licensed under a Creative Commons Attribution 4.0 International License. true eng http://creativecommons.org/licenses/by/4.0/
title	Mechanistic investigation on the influence of coating weights on the corrosion behaviour of hot-dip-galvanised Zn-Mg-Al coatings
spellingShingle	Mechanistic investigation on the influence of coating weights on the corrosion behaviour of hot-dip-galvanised Zn-Mg-Al coatings Amar Malla James Sullivan David Penney Geraint Williams
title_short	Mechanistic investigation on the influence of coating weights on the corrosion behaviour of hot-dip-galvanised Zn-Mg-Al coatings
title_full	Mechanistic investigation on the influence of coating weights on the corrosion behaviour of hot-dip-galvanised Zn-Mg-Al coatings
title_fullStr	Mechanistic investigation on the influence of coating weights on the corrosion behaviour of hot-dip-galvanised Zn-Mg-Al coatings
title_full_unstemmed	Mechanistic investigation on the influence of coating weights on the corrosion behaviour of hot-dip-galvanised Zn-Mg-Al coatings
title_sort	Mechanistic investigation on the influence of coating weights on the corrosion behaviour of hot-dip-galvanised Zn-Mg-Al coatings
author_id_str_mv	51d0d611e98814e99679d9bb21836e3d 40e32d66748ab74184a31207ab145708 869becc35438853f2bca0044df467631 0d8fc8d44e2a3c88ce61832f66f20d82
author_id_fullname_str_mv	51d0d611e98814e99679d9bb21836e3d_*_Amar Malla 40e32d66748ab74184a31207ab145708__James Sullivan 869becc35438853f2bca0044df467631__David Penney 0d8fc8d44e2a3c88ce61832f66f20d82_*_Geraint Williams
author	Amar Malla James Sullivan David Penney Geraint Williams
author2	Amar Malla James Sullivan David Penney M. Goldsworthy D. Britton Geraint Williams F. Goodwin A. P. Cardoso
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description	Time-lapse Microscopy, scanning vibrating electrode technique and potentiodynamic methods were used to study the influence of increasing coating weight (80–310 gm–2) on microstructure, cut-edge and surface corrosion of Zn-Mg-Al coatings in 0.17 M NaCl. Cut-edge corrosion was similar for all coatings due to the oxygen reduction reaction becoming diffusion-limited. A 64% reduction in surface corrosion was observed for high coating weights through increases in eutectic volume fraction. Spatial and temporal corrosion mechanisms were controlled by microstructural morphological differences as coating weight varied. 80 g.m–2 coatings demonstrated lateral anodic spreading potentially reducing coating penetration rates despite their higher surface corrosion rate.
published_date	2024-07-29T15:32:16Z
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Mechanistic investigation on the influence of coating weights on the corrosion behaviour of hot-dip-galvanised Zn-Mg-Al coatings

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