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The effect of ultrasonic irradiation on the microstructure and corrosion rate of a Zn–4.8wt.% Al galvanising alloy used in high performance construction coatings

James Sullivan Orcid Logo, David Penney Orcid Logo, Jonathan Elvins, Khalil Khan

Surface and Coatings Technology, Volume: 306, Pages: 480 - 489

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

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DOI (Published version): 10.1016/j.surfcoat.2016.01.050

Abstract

The microstructure and corrosion resistance of a Zn–4.8 wt.% Al alloy, typically used for high performance galvanised coatings for construction, was modified by the application of ultrasound during solidification. The alloy exposed to ultrasound had an increased volume fraction of smaller, discrete...

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Published in: Surface and Coatings Technology
ISSN: 0257-8972
Published: 2016
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa26013
first_indexed 2016-01-29T01:56:43Z
last_indexed 2020-08-14T02:46:08Z
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spelling 2020-08-13T11:29:25.1363495 v2 26013 2016-01-28 The effect of ultrasonic irradiation on the microstructure and corrosion rate of a Zn–4.8wt.% Al galvanising alloy used in high performance construction coatings 40e32d66748ab74184a31207ab145708 0000-0003-1018-773X James Sullivan James Sullivan true false 869becc35438853f2bca0044df467631 0000-0002-8942-8067 David Penney David Penney true false 2016-01-28 EAAS The microstructure and corrosion resistance of a Zn–4.8 wt.% Al alloy, typically used for high performance galvanised coatings for construction, was modified by the application of ultrasound during solidification. The alloy exposed to ultrasound had an increased volume fraction of smaller, discrete primary η Zn phase regions that were more uniformly distributed throughout the casting. The morphology of η Zn was altered from dendritic to globular and the Zn/Al eutectic growth was disrupted in localised areas from lamellar to anomalous. These changes were likely due to the physical action of the ultrasound disrupting compositional effects, fragmenting dendrites and through the development of cavitation events causing disruptive mixing. These microstructural changes produced an enhanced cut-edge corrosion resistance of the alloy in 0.1% NaCl when coupled with steel mimicking in service coating conditions that was investigated using the SVET. The primary η Zn crystal regions were focussed sites for anodic Zn dissolution and the smaller η regions produced by ultrasound reduced the corrosion rate by preventing the development of crevice like phenomena that may be associated with larger dendrites. The number and size of primary η Zn regions affected the corrosion rate with reductions in these factors reducing the corrosion rate of the alloy. Journal Article Surface and Coatings Technology 306 480 489 0257-8972 Galvanising; Ultrasound; Zn–Al; Microstructure; Corrosion 25 11 2016 2016-11-25 10.1016/j.surfcoat.2016.01.050 COLLEGE NANME Engineering and Applied Sciences School COLLEGE CODE EAAS Swansea University 2020-08-13T11:29:25.1363495 2016-01-28T09:29:20.2051412 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering James Sullivan 0000-0003-1018-773X 1 David Penney 0000-0002-8942-8067 2 Jonathan Elvins 3 Khalil Khan 4 0026013-28012016093148.pdf AcceptedManuscriptUltrasoundonGalvalloy.pdf 2016-01-28T09:31:48.9670000 Output 1086329 application/pdf Accepted Manuscript true 2017-01-26T00:00:00.0000000 true
title The effect of ultrasonic irradiation on the microstructure and corrosion rate of a Zn–4.8wt.% Al galvanising alloy used in high performance construction coatings
spellingShingle The effect of ultrasonic irradiation on the microstructure and corrosion rate of a Zn–4.8wt.% Al galvanising alloy used in high performance construction coatings
James Sullivan
David Penney
title_short The effect of ultrasonic irradiation on the microstructure and corrosion rate of a Zn–4.8wt.% Al galvanising alloy used in high performance construction coatings
title_full The effect of ultrasonic irradiation on the microstructure and corrosion rate of a Zn–4.8wt.% Al galvanising alloy used in high performance construction coatings
title_fullStr The effect of ultrasonic irradiation on the microstructure and corrosion rate of a Zn–4.8wt.% Al galvanising alloy used in high performance construction coatings
title_full_unstemmed The effect of ultrasonic irradiation on the microstructure and corrosion rate of a Zn–4.8wt.% Al galvanising alloy used in high performance construction coatings
title_sort The effect of ultrasonic irradiation on the microstructure and corrosion rate of a Zn–4.8wt.% Al galvanising alloy used in high performance construction coatings
author_id_str_mv 40e32d66748ab74184a31207ab145708
869becc35438853f2bca0044df467631
author_id_fullname_str_mv 40e32d66748ab74184a31207ab145708_***_James Sullivan
869becc35438853f2bca0044df467631_***_David Penney
author James Sullivan
David Penney
author2 James Sullivan
David Penney
Jonathan Elvins
Khalil Khan
format Journal article
container_title Surface and Coatings Technology
container_volume 306
container_start_page 480
publishDate 2016
institution Swansea University
issn 0257-8972
doi_str_mv 10.1016/j.surfcoat.2016.01.050
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
active_str 0
description The microstructure and corrosion resistance of a Zn–4.8 wt.% Al alloy, typically used for high performance galvanised coatings for construction, was modified by the application of ultrasound during solidification. The alloy exposed to ultrasound had an increased volume fraction of smaller, discrete primary η Zn phase regions that were more uniformly distributed throughout the casting. The morphology of η Zn was altered from dendritic to globular and the Zn/Al eutectic growth was disrupted in localised areas from lamellar to anomalous. These changes were likely due to the physical action of the ultrasound disrupting compositional effects, fragmenting dendrites and through the development of cavitation events causing disruptive mixing. These microstructural changes produced an enhanced cut-edge corrosion resistance of the alloy in 0.1% NaCl when coupled with steel mimicking in service coating conditions that was investigated using the SVET. The primary η Zn crystal regions were focussed sites for anodic Zn dissolution and the smaller η regions produced by ultrasound reduced the corrosion rate by preventing the development of crevice like phenomena that may be associated with larger dendrites. The number and size of primary η Zn regions affected the corrosion rate with reductions in these factors reducing the corrosion rate of the alloy.
published_date 2016-11-25T12:53:20Z
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score 11.132912

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