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The Effect of Microstructural Refinement on the Localized Corrosion of Model Zn-Al-Mg Alloy Coatings on Steel

Natalie Wint Orcid Logo, N. Cooze, J. R. Searle, James Sullivan Orcid Logo, Geraint Williams Orcid Logo, H. N. McMurray, G. Luckeneder, C. Riener, Nathan Cooze Orcid Logo, Justin Searle Orcid Logo, Hamilton McMurray

Journal of The Electrochemical Society, Volume: 166, Issue: 11, Pages: C3147 - C3158

Swansea University Authors: Natalie Wint Orcid Logo, James Sullivan Orcid Logo, Geraint Williams Orcid Logo, Nathan Cooze Orcid Logo, Justin Searle Orcid Logo, Hamilton McMurray

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DOI (Published version): 10.1149/2.0171911jes

Abstract

A combination of in-situ Scanning Vibrating Electrode Technique (SVET) and time-lapse immersion optical microscopy (TLM) is used to investigate the effect of microstructural refinement on patterns of localized corrosion affecting zinc-aluminum-magnesium (ZAM) galvanized coatings on steel. Model ZAM...

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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/cronfa49978
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Model ZAM coatings comprising Zn-2.7 wt% Al-1.5 wt% Mg are produced on 0.7 mm mild steel sheet by hot dipping, and the resulting coating microstructure is systematically refined by increasing the cooling (solidification) rate from 5&#xB0;C.sec&#x2212;1 to 1000&#xB0;C.sec&#x2212;1. The intact ZAM coated surface is immersed in 0.17 M aqueous NaCl, and SVET and TLM are used to follow the resulting localized corrosive attack. TLM shows that corrosion initiates preferentially within MgZn2 and spreads laterally over the ZAM surface by preferentially following MgZn2 rich phases. In coarse microstructures, large primary zinc grains tend to deflect and constrain lateral spreading whereas in fine microstructures the smaller primary zinc grains do not. Consequently, lateral spreading rate increases with microstructural refinement. SVET shows that global corrosion rates are similar for all the ZAM coatings but that increased lateral spreading results in lower rates of through-coating penetration for the refined microstructures. 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spelling 2021-09-14T12:47:29.4897295 v2 49978 2019-04-12 The Effect of Microstructural Refinement on the Localized Corrosion of Model Zn-Al-Mg Alloy Coatings on Steel 5be5dcc4b97c78b3063e258add4fff5c 0000-0002-9229-5728 Natalie Wint Natalie Wint true false 40e32d66748ab74184a31207ab145708 0000-0003-1018-773X James Sullivan James Sullivan true false 0d8fc8d44e2a3c88ce61832f66f20d82 0000-0002-3399-5142 Geraint Williams Geraint Williams true false 0a64e9ea4739faddc8e873f0eee803bc 0000-0002-7870-9699 Nathan Cooze Nathan Cooze true false 0e3f2c3812f181eaed11c45554d4cdd0 0000-0003-1101-075X Justin Searle Justin Searle true false 56fc1b17ffc3bdf6039dc05c6eba7f2a Hamilton McMurray Hamilton McMurray true false 2019-04-12 GENG A combination of in-situ Scanning Vibrating Electrode Technique (SVET) and time-lapse immersion optical microscopy (TLM) is used to investigate the effect of microstructural refinement on patterns of localized corrosion affecting zinc-aluminum-magnesium (ZAM) galvanized coatings on steel. Model ZAM coatings comprising Zn-2.7 wt% Al-1.5 wt% Mg are produced on 0.7 mm mild steel sheet by hot dipping, and the resulting coating microstructure is systematically refined by increasing the cooling (solidification) rate from 5°C.sec−1 to 1000°C.sec−1. The intact ZAM coated surface is immersed in 0.17 M aqueous NaCl, and SVET and TLM are used to follow the resulting localized corrosive attack. TLM shows that corrosion initiates preferentially within MgZn2 and spreads laterally over the ZAM surface by preferentially following MgZn2 rich phases. In coarse microstructures, large primary zinc grains tend to deflect and constrain lateral spreading whereas in fine microstructures the smaller primary zinc grains do not. Consequently, lateral spreading rate increases with microstructural refinement. SVET shows that global corrosion rates are similar for all the ZAM coatings but that increased lateral spreading results in lower rates of through-coating penetration for the refined microstructures. These findings are explained in terms of the lateral diffusion of aggressive anolyte species. Journal Article Journal of The Electrochemical Society 166 11 C3147 C3158 The Electrochemical Society 0013-4651 1945-7111 25 4 2019 2019-04-25 10.1149/2.0171911jes COLLEGE NANME General Engineering COLLEGE CODE GENG Swansea University 2021-09-14T12:47:29.4897295 2019-04-12T13:59:47.6827826 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Natalie Wint 0000-0002-9229-5728 1 N. Cooze 2 J. R. Searle 3 James Sullivan 0000-0003-1018-773X 4 Geraint Williams 0000-0002-3399-5142 5 H. N. McMurray 6 G. Luckeneder 7 C. Riener 8 Nathan Cooze 0000-0002-7870-9699 9 Justin Searle 0000-0003-1101-075X 10 Hamilton McMurray 11 0049978-13052019142805.pdf wint2019(3)v2.pdf 2019-05-13T14:28:05.0930000 Output 7111898 application/pdf Version of Record true © 2019 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 4.0 (CC BY) License true eng http://creativecommons.org/licenses/by/4.0/
title The Effect of Microstructural Refinement on the Localized Corrosion of Model Zn-Al-Mg Alloy Coatings on Steel
spellingShingle The Effect of Microstructural Refinement on the Localized Corrosion of Model Zn-Al-Mg Alloy Coatings on Steel
Natalie Wint
James Sullivan
Geraint Williams
Nathan Cooze
Justin Searle
Hamilton McMurray
title_short The Effect of Microstructural Refinement on the Localized Corrosion of Model Zn-Al-Mg Alloy Coatings on Steel
title_full The Effect of Microstructural Refinement on the Localized Corrosion of Model Zn-Al-Mg Alloy Coatings on Steel
title_fullStr The Effect of Microstructural Refinement on the Localized Corrosion of Model Zn-Al-Mg Alloy Coatings on Steel
title_full_unstemmed The Effect of Microstructural Refinement on the Localized Corrosion of Model Zn-Al-Mg Alloy Coatings on Steel
title_sort The Effect of Microstructural Refinement on the Localized Corrosion of Model Zn-Al-Mg Alloy Coatings on Steel
author_id_str_mv 5be5dcc4b97c78b3063e258add4fff5c
40e32d66748ab74184a31207ab145708
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0e3f2c3812f181eaed11c45554d4cdd0
56fc1b17ffc3bdf6039dc05c6eba7f2a
author_id_fullname_str_mv 5be5dcc4b97c78b3063e258add4fff5c_***_Natalie Wint
40e32d66748ab74184a31207ab145708_***_James Sullivan
0d8fc8d44e2a3c88ce61832f66f20d82_***_Geraint Williams
0a64e9ea4739faddc8e873f0eee803bc_***_Nathan Cooze
0e3f2c3812f181eaed11c45554d4cdd0_***_Justin Searle
56fc1b17ffc3bdf6039dc05c6eba7f2a_***_Hamilton McMurray
author Natalie Wint
James Sullivan
Geraint Williams
Nathan Cooze
Justin Searle
Hamilton McMurray
author2 Natalie Wint
N. Cooze
J. R. Searle
James Sullivan
Geraint Williams
H. N. McMurray
G. Luckeneder
C. Riener
Nathan Cooze
Justin Searle
Hamilton McMurray
format Journal article
container_title Journal of The Electrochemical Society
container_volume 166
container_issue 11
container_start_page C3147
publishDate 2019
institution Swansea University
issn 0013-4651
1945-7111
doi_str_mv 10.1149/2.0171911jes
publisher The Electrochemical Society
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
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description A combination of in-situ Scanning Vibrating Electrode Technique (SVET) and time-lapse immersion optical microscopy (TLM) is used to investigate the effect of microstructural refinement on patterns of localized corrosion affecting zinc-aluminum-magnesium (ZAM) galvanized coatings on steel. Model ZAM coatings comprising Zn-2.7 wt% Al-1.5 wt% Mg are produced on 0.7 mm mild steel sheet by hot dipping, and the resulting coating microstructure is systematically refined by increasing the cooling (solidification) rate from 5°C.sec−1 to 1000°C.sec−1. The intact ZAM coated surface is immersed in 0.17 M aqueous NaCl, and SVET and TLM are used to follow the resulting localized corrosive attack. TLM shows that corrosion initiates preferentially within MgZn2 and spreads laterally over the ZAM surface by preferentially following MgZn2 rich phases. In coarse microstructures, large primary zinc grains tend to deflect and constrain lateral spreading whereas in fine microstructures the smaller primary zinc grains do not. Consequently, lateral spreading rate increases with microstructural refinement. SVET shows that global corrosion rates are similar for all the ZAM coatings but that increased lateral spreading results in lower rates of through-coating penetration for the refined microstructures. These findings are explained in terms of the lateral diffusion of aggressive anolyte species.
published_date 2019-04-25T03:58:48Z
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