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The Effect of Microstructural Refinement on the Localized Corrosion of Model Zn-Al-Mg Alloy Coatings on Steel / Natalie, Wint; Nathan, Cooze; Justin, Searle; Geraint, Williams; Hamilton, McMurray; James, Sullivan

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

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

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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: 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°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.</abstract><type>Journal Article</type><journal>Journal of The Electrochemical Society</journal><volume>166</volume><journalNumber>11</journalNumber><paginationStart>C3147</paginationStart><paginationEnd>C3158</paginationEnd><publisher/><issnPrint>0013-4651</issnPrint><issnElectronic>1945-7111</issnElectronic><keywords/><publishedDay>31</publishedDay><publishedMonth>12</publishedMonth><publishedYear>2019</publishedYear><publishedDate>2019-12-31</publishedDate><doi>10.1149/2.0171911jes</doi><url/><notes/><college>COLLEGE NANME</college><department>Engineering</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>EEN</DepartmentCode><institution>Swansea University</institution><lastEdited>2020-08-06T17:07:58.6759485</lastEdited><Created>2019-04-12T13:59:47.6827826</Created><path><level id="1">College of Engineering</level><level id="2">Engineering</level></path><authors><author><firstname>Natalie</firstname><surname>Wint</surname><orcid>0000-0002-9229-5728</orcid><order>1</order></author><author><firstname>Nathan</firstname><surname>Cooze</surname><order>2</order></author><author><firstname>Justin</firstname><surname>Searle</surname><orcid>0000-0003-1101-075X</orcid><order>3</order></author><author><firstname>J. 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spelling 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 0a64e9ea4739faddc8e873f0eee803bc Nathan Cooze Nathan Cooze true false 0e3f2c3812f181eaed11c45554d4cdd0 0000-0003-1101-075X Justin Searle Justin Searle true false 0d8fc8d44e2a3c88ce61832f66f20d82 0000-0002-3399-5142 Geraint Williams Geraint Williams true false 56fc1b17ffc3bdf6039dc05c6eba7f2a 0000-0001-9922-9929 Hamilton McMurray Hamilton McMurray true false 40e32d66748ab74184a31207ab145708 0000-0003-1018-773X James Sullivan James Sullivan true false 2019-04-12 EEN 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 0013-4651 1945-7111 31 12 2019 2019-12-31 10.1149/2.0171911jes COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2020-08-06T17:07:58.6759485 2019-04-12T13:59:47.6827826 College of Engineering Engineering Natalie Wint 0000-0002-9229-5728 1 Nathan Cooze 2 Justin Searle 0000-0003-1101-075X 3 J. H. Sullivan 4 Geraint Williams 0000-0002-3399-5142 5 Hamilton McMurray 0000-0001-9922-9929 6 G. Luckeneder 7 C. Riener 8 James Sullivan 0000-0003-1018-773X 9 0049978-13052019142805.pdf wint2019(3)v2.pdf 2019-05-13T14:28:05.0930000 Output 7111898 application/pdf Version of Record true 2019-05-13T00:00:00.0000000 Distributed under the terms of a Creative Commons Attribution (CC-BY-4.0) true eng
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
Nathan, Cooze
Justin, Searle
Geraint, Williams
Hamilton, McMurray
James, Sullivan
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
0a64e9ea4739faddc8e873f0eee803bc
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author_id_fullname_str_mv 5be5dcc4b97c78b3063e258add4fff5c_***_Natalie, Wint
0a64e9ea4739faddc8e873f0eee803bc_***_Nathan, Cooze
0e3f2c3812f181eaed11c45554d4cdd0_***_Justin, Searle
0d8fc8d44e2a3c88ce61832f66f20d82_***_Geraint, Williams
56fc1b17ffc3bdf6039dc05c6eba7f2a_***_Hamilton, McMurray
40e32d66748ab74184a31207ab145708_***_James, Sullivan
author Natalie, Wint
Nathan, Cooze
Justin, Searle
Geraint, Williams
Hamilton, McMurray
James, Sullivan
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institution Swansea University
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1945-7111
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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 2019-12-31T17:07:54Z
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