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The Effect of Microstructural Refinement on the Localized Corrosion of Model Zn-Al-Mg Alloy Coatings on Steel
Journal of The Electrochemical Society, Volume: 166, Issue: 11, Pages: C3147 - C3158
Swansea University Authors: Natalie Wint, James Sullivan , Geraint Williams , Nathan Cooze , Justin Searle , 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...
Published in: | Journal of The Electrochemical Society |
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ISSN: | 0013-4651 1945-7111 |
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The Electrochemical Society
2019
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URI: | https://cronfa.swan.ac.uk/Record/cronfa49978 |
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<?xml version="1.0"?><rfc1807><datestamp>2021-09-14T12:47:29.4897295</datestamp><bib-version>v2</bib-version><id>49978</id><entry>2019-04-12</entry><title>The Effect of Microstructural Refinement on the Localized Corrosion of Model Zn-Al-Mg Alloy Coatings on Steel</title><swanseaauthors><author><sid>5be5dcc4b97c78b3063e258add4fff5c</sid><firstname>Natalie</firstname><surname>Wint</surname><name>Natalie Wint</name><active>true</active><ethesisStudent>false</ethesisStudent></author><author><sid>40e32d66748ab74184a31207ab145708</sid><ORCID>0000-0003-1018-773X</ORCID><firstname>James</firstname><surname>Sullivan</surname><name>James Sullivan</name><active>true</active><ethesisStudent>false</ethesisStudent></author><author><sid>0d8fc8d44e2a3c88ce61832f66f20d82</sid><ORCID>0000-0002-3399-5142</ORCID><firstname>Geraint</firstname><surname>Williams</surname><name>Geraint Williams</name><active>true</active><ethesisStudent>false</ethesisStudent></author><author><sid>0a64e9ea4739faddc8e873f0eee803bc</sid><ORCID>0000-0002-7870-9699</ORCID><firstname>Nathan</firstname><surname>Cooze</surname><name>Nathan Cooze</name><active>true</active><ethesisStudent>false</ethesisStudent></author><author><sid>0e3f2c3812f181eaed11c45554d4cdd0</sid><ORCID>0000-0003-1101-075X</ORCID><firstname>Justin</firstname><surname>Searle</surname><name>Justin Searle</name><active>true</active><ethesisStudent>false</ethesisStudent></author><author><sid>56fc1b17ffc3bdf6039dc05c6eba7f2a</sid><firstname>Hamilton</firstname><surname>McMurray</surname><name>Hamilton McMurray</name><active>true</active><ethesisStudent>false</ethesisStudent></author></swanseaauthors><date>2019-04-12</date><deptcode>FGSEN</deptcode><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 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>The Electrochemical Society</publisher><placeOfPublication/><isbnPrint/><isbnElectronic/><issnPrint>0013-4651</issnPrint><issnElectronic>1945-7111</issnElectronic><keywords/><publishedDay>25</publishedDay><publishedMonth>4</publishedMonth><publishedYear>2019</publishedYear><publishedDate>2019-04-25</publishedDate><doi>10.1149/2.0171911jes</doi><url/><notes/><college>COLLEGE NANME</college><department>Science and Engineering - Faculty</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>FGSEN</DepartmentCode><institution>Swansea University</institution><apcterm/><lastEdited>2021-09-14T12:47:29.4897295</lastEdited><Created>2019-04-12T13:59:47.6827826</Created><path><level id="1">Faculty of Science and Engineering</level><level id="2">School of Engineering and Applied Sciences - Materials Science and Engineering</level></path><authors><author><firstname>Natalie</firstname><surname>Wint</surname><order>1</order></author><author><firstname>N.</firstname><surname>Cooze</surname><order>2</order></author><author><firstname>J. 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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 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 FGSEN 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 Science and Engineering - Faculty COLLEGE CODE FGSEN 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 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 0d8fc8d44e2a3c88ce61832f66f20d82 0a64e9ea4739faddc8e873f0eee803bc 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 |
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facultyofscienceandengineering |
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Faculty of Science and Engineering |
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facultyofscienceandengineering |
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Faculty of Science and Engineering |
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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 |
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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 |
2019-04-25T04:01:16Z |
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1763753146490814464 |
score |
10.99342 |