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An investigation into the atmospheric corrosion of brass using sodium chloride-containing water droplets

Alex Nielsen, Geraint Williams, Nathan Cooze Orcid Logo, Patrick Dodds, Phillip Ansell, Eliott Strutt

Corrosion & Prevention 2019, Volume: Paper No. 66

Swansea University Author: Nathan Cooze Orcid Logo

Abstract

Imitating gold at a fraction of the cost is an attribute of brass that has driven watchmakers and minters to utilise this alloy, providing their products with desirable aesthetics while being commercially feasible. Unfortunately, tarnishing under atmospheric conditions reveals the imitator all too s...

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Published in: Corrosion & Prevention 2019
Published: Australasian Corrosion Association Conference 2017
Online Access: https://conference.corrosion.com.au/65-novel-smart-release-chrome-free-inhibiting-pigments-from-lab-investigation-to-industrial-coatings/
URI: https://cronfa.swan.ac.uk/Record/cronfa49135
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fullrecord <?xml version="1.0"?><rfc1807><datestamp>2019-03-07T14:01:15.8456612</datestamp><bib-version>v2</bib-version><id>49135</id><entry>2019-03-06</entry><title>An investigation into the atmospheric corrosion of brass using sodium chloride-containing water droplets</title><swanseaauthors><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></swanseaauthors><date>2019-03-06</date><deptcode>MTLS</deptcode><abstract>Imitating gold at a fraction of the cost is an attribute of brass that has driven watchmakers and minters to utilise this alloy, providing their products with desirable aesthetics while being commercially feasible. Unfortunately, tarnishing under atmospheric conditions reveals the imitator all too soon. This study aims to simulate and measure a fundamental corrosion mechanism on brass.As a NaCl water droplet becomes deficient in oxygen, a differential aeration cell is established whereby cathodic oxygen reduction becomes preferable at the droplet circumference. This region draws sodium cations to counteract the electronegativity associated with an accumulation of hydroxide anions producing a secondary spreading phenomenon &#x2013; originating at the droplet perimeter and proceeding radially outside its boundaries.A combination of time-lapse photography and height-regulated scanning kelvin probe (SKP) potentiometry is used to study cathodic secondary spreading phenomenon, following exposure to NaCl containing water droplets. The rates at which these highly alkaline electrolytic films proceed from the droplet edge are measured and are shown to follow parabolic kinetics. NaCl droplet concentrations ranging 0.1 &#x2013; 5 mol/dm3 exhibit significant rates of secondary spreading as shown using time-dependent Ecorr vs distance plots, though visual analysis was inadequate in measuring similar rates at lower NaCl concentrations. Cl&#x2013; sequestering corrosion product under the droplet coupled with migration of Na+ ions from the droplet bulk lower the solute concentration causing progressive evaporation under constant humidity, shown to be most extreme at lower NaCl droplet concentrations.</abstract><type>Conference Paper/Proceeding/Abstract</type><journal>Corrosion &amp; Prevention 2019</journal><volume>Paper No. 66</volume><publisher>Australasian Corrosion Association Conference</publisher><keywords/><publishedDay>31</publishedDay><publishedMonth>12</publishedMonth><publishedYear>2017</publishedYear><publishedDate>2017-12-31</publishedDate><doi/><url>https://conference.corrosion.com.au/65-novel-smart-release-chrome-free-inhibiting-pigments-from-lab-investigation-to-industrial-coatings/</url><notes/><college>COLLEGE NANME</college><department>Materials Science and Engineering</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>MTLS</DepartmentCode><institution>Swansea University</institution><apcterm/><lastEdited>2019-03-07T14:01:15.8456612</lastEdited><Created>2019-03-06T14:08:05.0852053</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>Alex</firstname><surname>Nielsen</surname><order>1</order></author><author><firstname>Geraint</firstname><surname>Williams</surname><order>2</order></author><author><firstname>Nathan</firstname><surname>Cooze</surname><orcid>0000-0002-7870-9699</orcid><order>3</order></author><author><firstname>Patrick</firstname><surname>Dodds</surname><order>4</order></author><author><firstname>Phillip</firstname><surname>Ansell</surname><order>5</order></author><author><firstname>Eliott</firstname><surname>Strutt</surname><order>6</order></author></authors><documents/><OutputDurs/></rfc1807>
spelling 2019-03-07T14:01:15.8456612 v2 49135 2019-03-06 An investigation into the atmospheric corrosion of brass using sodium chloride-containing water droplets 0a64e9ea4739faddc8e873f0eee803bc 0000-0002-7870-9699 Nathan Cooze Nathan Cooze true false 2019-03-06 MTLS Imitating gold at a fraction of the cost is an attribute of brass that has driven watchmakers and minters to utilise this alloy, providing their products with desirable aesthetics while being commercially feasible. Unfortunately, tarnishing under atmospheric conditions reveals the imitator all too soon. This study aims to simulate and measure a fundamental corrosion mechanism on brass.As a NaCl water droplet becomes deficient in oxygen, a differential aeration cell is established whereby cathodic oxygen reduction becomes preferable at the droplet circumference. This region draws sodium cations to counteract the electronegativity associated with an accumulation of hydroxide anions producing a secondary spreading phenomenon – originating at the droplet perimeter and proceeding radially outside its boundaries.A combination of time-lapse photography and height-regulated scanning kelvin probe (SKP) potentiometry is used to study cathodic secondary spreading phenomenon, following exposure to NaCl containing water droplets. The rates at which these highly alkaline electrolytic films proceed from the droplet edge are measured and are shown to follow parabolic kinetics. NaCl droplet concentrations ranging 0.1 – 5 mol/dm3 exhibit significant rates of secondary spreading as shown using time-dependent Ecorr vs distance plots, though visual analysis was inadequate in measuring similar rates at lower NaCl concentrations. Cl– sequestering corrosion product under the droplet coupled with migration of Na+ ions from the droplet bulk lower the solute concentration causing progressive evaporation under constant humidity, shown to be most extreme at lower NaCl droplet concentrations. Conference Paper/Proceeding/Abstract Corrosion & Prevention 2019 Paper No. 66 Australasian Corrosion Association Conference 31 12 2017 2017-12-31 https://conference.corrosion.com.au/65-novel-smart-release-chrome-free-inhibiting-pigments-from-lab-investigation-to-industrial-coatings/ COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2019-03-07T14:01:15.8456612 2019-03-06T14:08:05.0852053 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Alex Nielsen 1 Geraint Williams 2 Nathan Cooze 0000-0002-7870-9699 3 Patrick Dodds 4 Phillip Ansell 5 Eliott Strutt 6
title An investigation into the atmospheric corrosion of brass using sodium chloride-containing water droplets
spellingShingle An investigation into the atmospheric corrosion of brass using sodium chloride-containing water droplets
Nathan Cooze
title_short An investigation into the atmospheric corrosion of brass using sodium chloride-containing water droplets
title_full An investigation into the atmospheric corrosion of brass using sodium chloride-containing water droplets
title_fullStr An investigation into the atmospheric corrosion of brass using sodium chloride-containing water droplets
title_full_unstemmed An investigation into the atmospheric corrosion of brass using sodium chloride-containing water droplets
title_sort An investigation into the atmospheric corrosion of brass using sodium chloride-containing water droplets
author_id_str_mv 0a64e9ea4739faddc8e873f0eee803bc
author_id_fullname_str_mv 0a64e9ea4739faddc8e873f0eee803bc_***_Nathan Cooze
author Nathan Cooze
author2 Alex Nielsen
Geraint Williams
Nathan Cooze
Patrick Dodds
Phillip Ansell
Eliott Strutt
format Conference Paper/Proceeding/Abstract
container_title Corrosion & Prevention 2019
container_volume Paper No. 66
publishDate 2017
institution Swansea University
publisher Australasian Corrosion Association Conference
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
url https://conference.corrosion.com.au/65-novel-smart-release-chrome-free-inhibiting-pigments-from-lab-investigation-to-industrial-coatings/
document_store_str 0
active_str 0
description Imitating gold at a fraction of the cost is an attribute of brass that has driven watchmakers and minters to utilise this alloy, providing their products with desirable aesthetics while being commercially feasible. Unfortunately, tarnishing under atmospheric conditions reveals the imitator all too soon. This study aims to simulate and measure a fundamental corrosion mechanism on brass.As a NaCl water droplet becomes deficient in oxygen, a differential aeration cell is established whereby cathodic oxygen reduction becomes preferable at the droplet circumference. This region draws sodium cations to counteract the electronegativity associated with an accumulation of hydroxide anions producing a secondary spreading phenomenon – originating at the droplet perimeter and proceeding radially outside its boundaries.A combination of time-lapse photography and height-regulated scanning kelvin probe (SKP) potentiometry is used to study cathodic secondary spreading phenomenon, following exposure to NaCl containing water droplets. The rates at which these highly alkaline electrolytic films proceed from the droplet edge are measured and are shown to follow parabolic kinetics. NaCl droplet concentrations ranging 0.1 – 5 mol/dm3 exhibit significant rates of secondary spreading as shown using time-dependent Ecorr vs distance plots, though visual analysis was inadequate in measuring similar rates at lower NaCl concentrations. Cl– sequestering corrosion product under the droplet coupled with migration of Na+ ions from the droplet bulk lower the solute concentration causing progressive evaporation under constant humidity, shown to be most extreme at lower NaCl droplet concentrations.
published_date 2017-12-31T03:59:55Z
_version_ 1763753061492195328
score 11.016235

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