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Concentration Effects on the Spatial Interaction of Corrosion Pits Occurring on Zinc in Dilute Aqueous Sodium Chloride

Natalie Wint, Khalil Khan, James Sullivan Orcid Logo, Hamilton McMurray

Journal of The Electrochemical Society, Volume: 166, Issue: 11, Pages: C3028 - C3038

Swansea University Authors: Natalie Wint, Khalil Khan, James Sullivan Orcid Logo, Hamilton McMurray

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DOI (Published version): 10.1149/2.0051911jes

Abstract

The scanning vibrating electrode technique is used to study the localized corrosion of unpolarized zinc in near-neutral aqueous sodium chloride electrolyte of varying concentration [NaCl]. As [NaCl] is reduced from 1% (w/v) to 0.0005% (w/v) the morphology of attack changes from large, irregular, are...

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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/cronfa48421
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spelling 2021-01-15T10:26:53.8840472 v2 48421 2019-01-25 Concentration Effects on the Spatial Interaction of Corrosion Pits Occurring on Zinc in Dilute Aqueous Sodium Chloride 5be5dcc4b97c78b3063e258add4fff5c Natalie Wint Natalie Wint true false a64a2b7f7a9a913f39aab88f735b38ed Khalil Khan Khalil Khan true false 40e32d66748ab74184a31207ab145708 0000-0003-1018-773X James Sullivan James Sullivan true false 56fc1b17ffc3bdf6039dc05c6eba7f2a Hamilton McMurray Hamilton McMurray true false 2019-01-25 FGSEN The scanning vibrating electrode technique is used to study the localized corrosion of unpolarized zinc in near-neutral aqueous sodium chloride electrolyte of varying concentration [NaCl]. As [NaCl] is reduced from 1% (w/v) to 0.0005% (w/v) the morphology of attack changes from large, irregular, areas of anodic zinc dissolution and cathodic oxygen reduction, to a regular array of anodic pits set in an otherwise cathodic surface. In dilute electrolyte ([NaCl] < 0.01%) the total (area averaged) corrosion current density, J, (A·m−2), obtained from a numerical area integral of SVET anodic current density data, is shown to vary with approximately the square root of [NaCl]. The number density of pits, n (m−2) is shown to decrease with increasing [NaCl]. The mean individual pit current, ipit¯¯¯¯, (A = J/n) varies with approximately the square root of [NaCl]. A simple geometric analysis, based on a calculation of the radial dependence of electrical resistance exhibited by a hemispherical shell of electrolyte concentric with the pit, is used to explain the relationship between ohmic potential drop in the external solution, solution conductivity, and the radial distance away from an existing active pit. Journal Article Journal of The Electrochemical Society 166 11 C3028 C3038 0013-4651 1945-7111 24 1 2019 2019-01-24 10.1149/2.0051911jes COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2021-01-15T10:26:53.8840472 2019-01-25T08:39:21.5765541 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Natalie Wint 1 Khalil Khan 2 James Sullivan 0000-0003-1018-773X 3 Hamilton McMurray 4 48421__17785__0bef89367ea24b188c81e78a8d23e66d.pdf 48421.pdf 2020-07-24T14:41:05.0298274 Output 1808825 application/pdf Version of Record true Released under the terms of a Creative Commons Attribution 4.0 License (CC-BY). true eng http://creativecommons.org/licenses/by/4.0/
title Concentration Effects on the Spatial Interaction of Corrosion Pits Occurring on Zinc in Dilute Aqueous Sodium Chloride
spellingShingle Concentration Effects on the Spatial Interaction of Corrosion Pits Occurring on Zinc in Dilute Aqueous Sodium Chloride
Natalie Wint
Khalil Khan
James Sullivan
Hamilton McMurray
title_short Concentration Effects on the Spatial Interaction of Corrosion Pits Occurring on Zinc in Dilute Aqueous Sodium Chloride
title_full Concentration Effects on the Spatial Interaction of Corrosion Pits Occurring on Zinc in Dilute Aqueous Sodium Chloride
title_fullStr Concentration Effects on the Spatial Interaction of Corrosion Pits Occurring on Zinc in Dilute Aqueous Sodium Chloride
title_full_unstemmed Concentration Effects on the Spatial Interaction of Corrosion Pits Occurring on Zinc in Dilute Aqueous Sodium Chloride
title_sort Concentration Effects on the Spatial Interaction of Corrosion Pits Occurring on Zinc in Dilute Aqueous Sodium Chloride
author_id_str_mv 5be5dcc4b97c78b3063e258add4fff5c
a64a2b7f7a9a913f39aab88f735b38ed
40e32d66748ab74184a31207ab145708
56fc1b17ffc3bdf6039dc05c6eba7f2a
author_id_fullname_str_mv 5be5dcc4b97c78b3063e258add4fff5c_***_Natalie Wint
a64a2b7f7a9a913f39aab88f735b38ed_***_Khalil Khan
40e32d66748ab74184a31207ab145708_***_James Sullivan
56fc1b17ffc3bdf6039dc05c6eba7f2a_***_Hamilton McMurray
author Natalie Wint
Khalil Khan
James Sullivan
Hamilton McMurray
author2 Natalie Wint
Khalil Khan
James Sullivan
Hamilton McMurray
format Journal article
container_title Journal of The Electrochemical Society
container_volume 166
container_issue 11
container_start_page C3028
publishDate 2019
institution Swansea University
issn 0013-4651
1945-7111
doi_str_mv 10.1149/2.0051911jes
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 - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
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description The scanning vibrating electrode technique is used to study the localized corrosion of unpolarized zinc in near-neutral aqueous sodium chloride electrolyte of varying concentration [NaCl]. As [NaCl] is reduced from 1% (w/v) to 0.0005% (w/v) the morphology of attack changes from large, irregular, areas of anodic zinc dissolution and cathodic oxygen reduction, to a regular array of anodic pits set in an otherwise cathodic surface. In dilute electrolyte ([NaCl] < 0.01%) the total (area averaged) corrosion current density, J, (A·m−2), obtained from a numerical area integral of SVET anodic current density data, is shown to vary with approximately the square root of [NaCl]. The number density of pits, n (m−2) is shown to decrease with increasing [NaCl]. The mean individual pit current, ipit¯¯¯¯, (A = J/n) varies with approximately the square root of [NaCl]. A simple geometric analysis, based on a calculation of the radial dependence of electrical resistance exhibited by a hemispherical shell of electrolyte concentric with the pit, is used to explain the relationship between ohmic potential drop in the external solution, solution conductivity, and the radial distance away from an existing active pit.
published_date 2019-01-24T03:58:51Z
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score 11.012924

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