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The Effect of Phase Continuity on the Cathodic Delamination Resistance of Polyaniline Based Coatings

Natalie Wint, A. Bennett, Geraint Williams Orcid Logo, Hamilton McMurray

Journal of The Electrochemical Society, Volume: 165, Issue: 13, Pages: C890 - C899

Swansea University Authors: Natalie Wint, Geraint Williams Orcid Logo, Hamilton McMurray

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DOI (Published version): 10.1149/2.0801813jes

Abstract

Organic coatings based on electrically conducting polyaniline emeraldine salts (ES) and electrically insulating polyvinyl butyral (PVB) are applied to an iron substrate. An investigation is made into how ES phase continuity, and in-coating charge percolation, affect the kinetics and mechanism of cor...

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Published in: Journal of The Electrochemical Society
ISSN: 0013-4651 1945-7111
Published: The Electrochemical Society 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa44758
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spelling 2020-09-22T10:19:30.9354066 v2 44758 2018-10-04 The Effect of Phase Continuity on the Cathodic Delamination Resistance of Polyaniline Based Coatings 5be5dcc4b97c78b3063e258add4fff5c Natalie Wint Natalie Wint true false 0d8fc8d44e2a3c88ce61832f66f20d82 0000-0002-3399-5142 Geraint Williams Geraint Williams true false 56fc1b17ffc3bdf6039dc05c6eba7f2a Hamilton McMurray Hamilton McMurray true false 2018-10-04 FGSEN Organic coatings based on electrically conducting polyaniline emeraldine salts (ES) and electrically insulating polyvinyl butyral (PVB) are applied to an iron substrate. An investigation is made into how ES phase continuity, and in-coating charge percolation, affect the kinetics and mechanism of corrosion driven cathodic coating delamination. Bilayer coatings are prepared by solution casting continuous ES films onto the substrate, then overcoating with PVB. These are compared with composite coatings of decreased phase continuity, prepared using ES powders dispersed in PVB. Coating delamination is followed using scanning Kelvin probe potentiometry and optical spectrophotometry. At ES coating weights < 0.05 mg.cm−2, delamination rate was inversely proportional to coating weight and slower for bilayer coatings. The same trend was found at higher coating weights for ES doped using camphorsulfonic acid. However, for ES doped with phenylphosphonic acid, bilayer coating delamination rates became independent of ES coating weight > 0.05 mg.cm−2 and were greater than for dispersion coatings. The relationship between cathodic delamination rate and PAni ES continuity is proposed to depend strongly upon the nature and continuity of the interphase formed between the PAni ES coating and iron, and therefore on the dopant anion identity. Journal Article Journal of The Electrochemical Society 165 13 C890 C899 The Electrochemical Society 0013-4651 1945-7111 Inhibitors, Cathodic Delamination, Conducting Polymers, Iron 5 10 2018 2018-10-05 10.1149/2.0801813jes COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2020-09-22T10:19:30.9354066 2018-10-04T09:04:06.8634750 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering Natalie Wint 1 A. Bennett 2 Geraint Williams 0000-0002-3399-5142 3 Hamilton McMurray 4 0044758-04102018090548.pdf wint2018(2).pdf 2018-10-04T09:05:48.9430000 Output 7500342 application/pdf Accepted Manuscript true 2019-10-05T00:00:00.0000000 true eng
title The Effect of Phase Continuity on the Cathodic Delamination Resistance of Polyaniline Based Coatings
spellingShingle The Effect of Phase Continuity on the Cathodic Delamination Resistance of Polyaniline Based Coatings
Natalie Wint
Geraint Williams
Hamilton McMurray
title_short The Effect of Phase Continuity on the Cathodic Delamination Resistance of Polyaniline Based Coatings
title_full The Effect of Phase Continuity on the Cathodic Delamination Resistance of Polyaniline Based Coatings
title_fullStr The Effect of Phase Continuity on the Cathodic Delamination Resistance of Polyaniline Based Coatings
title_full_unstemmed The Effect of Phase Continuity on the Cathodic Delamination Resistance of Polyaniline Based Coatings
title_sort The Effect of Phase Continuity on the Cathodic Delamination Resistance of Polyaniline Based Coatings
author_id_str_mv 5be5dcc4b97c78b3063e258add4fff5c
0d8fc8d44e2a3c88ce61832f66f20d82
56fc1b17ffc3bdf6039dc05c6eba7f2a
author_id_fullname_str_mv 5be5dcc4b97c78b3063e258add4fff5c_***_Natalie Wint
0d8fc8d44e2a3c88ce61832f66f20d82_***_Geraint Williams
56fc1b17ffc3bdf6039dc05c6eba7f2a_***_Hamilton McMurray
author Natalie Wint
Geraint Williams
Hamilton McMurray
author2 Natalie Wint
A. Bennett
Geraint Williams
Hamilton McMurray
format Journal article
container_title Journal of The Electrochemical Society
container_volume 165
container_issue 13
container_start_page C890
publishDate 2018
institution Swansea University
issn 0013-4651
1945-7111
doi_str_mv 10.1149/2.0801813jes
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
active_str 0
description Organic coatings based on electrically conducting polyaniline emeraldine salts (ES) and electrically insulating polyvinyl butyral (PVB) are applied to an iron substrate. An investigation is made into how ES phase continuity, and in-coating charge percolation, affect the kinetics and mechanism of corrosion driven cathodic coating delamination. Bilayer coatings are prepared by solution casting continuous ES films onto the substrate, then overcoating with PVB. These are compared with composite coatings of decreased phase continuity, prepared using ES powders dispersed in PVB. Coating delamination is followed using scanning Kelvin probe potentiometry and optical spectrophotometry. At ES coating weights < 0.05 mg.cm−2, delamination rate was inversely proportional to coating weight and slower for bilayer coatings. The same trend was found at higher coating weights for ES doped using camphorsulfonic acid. However, for ES doped with phenylphosphonic acid, bilayer coating delamination rates became independent of ES coating weight > 0.05 mg.cm−2 and were greater than for dispersion coatings. The relationship between cathodic delamination rate and PAni ES continuity is proposed to depend strongly upon the nature and continuity of the interphase formed between the PAni ES coating and iron, and therefore on the dopant anion identity.
published_date 2018-10-05T03:56:08Z
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score 11.016235

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