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Next-generation automotive corrosion protective coatings based on novel pigments containing organic ions / GARETH JONES

Swansea University Author: GARETH JONES

  • E-Thesis under embargo until: 15th May 2027

DOI (Published version): 10.23889/SUThesis.70393

Abstract

In this thesis, different corrosion inhibitors and delivery systems are investigated as alternativesto current state of the art technologies to determine their influence on coating failure, focusingin particular on corrosion-driven cathodic delamination of organically coated hot dippedgalvanised ste...

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Published: Swansea University, Wales, UK 2025
Institution: Swansea University
Degree level: Doctoral
Degree name: EngD
Supervisor: Williams, G. and Keil, P.
URI: https://cronfa.swan.ac.uk/Record/cronfa70393
first_indexed 2025-09-18T11:23:36Z
last_indexed 2025-09-19T14:52:37Z
id cronfa70393
recordtype RisThesis
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spelling 2025-09-18T12:43:48.5510531 v2 70393 2025-09-18 Next-generation automotive corrosion protective coatings based on novel pigments containing organic ions fec3f3ab15ecdf176d7d6d24695d686a GARETH JONES GARETH JONES true false 2025-09-18 In this thesis, different corrosion inhibitors and delivery systems are investigated as alternativesto current state of the art technologies to determine their influence on coating failure, focusingin particular on corrosion-driven cathodic delamination of organically coated hot dippedgalvanised steel (HDG). In the work presented, electrochemical scanning techniques includingthe scanning Kelvin probe (SKP) and scanning vibrating electrode technique (SVET) areemployed to determine the influence of organic corrosion inhibitors when dispersed in anorganic coating, polyvinal butyral (PVB), or on a bare metal surface immersed in a 3.5 wt%NaCl solution.Different organic compounds were investigated with regard to their ability to reduce the ratesof cathodic delamination on HDG steel. Preliminary experiments involved incorporating theorganic compounds directly into PVB to determine their influence on cathodic delamination.2-mercaptobenzothiazole (2-MBT) provided the most effective protection, demonstrating nodelamination over 48 hours. 2-MBT was successfully exchanged into hydrotalcite (HT) in itsanionic form, to produce a smart release inhibitive pigment which significantly reduceddelamination rates of PVB over 48 hours but did not halt delamination.8-hydroxyquinoline (8-HQ) was investigated as a corrosion inhibitor for organically coatedHDG steel and on a bare metal defect. Initial results showed that dispersing 8-HQ directly intoan organic coating significantly reduced the rates of delamination. 8-HQ was exchange intoHT and amberlite, a cationic exchange resin, allowing 8-HQ to be stored in its cationic form.Neither form of stored inhibitor performed as effectively as direct coating additions.A novel organic inhibitor, phenanthroline, was investigated to observe its effect when HDGsteel is immersed in 3.5 wt% NaCl. A reduction in corrosion rates was observed as well as aprominent yellow film. However, due to the non-unform formation of the film, corrosion stillproceeded even at higher concentrations of phenanthroline Lastly, a cerium-based metal organic framework (MOF) was investigated as a delivery systemfor corrosion inhibitors. The MOF was dispersed into PVB and significantly reduceddelamination rates without the addition of any inhibitors. Incorporation of 8-HQ, 2-MBT andbenzotriazole (BTA) within the MOF showed a significant decrease in delamination with noneobserved with 2-MBT/MOF. E-Thesis Swansea University, Wales, UK Corrosion, Galvanised steel, Inhibitors, Cathodic Delamination, Organic coatings 15 5 2025 2025-05-15 10.23889/SUThesis.70393 COLLEGE NANME COLLEGE CODE Swansea University Williams, G. and Keil, P. Doctoral EngD EPSRC EPSRC 2025-09-18T12:43:48.5510531 2025-09-18T12:05:47.4248712 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering GARETH JONES 1 Under embargo Under embargo 2025-09-18T12:22:50.2964660 Output 7503294 application/pdf E-Thesis true 2027-05-15T00:00:00.0000000 Copyright: The author, Gareth Wyn Jones, 2024 true eng
title Next-generation automotive corrosion protective coatings based on novel pigments containing organic ions
spellingShingle Next-generation automotive corrosion protective coatings based on novel pigments containing organic ions
GARETH JONES
title_short Next-generation automotive corrosion protective coatings based on novel pigments containing organic ions
title_full Next-generation automotive corrosion protective coatings based on novel pigments containing organic ions
title_fullStr Next-generation automotive corrosion protective coatings based on novel pigments containing organic ions
title_full_unstemmed Next-generation automotive corrosion protective coatings based on novel pigments containing organic ions
title_sort Next-generation automotive corrosion protective coatings based on novel pigments containing organic ions
author_id_str_mv fec3f3ab15ecdf176d7d6d24695d686a
author_id_fullname_str_mv fec3f3ab15ecdf176d7d6d24695d686a_***_GARETH JONES
author GARETH JONES
author2 GARETH JONES
format E-Thesis
publishDate 2025
institution Swansea University
doi_str_mv 10.23889/SUThesis.70393
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 0
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description In this thesis, different corrosion inhibitors and delivery systems are investigated as alternativesto current state of the art technologies to determine their influence on coating failure, focusingin particular on corrosion-driven cathodic delamination of organically coated hot dippedgalvanised steel (HDG). In the work presented, electrochemical scanning techniques includingthe scanning Kelvin probe (SKP) and scanning vibrating electrode technique (SVET) areemployed to determine the influence of organic corrosion inhibitors when dispersed in anorganic coating, polyvinal butyral (PVB), or on a bare metal surface immersed in a 3.5 wt%NaCl solution.Different organic compounds were investigated with regard to their ability to reduce the ratesof cathodic delamination on HDG steel. Preliminary experiments involved incorporating theorganic compounds directly into PVB to determine their influence on cathodic delamination.2-mercaptobenzothiazole (2-MBT) provided the most effective protection, demonstrating nodelamination over 48 hours. 2-MBT was successfully exchanged into hydrotalcite (HT) in itsanionic form, to produce a smart release inhibitive pigment which significantly reduceddelamination rates of PVB over 48 hours but did not halt delamination.8-hydroxyquinoline (8-HQ) was investigated as a corrosion inhibitor for organically coatedHDG steel and on a bare metal defect. Initial results showed that dispersing 8-HQ directly intoan organic coating significantly reduced the rates of delamination. 8-HQ was exchange intoHT and amberlite, a cationic exchange resin, allowing 8-HQ to be stored in its cationic form.Neither form of stored inhibitor performed as effectively as direct coating additions.A novel organic inhibitor, phenanthroline, was investigated to observe its effect when HDGsteel is immersed in 3.5 wt% NaCl. A reduction in corrosion rates was observed as well as aprominent yellow film. However, due to the non-unform formation of the film, corrosion stillproceeded even at higher concentrations of phenanthroline Lastly, a cerium-based metal organic framework (MOF) was investigated as a delivery systemfor corrosion inhibitors. The MOF was dispersed into PVB and significantly reduceddelamination rates without the addition of any inhibitors. Incorporation of 8-HQ, 2-MBT andbenzotriazole (BTA) within the MOF showed a significant decrease in delamination with noneobserved with 2-MBT/MOF.
published_date 2025-05-15T18:06:49Z
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