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Direct to metal anti-corrosion coatings / GWYNFOR CALLAGHAN

Swansea University Author: GWYNFOR CALLAGHAN

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Abstract

The primary objective of this work was to evaluate the corrosion driven coating failure mechanisms affecting a commercial polyurethane coating (RAPTOR), traditionally applied as a topcoat, when instead directly applied to iron. This was done by evaluating its susceptibility to corrosion driven catho...

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Published: Swansea 2021
Institution: Swansea University
Degree level: Master of Research
Degree name: MSc by Research
Supervisor: Wint Natalie ; Williams Geraint
URI: https://cronfa.swan.ac.uk/Record/cronfa58762
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first_indexed 2021-11-24T11:03:43Z
last_indexed 2021-11-25T04:18:05Z
id cronfa58762
recordtype RisThesis
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spelling 2021-11-24T11:17:45.9697381 v2 58762 2021-11-24 Direct to metal anti-corrosion coatings 17465ecefdc44bd2f47d9fe4cdfee794 GWYNFOR CALLAGHAN GWYNFOR CALLAGHAN true false 2021-11-24 The primary objective of this work was to evaluate the corrosion driven coating failure mechanisms affecting a commercial polyurethane coating (RAPTOR), traditionally applied as a topcoat, when instead directly applied to iron. This was done by evaluating its susceptibility to corrosion driven cathodic disbondment and Filiform corrosion. The effect of cure time on the completion of the polymerization reaction was characterised using ATR-FTIR. It showed a direct correlation between cure time and resistance to cathodic disbondment. The kinetics for cathodic disbondment was investigated using adapted Stratmann delamination cells as well as the scanning Kelvin probe. Free corrosion potential profiles were generated and allowed for the rate of delamination of RAPTOR from iron to be deduced. The rate limiting mechanism for the cathodic disbondment of RAPTOR was shown to be migration of electroactive species under the coating . Filiform corrosion was initiated via addition of an aqueous iron chloride solution to penetrative RAPTOR coating scribes. Samples were maintained at a relative humidity of 94 % . Image analysis software was used to evaluate the geometry of filaments formed and the results were compared to those obtained in the case of polyvinyl butyral coatings (PVB) Aluminium polyphosphate and glass flake pigments were evaluated as potential corrosion inhibitors. The inhibitive properties of Aluminium polyphosphate have been shown to reduce the rate of coating delamination via cathodic disbondment. This is proposed to be linked to the production of partially/insoluble precipitates that limit the migration of electroactive species. Aluminium polyphosphate has also shown to increase the initiation time required to form filaments during the filiform corrosion process. Glass flake had little influence on the rate of cathodic disbondment but was shown to limit both the initiation and propagation of filaments during filiform corrosion. E-Thesis Swansea Corrosion, coating, cathodic disbondment, Filiform corrosion 24 11 2021 2021-11-24 A selection of third party content is redacted or is partially redacted from this thesis due to copyright restrictions. COLLEGE NANME COLLEGE CODE Swansea University Wint Natalie ; Williams Geraint Master of Research MSc by Research 2021-11-24T11:17:45.9697381 2021-11-24T11:01:10.9485041 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised GWYNFOR CALLAGHAN 1 58762__21655__854a0bfe19d943b98aeeb81d4d731767.pdf Callaghan_Gwynfor_MSc_by_Research_Thesis_Final_Redacted.pdf 2021-11-24T11:12:53.1382431 Output 5508102 application/pdf Redacted version - open access true Copyright: The author, Gwynfor Callaghan, 2021. true eng
title Direct to metal anti-corrosion coatings
spellingShingle Direct to metal anti-corrosion coatings
GWYNFOR CALLAGHAN
title_short Direct to metal anti-corrosion coatings
title_full Direct to metal anti-corrosion coatings
title_fullStr Direct to metal anti-corrosion coatings
title_full_unstemmed Direct to metal anti-corrosion coatings
title_sort Direct to metal anti-corrosion coatings
author_id_str_mv 17465ecefdc44bd2f47d9fe4cdfee794
author_id_fullname_str_mv 17465ecefdc44bd2f47d9fe4cdfee794_***_GWYNFOR CALLAGHAN
author GWYNFOR CALLAGHAN
author2 GWYNFOR CALLAGHAN
format E-Thesis
publishDate 2021
institution Swansea University
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
active_str 0
description The primary objective of this work was to evaluate the corrosion driven coating failure mechanisms affecting a commercial polyurethane coating (RAPTOR), traditionally applied as a topcoat, when instead directly applied to iron. This was done by evaluating its susceptibility to corrosion driven cathodic disbondment and Filiform corrosion. The effect of cure time on the completion of the polymerization reaction was characterised using ATR-FTIR. It showed a direct correlation between cure time and resistance to cathodic disbondment. The kinetics for cathodic disbondment was investigated using adapted Stratmann delamination cells as well as the scanning Kelvin probe. Free corrosion potential profiles were generated and allowed for the rate of delamination of RAPTOR from iron to be deduced. The rate limiting mechanism for the cathodic disbondment of RAPTOR was shown to be migration of electroactive species under the coating . Filiform corrosion was initiated via addition of an aqueous iron chloride solution to penetrative RAPTOR coating scribes. Samples were maintained at a relative humidity of 94 % . Image analysis software was used to evaluate the geometry of filaments formed and the results were compared to those obtained in the case of polyvinyl butyral coatings (PVB) Aluminium polyphosphate and glass flake pigments were evaluated as potential corrosion inhibitors. The inhibitive properties of Aluminium polyphosphate have been shown to reduce the rate of coating delamination via cathodic disbondment. This is proposed to be linked to the production of partially/insoluble precipitates that limit the migration of electroactive species. Aluminium polyphosphate has also shown to increase the initiation time required to form filaments during the filiform corrosion process. Glass flake had little influence on the rate of cathodic disbondment but was shown to limit both the initiation and propagation of filaments during filiform corrosion.
published_date 2021-11-24T04:15:33Z
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score 11.036334

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