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Inhibition of corrosion-driven organic coating delamination and filiform corrosion on iron by phenyl phosphonic acid

C.F. Glover, G. Williams, Geraint Williams Orcid Logo

6th International Conference: Advances in Corrosion Protection by Organic Coatings, Volume: 102, Pages: 44 - 52

Swansea University Author: Geraint Williams Orcid Logo

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DOI (Published version): 10.1016/j.porgcoat.2016.03.006

Abstract

In-coating phenyl phosphonic acid (H2PP) additions are investigated as inhibitors of corrosion-driven organic coating disbondment and anodic filiform corrosion (FFC) on iron surfaces. In-situ scanning Kelvin probe (SKP) experiments under atmospheric corrosion conditions are used to study the influen...

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Published in: 6th International Conference: Advances in Corrosion Protection by Organic Coatings
ISSN: 0300-9440
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa26934
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first_indexed 2016-03-25T02:00:16Z
last_indexed 2018-02-09T05:09:28Z
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spelling 2017-01-10T10:15:01.8347244 v2 26934 2016-03-24 Inhibition of corrosion-driven organic coating delamination and filiform corrosion on iron by phenyl phosphonic acid 0d8fc8d44e2a3c88ce61832f66f20d82 0000-0002-3399-5142 Geraint Williams Geraint Williams true false 2016-03-24 MTLS In-coating phenyl phosphonic acid (H2PP) additions are investigated as inhibitors of corrosion-driven organic coating disbondment and anodic filiform corrosion (FFC) on iron surfaces. In-situ scanning Kelvin probe (SKP) experiments under atmospheric corrosion conditions are used to study the influence of the quantity of dissolved H2PP in the organic coating on the kinetics of cathodic delamination. It is demonstrated that, in a standard delamination investigation, increasing levels of H2PP progressively decrease the delamination rate up to 55%. In-coating H2PP additions are shown to be much more effective in a realistic scenario where electrolyte additions are made to a scribed defect and rates of cathodic disbondment are slowed by up to 99%. From the observed delamination kinetics, an inhibition mechanism is proposed whereby H2PP additions interact with the underlying iron to form an interfacial salt layer that blocks underfilm oxygen reduction. In terms of FFC inhibition, a threshold has been established whereby, with additions of 10% or below H2PP is shown to enhance the filament propagation rate due Cl− attack via an insufficient blocking layer. However, above 10% H2PP additions, propagation is slowed by up to 76%. Journal Article 6th International Conference: Advances in Corrosion Protection by Organic Coatings 102 44 52 0300-9440 31 1 2017 2017-01-31 10.1016/j.porgcoat.2016.03.006 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2017-01-10T10:15:01.8347244 2016-03-24T07:51:25.8633176 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering C.F. Glover 1 G. Williams 2 Geraint Williams 0000-0002-3399-5142 3
title Inhibition of corrosion-driven organic coating delamination and filiform corrosion on iron by phenyl phosphonic acid
spellingShingle Inhibition of corrosion-driven organic coating delamination and filiform corrosion on iron by phenyl phosphonic acid
Geraint Williams
title_short Inhibition of corrosion-driven organic coating delamination and filiform corrosion on iron by phenyl phosphonic acid
title_full Inhibition of corrosion-driven organic coating delamination and filiform corrosion on iron by phenyl phosphonic acid
title_fullStr Inhibition of corrosion-driven organic coating delamination and filiform corrosion on iron by phenyl phosphonic acid
title_full_unstemmed Inhibition of corrosion-driven organic coating delamination and filiform corrosion on iron by phenyl phosphonic acid
title_sort Inhibition of corrosion-driven organic coating delamination and filiform corrosion on iron by phenyl phosphonic acid
author_id_str_mv 0d8fc8d44e2a3c88ce61832f66f20d82
author_id_fullname_str_mv 0d8fc8d44e2a3c88ce61832f66f20d82_***_Geraint Williams
author Geraint Williams
author2 C.F. Glover
G. Williams
Geraint Williams
format Journal article
container_title 6th International Conference: Advances in Corrosion Protection by Organic Coatings
container_volume 102
container_start_page 44
publishDate 2017
institution Swansea University
issn 0300-9440
doi_str_mv 10.1016/j.porgcoat.2016.03.006
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
active_str 0
description In-coating phenyl phosphonic acid (H2PP) additions are investigated as inhibitors of corrosion-driven organic coating disbondment and anodic filiform corrosion (FFC) on iron surfaces. In-situ scanning Kelvin probe (SKP) experiments under atmospheric corrosion conditions are used to study the influence of the quantity of dissolved H2PP in the organic coating on the kinetics of cathodic delamination. It is demonstrated that, in a standard delamination investigation, increasing levels of H2PP progressively decrease the delamination rate up to 55%. In-coating H2PP additions are shown to be much more effective in a realistic scenario where electrolyte additions are made to a scribed defect and rates of cathodic disbondment are slowed by up to 99%. From the observed delamination kinetics, an inhibition mechanism is proposed whereby H2PP additions interact with the underlying iron to form an interfacial salt layer that blocks underfilm oxygen reduction. In terms of FFC inhibition, a threshold has been established whereby, with additions of 10% or below H2PP is shown to enhance the filament propagation rate due Cl− attack via an insufficient blocking layer. However, above 10% H2PP additions, propagation is slowed by up to 76%.
published_date 2017-01-31T03:32:30Z
_version_ 1763751337254715392
score 11.035655

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