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Inhibition of corrosion driven delamination on iron by smart-release bentonite cation-exchange pigments studied using a scanning Kelvin probe technique

G. Williams, H.N McMurray, Geraint Williams Orcid Logo

6th International Conference: Advances in Corrosion Protection by Organic Coatings, Volume: 102, Pages: 18 - 28

Swansea University Author: Geraint Williams Orcid Logo

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DOI (Published version): 10.1016/j.porgcoat.2016.03.004

Abstract

Low-cost, environmentally friendly, cation exchange pigments derived from naturally occurring bentonite clay are shown to significantly enhance resistance to corrosion-driven cathodic delamination in organic coatings adherent to iron surfaces. A scanning Kelvin probe (SKP) is used to study the delam...

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Published in: 6th International Conference: Advances in Corrosion Protection by Organic Coatings
ISSN: 0300-9440
Published: 2017
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa26933
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first_indexed 2016-03-25T02:00:16Z
last_indexed 2018-02-09T05:09:28Z
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spelling 2017-01-10T10:15:37.7463088 v2 26933 2016-03-24 Inhibition of corrosion driven delamination on iron by smart-release bentonite cation-exchange pigments studied using a scanning Kelvin probe technique 0d8fc8d44e2a3c88ce61832f66f20d82 0000-0002-3399-5142 Geraint Williams Geraint Williams true false 2016-03-24 MTLS Low-cost, environmentally friendly, cation exchange pigments derived from naturally occurring bentonite clay are shown to significantly enhance resistance to corrosion-driven cathodic delamination in organic coatings adherent to iron surfaces. A scanning Kelvin probe (SKP) is used to study the delamination kinetics of pigmented and unpigmented poly-vinyl-butyral (PVB)-based coatings applied to polished iron substrates. The bentonite clay is used both in its native form and exhaustively exchanged with a range of divalent alkali earth and trivalent rare earth metal cations. For the best performing divalent cation-exchanged pigment, the dependence of coating delamination rate on pigment volume fraction is determined and compared with that of a conventional strontium chromate (SrCrO4) inhibitor. An inhibition mechanism is proposed for the bentonite pigments whereby underfilm cation release and subsequent precipitation of sparingly soluble hydroxides reduces the conductivity of the underfilm electrolyte. Journal Article 6th International Conference: Advances in Corrosion Protection by Organic Coatings 102 18 28 0300-9440 31 1 2017 2017-01-31 10.1016/j.porgcoat.2016.03.004 COLLEGE NANME Materials Science and Engineering COLLEGE CODE MTLS Swansea University 2017-01-10T10:15:37.7463088 2016-03-24T07:49:39.3424208 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering G. Williams 1 H.N McMurray 2 Geraint Williams 0000-0002-3399-5142 3 0026933-26042016154724.pdf Bentonite-Fe__v2__compiled.pdf 2016-04-26T15:47:24.0070000 Output 1744124 application/pdf Accepted Manuscript true 2017-03-22T00:00:00.0000000 Can be published but embargo until 22 March 2017. false
title Inhibition of corrosion driven delamination on iron by smart-release bentonite cation-exchange pigments studied using a scanning Kelvin probe technique
spellingShingle Inhibition of corrosion driven delamination on iron by smart-release bentonite cation-exchange pigments studied using a scanning Kelvin probe technique
Geraint Williams
title_short Inhibition of corrosion driven delamination on iron by smart-release bentonite cation-exchange pigments studied using a scanning Kelvin probe technique
title_full Inhibition of corrosion driven delamination on iron by smart-release bentonite cation-exchange pigments studied using a scanning Kelvin probe technique
title_fullStr Inhibition of corrosion driven delamination on iron by smart-release bentonite cation-exchange pigments studied using a scanning Kelvin probe technique
title_full_unstemmed Inhibition of corrosion driven delamination on iron by smart-release bentonite cation-exchange pigments studied using a scanning Kelvin probe technique
title_sort Inhibition of corrosion driven delamination on iron by smart-release bentonite cation-exchange pigments studied using a scanning Kelvin probe technique
author_id_str_mv 0d8fc8d44e2a3c88ce61832f66f20d82
author_id_fullname_str_mv 0d8fc8d44e2a3c88ce61832f66f20d82_***_Geraint Williams
author Geraint Williams
author2 G. Williams
H.N McMurray
Geraint Williams
format Journal article
container_title 6th International Conference: Advances in Corrosion Protection by Organic Coatings
container_volume 102
container_start_page 18
publishDate 2017
institution Swansea University
issn 0300-9440
doi_str_mv 10.1016/j.porgcoat.2016.03.004
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 Low-cost, environmentally friendly, cation exchange pigments derived from naturally occurring bentonite clay are shown to significantly enhance resistance to corrosion-driven cathodic delamination in organic coatings adherent to iron surfaces. A scanning Kelvin probe (SKP) is used to study the delamination kinetics of pigmented and unpigmented poly-vinyl-butyral (PVB)-based coatings applied to polished iron substrates. The bentonite clay is used both in its native form and exhaustively exchanged with a range of divalent alkali earth and trivalent rare earth metal cations. For the best performing divalent cation-exchanged pigment, the dependence of coating delamination rate on pigment volume fraction is determined and compared with that of a conventional strontium chromate (SrCrO4) inhibitor. An inhibition mechanism is proposed for the bentonite pigments whereby underfilm cation release and subsequent precipitation of sparingly soluble hydroxides reduces the conductivity of the underfilm electrolyte.
published_date 2017-01-31T03:32:30Z
_version_ 1763751337134129152
score 11.014067

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