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Evaluation of multi-layered graphene nano-platelet composite coatings for corrosion control part II – Cathodic delamination kinetics / C.F. Glover; C.A.J. Richards; Geraint Williams; Hamilton McMurray

Corrosion Science, Volume: 136, Pages: 304 - 310

Swansea University Authors: Geraint, Williams, Hamilton, McMurray

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Abstract

In-situ Scanning Kelvin probe (SKP) measurements are used to follow the corrosion-driven cathodic delamination kinetics of model coatings comprising graphene nano-platelets (GNP) dispersed in polyvinylbutyral (PVB) adherent to iron and zinc (galvanised steel). To reduce delamination rates by >90%...

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Published in: Corrosion Science
ISSN: 0010-938X
Published: 2018
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa39083
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Abstract: In-situ Scanning Kelvin probe (SKP) measurements are used to follow the corrosion-driven cathodic delamination kinetics of model coatings comprising graphene nano-platelets (GNP) dispersed in polyvinylbutyral (PVB) adherent to iron and zinc (galvanised steel). To reduce delamination rates by >90% (relative to unpigmented PVB) a GNP volume fraction of 0.056 is required on iron but only 0.028 on zinc. On this basis, together with work function and O2 permeability data it is proposed that the GNP acts principally to slow through-coating oxygen transport on iron; whereas on zinc a galvanic couple forms between zinc and GNP, displacing cathodic oxygen reduction.
Keywords: Graphene nano-platelets; scanning Kelvin probe; cathodic delamination; iron; zinc
College: College of Engineering
Start Page: 304
End Page: 310