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The role of benzotriazole modified zinc phosphate in preventing corrosion-driven organic coating disbondment on galvanised steel / Natalie Wint, Chris Griffiths, Curtis Richards, Geraint Williams, Hamilton McMurray

Corrosion Science, Volume: 174, Start page: 108839

Swansea University Authors: Natalie Wint, Chris Griffiths, Curtis Richards, Geraint Williams, Hamilton McMurray

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Abstract

A simple modification using adsorbed benzotriazole is shown to significantly improve the performance of zinc phosphate corrosion inhibitive pigment in slowing rates of organic coating failure. The novel inhibitor, ZnPhos-BTA, is dispersed within a model coating and the scanning Kelvin probe (SKP) is...

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Published in: Corrosion Science
ISSN: 0010-938X
Published: Elsevier BV 2020
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa54592
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Abstract: A simple modification using adsorbed benzotriazole is shown to significantly improve the performance of zinc phosphate corrosion inhibitive pigment in slowing rates of organic coating failure. The novel inhibitor, ZnPhos-BTA, is dispersed within a model coating and the scanning Kelvin probe (SKP) is used to monitor corrosion driven cathodic coating delamination from hot dip galvanized steel (HDG). Disbondment kinetics are obtained as a function of pigment volume fraction (ϕ) and compared to those obtained for unmodified ZnPhos. Additions of 0.1 ϕ ZnPhos-BTA result in an almost 20-fold reduction in delamination rate compared to standard ZnPhos at the equivalent volume fraction.
Keywords: A. Steel; A. Zinc; A. Organic Coatings; C. Atmospheric Corrosion
Start Page: 108839