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The role of benzotriazole modified zinc phosphate in preventing corrosion-driven organic coating disbondment on galvanised steel

Natalie Wint, Christian Griffiths, Curtis Richards, Geraint Williams Orcid Logo, Hamilton McMurray

Corrosion Science, Volume: 174, Start page: 108839

Swansea University Authors: Natalie Wint, Christian Griffiths, Curtis Richards, Geraint Williams Orcid Logo, Hamilton McMurray

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DOI (Published version): 10.1016/j.corsci.2020.108839

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 1879-0496
Published: Elsevier BV 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa54592
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
College: Faculty of Science and Engineering
Funders: The authors would like to thank Tata Steel Europe for providing samples and EPSRC for the funding for the PhD studentship via an Industrial Case Award with Tata Steel Europe. (EP/L505699/1).
Start Page: 108839

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