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Smart-release inhibition of corrosion driven organic coating failure on zinc by cationic benzotriazole based pigments

C.A.J. Richards, H.N. McMurray, G. Williams, Geraint Williams Orcid Logo, Hamilton McMurray

Corrosion Science

Swansea University Authors: Geraint Williams Orcid Logo, Hamilton McMurray

Abstract

A novel cationic benzotriazole pigment (CBP) based on the benzotriazolium cation (BTAH2+) exchanged into a sulfonated organic resin has been synthesized and evaluated as a means of inhibiting the corrosion-driven cathodic disbondment of organic coatings from the surface of galvanized steel. The CBP...

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Published in: Corrosion Science
ISSN: 0010-938X
Published: 2019
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa49933
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Abstract: A novel cationic benzotriazole pigment (CBP) based on the benzotriazolium cation (BTAH2+) exchanged into a sulfonated organic resin has been synthesized and evaluated as a means of inhibiting the corrosion-driven cathodic disbondment of organic coatings from the surface of galvanized steel. The CBP is acidic in nature (BTAH2+ pKa ≈ 1.1) and is intended to be compatible with acidic coating formulations such as etch-primers. Delamination rates, as measured using a scanning Kelvin probe (SKP), were found to decrease monotonically with increasing CBP volume fraction (ΦCBP) and to approach zero when ΦCBP = 0.1. The mechanism of CBP operation is described.
Keywords: benzotriazole, corrosion, inhibition, zinc, galvanized steel
College: College of Engineering