Smart-release inhibition of corrosion driven organic coating failure on zinc by cationic benzotriazole based pigments
By Richards, C. A. J.; McMurray, H. N.; Williams, G.
Published in Corrosion Science
2019
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 (?CBP) and to approach zero when ?CBP = 0.1. The mechanism of CBP operation is described.
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