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Monday, 14 October 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

Aluminum polyphosphate effects cathodic disbonding of epoxy

Tuesday, 18 February 2014

In the field of protective coatings, zinc-free pigments are proposed as promising anticorrosion compounds due to their good environmentally-friendly profile.

Zinc-free pigments are considered to be promising anticorrosion compounds

Source: Sasha Radosavljevic - Fotolia.com

Zinc-free pigments are considered to be promising anticorrosion compounds

Source: Sasha Radosavljevic - Fotolia.com

In a paper, R. Naderi and M. M. Attar, School of Metallurgy and Materials Engineering, University of Tehran, Iran, investigated the cathodic disbonding performance of a solvent-borne epoxy primer incorporating strontium aluminum polyphosphate (SAPP) as a zinc-free phosphate-based anticorrosion pigment in epoxy-polyamide coatings.

SAPP improves resistance to cathodic disbonding

Regardless of the applied potential, the presence of SAPP in the coating formulation caused slower growth of the delamination area in comparison to ZP. According to the data obtained from EIS and SEM/EDX, this behavior was attributed to locally controlled pH and the precipitated film restricting active zones available for electrochemical reactions.

The study is published in: Progress in Organic Coatings

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