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Thursday, 19 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

Phosphate pigments enhance anticorrosive properties of epoxy coating

Thursday, 16 October 2014

Spanish researchers investigated the effect of the addition of anticorrosive phosphate pigments on the corrosion resistance of epoxy coating on cold rolled steel.

Anticorrosive phosphate pigments were incorporated in an epoxy coating on steel. Source: Marco Santi Amantini/Fotolia

Anticorrosive phosphate pigments were incorporated in an epoxy coating on steel. Source: Marco Santi Amantini/Fotolia

The effect of the addition of anticorrosive phosphate pigments (different types and quantities), standard zinc phosphate and organophilised zinc molybdate phosphate, on the corrosion resistance properties of epoxy coating on cold rolled steel has been investigated by means of two different techniques: a traditional one as salt spray (NSS) and an electrochemical one as the accelerated cyclic electrochemical test (ACET).

Corrosion resistance is correlated to coating formulation experimentally

The optimum anticorrosive phosphate pigment type and its content, that gave the best performance in this epoxy system, were determined. The results offered by each one of the techniques were quite similar, with the advantage that the ACET offered the results in a very short time (24 h) compared to salt spray test.

The study is published in: Progress in Organic Coatings, Volume 77, Issue 12, Part A, December 2014, Pages 2024-2030.

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