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Sunday, 15 September 2019
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Raw materials & technologies, Applications

Combining inhibitive pigments and silica particles with powder coatings

Friday, 9 January 2015

The addition of organo-modified silica particles (OSP) to powder coating containing zinc molybdenum phosphate pigment (ZMP) has been investigated by Spanish researchers.

Two opposite effects of addition OSP to coatings containing ZMP were detected. Source: AkzoNobel

Two opposite effects of addition OSP to coatings containing ZMP were detected. Source: AkzoNobel

The OSP were directly incorporated at different concentrations (1, 2.5, 3.5 and 4.5 wt%) in a polyester powder monolayer coating with 10 wt% ZMP. The adhesion and anticorrosion properties were evaluated by means of adhesion studies and different electrochemical techniques: electrochemical impedance spectroscopy (EIS) and an accelerated cyclic electrochemical technique (ACET).

Optimal combined system was established for 1.0 wt% of OSP

The optimum quantity of OSP that gave maximum anticorrosive performance of the coating system was determined (1.0%), however two opposite effects of addition on the coatings led to a reduction of anticorrosive properties for higher contents. Finally, the electrochemical behaviour of the optimised combined system was compared to the effects achieved when both additives were separately added to powder coatings by means of an additional electrochemical test.

The study is published in: Progress in Organic Coatings, Volume 80, March 2015, Pages 11-19.

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