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Thursday, 19 September 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

Anticorrosion properties of zinc-rich organic coatings improved

Wednesday, 14 March 2012

The corrosion resistance of zinc-rich coatings was improved mainly due to the decrease of zinc activity.

In a new study, the corrosion resistance of zinc-rich coatings was improved/ Source: Martina Berg - Fotolia.com

In a new study, the corrosion resistance of zinc-rich coatings was improved/ Source: Martina Berg - Fotolia.com

In a new study, the corrosion behaviour of zinc-rich coatings with various zinc contents in thin organic coatings was characterised. It was verified that both coatings with 60 volume percent of zinc powder and without zinc powder showed good corrosion resistance mainly due to the cathodic protection and barrier effect, respectively. On the other hand, coatings with an intermediate concentration (10 - 40 vol.%) of zinc powder were not successful in protecting a steel substrate efficiently. To improve anticorrosion properties of zinc-rich coatings, the surface modification of zinc particles was carried out with derivatives of phosphoric and phosphonic acid in the aqueous solution. The effects of the surface modification of zinc particles on corrosion resistance of the coating were investigated. The best anti-corrosion performance was achieved when the incorporated zinc particle was treated with phosphoric acid 2-ethylhexyl ester and calcium ion simultaneously, which induced the formation of alkyl-phosphate-calcium complex layer of 190 nm in thickness on zinc particles. Corrosion resistance was improved by the decreased zinc activity and the increased compatibility between the formed complex layer on zinc surface and polymer binder matrix. A paper on this study will appear in the May issue of "Progress in Organic Coatings”.

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