Anticorrosive behavior of calcium carbonate in alkyd-based paints

The scope of a current work is to study the effect of calcium carbonate developed from different sources (e.g. natural calcite, marble and egg shell wastes) on the corrosion protection performance of anticorrosive coatings.

Brown egg shell with egg yolk in it.
The corrosion efficiency of the eggshell was found to be the best of the calcium carbonate sources used in the study due to its unique particle shape structure. Source: Bru-nO / Pixabay. -

Great progress has been devoted recently in corrosion protection of metals via using cheap and efficient protective organic coatings. Calcium carbonate is common filler used in coatings industry due to its distinctive properties and the variation of its sources. The different calcium carbonate sources were characterised using different analytical techniques, such as X-ray diffraction (XRD), X-ray fluorescence, scanning electron microscopy (SEM) and transmission electron microscopy (TEM).

Corrosion protection performance of calcium carbonate coatings

The three calcium carbonates were then incorporated in solvent-based paint formulations using medium oil-modified soya-bean dehydrated castor oil alkyd resin. The physico-mechanical properties of dry films were tested. Immersion test, electrochemical impedance spectroscopy and SEM/EDAX were used to inspect the corrosion protection performance of coatings containing the three sources of calcium carbonate. The results showed that the corrosion efficiency of egg shell was the best among the three sources due to its unique particle shape structure.

The study is published in: Progress in Organic Coatings Volume 128, March 2019, Pages 168-180.

Image source: Pixabay

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