Smart epoxy coating for corrosion protection

A new study decribes a smart epoxy coating with mesoporous silica nanoparticles loaded with calcium phosphate for corrosion protection.

A corroded spot on a white painted surface.
Epoxy-based coatings are conventionally used for protection against CUI due to their superior mechanical and chemical properties that determine the extended overall lifespan of a coating Image source: Blende 11 - (symbol image).

During the study, calcium phosphate was encapsulated into mesoporous silica nanoparticles (MSN). The effect of pH on the structure and morphology of the MSN and the release of calcium phosphate from the MSN was investigated. Epoxy coatings with encapsulated (3 wt%) and non-encapsulated (3 wt% and 5 wt%) calcium phosphate were formulated and their anti-corrosive performance was evaluated.

Anti-corrosive performance

Results showed that encapsulation of the calcium phosphate as inhibitive pigment in the coating can enhance the anti-corrosive performance by preventing spontaneous pigment dissolution and controlling the pigment’s release from the coating.

The study has been published in Progress in Organic Coatings, Volume 165, April 2022.

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