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Tuesday, 29 September 2020
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Raw materials & technologies, Technologies

Controlled release of corrosion inhibitors in self-healing epoxy coatings

Tuesday, 15 September 2020

Scientists describe the fabrication of β-cyclodextrin modified halloysite nanocapsules for controlled release of corrosion inhibitors in self-healing epoxy coatings.

The controlled release of corrosion inhibitors in self-healing epoxy coatings has been investigated. Image source: epublica - Pixabay (symbol image).

The controlled release of corrosion inhibitors in self-healing epoxy coatings has been investigated. Image source: epublica - Pixabay (symbol image).

An effective pH-responsive halloysite with β-cyclodextrin shell was demonstrated to control the release of the inhibitor trapped in the halloysite channel. The effect of solution pH variation on the release behavior of nanocapsules was taken into account.

Self-healing effect

The trapping mechanism by the β-CD molecules was investigated by quantum chemistry calculations. Commercial epoxy coating doped with various concentrations of benzotriazole-loaded containers showed a self-healing effect after 42 h of immersion in 0.5 M NaCl solution of the released benzotriazole.

The EIS results confirmed the beneficial effect of the exact concentration of the benzotriazole-loaded container on the barrier properties of the epoxy coating, as distinct from increasing the impedance modulus.

The study has been published in Progress in Organic Coatings, Volume 145, August 2020.

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