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Tuesday, 24 September 2019
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Raw materials & technologies, Technologies, Functional coatings

Smart protection of epoxy clear coatings doped with polystyrene microcapsules

Friday, 2 September 2016

Brazilian researchers have studied the self-healing effect of epoxy clear coatings doped with polystyrene microcapsules containing silanol and Ce (III) ions as corrosion inhibitors.

After a mechanical damage the doped system shows better performance due to the self-healing effect. Source: andreas stix/pixelio.de

After a mechanical damage the doped system shows better performance due to the self-healing effect. Source: andreas stix/pixelio.de

Polystyrene microcapsules loaded with octylsilanol and Ce (III) ions as core materials have been synthesised by solvent evaporation method from a double emulsion.

Mechanical defect was done

The obtained microcapsules were doped into an epoxy clear coating and applied on carbon steel. A mechanical defect was done on the coating, in order to evaluate the self-healing effect.

The self-healing effect provided by this system was studied by electrochemical impedance spectroscopy (EIS), scanning vibrating electrode technique (SVET) and accelerated corrosion tests in salt spray chamber (SSC) of the coated samples with a clear epoxy coating formulated with 30% w/w of polystyrene microcapsules.

Doped system showed better performance

For the samples with artificial defect, the performance of the microcapsule-formulated coating was better than the formulated without microcapsules, due to the release of the inhibitors, even after 120 h of immersion in 0.05 molL− 1 NaCl solution. The SVET results are in good agreement with the EIS results, showing the corrosion inhibition in the artificial defects done in coated samples and endorsed the marked self-healing effect. The accelerated tests in salt spray chamber have shown less corrosion products and minor blistering around the scratch for the coating formulated with inhibitor containing microcapsules after 144 h of exposure.

The study is published in: Surface and Coatings Technology, Volume 303, Part B, 15 October 2016, Pages 310–318

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