Novel two-component self-healing coating

Researchers have presented a self-healing coating comprising vinyl ester resin-filled microcapsules with prolonged anticorrosion performance.

Corrosion on a coated surface.
The coating shows superior self-healing ability in the scratched areas.  Image source: Gordon Bussiek - Fotolia (symbol image).

This study aimed to prolong the healing effects regarding anticorrosion performance by developing a self-healing epoxy-based coating comprising vinyl ester resin and benzoyl peroxide-filled microcapsules. For this purpose, dual-layer gelatin-gum Arabic/urea-formaldehyde (Gel-GA/PUF)-based microcapsules containing either benzoyl peroxide (BPO) or vinyl ester resin (VER) were prepared separately in a two steps synthesis approach using complex coacervation and in situ polymerization techniques, respectively.

No signs of corrosion

Thereafter, epoxy-based coatings containing 0, 2.5, 5, 10, 20 wt % of a combination of two types of microcapsules were prepared. The standard salt spray test and electrochemical impedance spectroscopy (EIS) were utilised to study the healing properties of microcapsules within the epoxy-based coating. The salt spray test and EIS results confirmed a long-lasting healing effect of the microcapsules embedded coating samples. The sample containing 20 wt% microcapsules showed no signs of corrosion after 50 days of exposure in a standard salt spray test chamber.

The review has been published in Progress in Organic Coatings, Volume 154, May 2021.

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