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11. Jun 2021 | Application Areas

Novel two-component self-healing coating

Researchers have presented a self-healing coating comprising vinyl ester resin-filled microcapsules with prolonged anticorrosion performance.
 A sample containing 20 wt% microcapsules showed no signs of corrosion after 50 days of exposure in a standard salt spray test chamber.
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.

EC Library Anticorrosive Coatings

Books

Anticorrosive Coatings

This book brings together all the disciplines involved in the creation and use of corrosion protection coatings for metals. It presents the latest insights into the quality and chemistry of surfaces, the proper way to prepare them by conversion treatment, the function of resins and anticorrosion pigments in paints, and novel concepts in corrosion protection. As an added bonus, all the standards and directives mentioned in the text are grouped together in their own chapter for a better overview.

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