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5. Jul 2021 | Application Areas

Self-healing epoxy coating for corrosion protection

A new study describes an epoxy coating based on tung oil-containing microcapsules for corrosion protection.
The coating contains tung oil-containing microcapsules for corrosion protection. 
Image source: candicelin - Pixabay (symbol image).

During the study, urea-formaldehyde (UF) microcapsules loaded with tung oil were prepared by in-situ polymerisation. The mean diameter of the obtained microcapsules was 8.5 μm. The self-healing coating was prepared by the addition of 5 wt.% microcapsules into an epoxy matrix and then painted on a AA2024 substrate. The effect on the coating properties after the incorporation of microcapsules was investigated by adhesion tests and electrochemical impedance spectroscopy (EIS). It is found that 5 wt.% microcapsules in coating formulations did not impart a significant negative effect on coating properties.

Good anti-corrosion performance

SEM and EIS tests were used to evaluate the self-healing effect. According to the fitting results of the EIS data on the scratched samples, the new film that formed by the polymerisation of tung oil at the scratched area in the self-healing coating displays a resistance value of more than 106 Ω·cm2, which is much higher than 103 Ω·cm2 of the oxide layer in the neat epoxy coating. The neutral salt spray tests also confirm the good anti-corrosion performance of the self-healing coating.

The study has been published in Progress in Organic Coatings, Volume 156, July 2021.

EC Techb Report Sustainability


EC Tech Report Sustainability

Making coating systems more environmentally compatible is a burning issue for everyone in the industry, and one that is being fuelled by the European Green Deal. Learn all you need to know about sustainable coatings, how to produce coatings in a more environmentally friendly way and how to give coated products a longer service life. You will find an overview in the EC Tech Report of the many various approaches being adopted. We will dive deep into the European Green Deal, its key points and main purpose as well as consequences for the coating industry, see which new raw materials are being developed to replace or lower the content of products in the SVHC group and learn about different approaches to sustainable paint formulation.

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