Linseed oil encapsulated self-healing anticorrosive coating

In a new study a linseed oil encapsulated self-healing coating was developed by incorporating 10 wt% synthesized microcapsules into an epoxy-polyamine coating matrix.

The scratched self-healing coating cannot recover the barrier property as good as the intact coating. Source: 1588877 / Pixabay. -

The linseed oil encapsulated polyurea-formaldehyde (PUF) microcapsules had ∼80 wt% core content with ∼80 um diameter. The influence of embedded microcapsules on the anticorrosive property of the self-healing coating had been studied by electrochemical impedance spectroscopy. The intact self-healing coating exhibited excellent anticorrosive property as the intact pure epoxy coating, although the addition of microcapsules into the epoxy matrix resulted in a higher water-uptake.

Failure of scratched self-healing coating

The scratched self-healing coating showed excellent healing ability and corrosion inhibition function for microcracks, but it still cannot recover the barrier property as good as the intact coating. The failure of the scratched self-healing coating had been analyzed and the possible reason may be the formation of conductive pathways at the interface between the linseed oil film and the epoxy matrix and/or PUF microcapsule shell.

The study is published in: Progress in Organic Coatings Volume 118, May 2018, Pages 108-115.

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