A heavy-duty anticorrosive coating with synergistic effect of corrosion inhibition and self-healing and a preparation method thereof

By combining a superhydrophobic substrate and a self-healing polyurethane topcoat, the problems of easy damage to polyurethane coatings and uneven dispersion of corrosion inhibitors are solved, achieving self-healing and corrosion inhibition effects of the coating, and improving corrosion resistance and service life.

CN120005504BActive Publication Date: 2026-07-24TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
Filing Date
2025-03-07
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing polyurethane coatings are easily damaged under external forces, leading to the failure of their physical barrier properties. Furthermore, nano-containers loaded with corrosion inhibitors tend to agglomerate, making it impossible to uniformly disperse and rapidly release the corrosion inhibitors, thus failing to effectively prevent metal corrosion.

Method used

The coating design employs a combination of a superhydrophobic underlayer and a self-healing polyurethane top layer. The superhydrophobic underlayer contains polyaniline-modified hexagonal boron nitride composite nanoparticles loaded with corrosion inhibitors, while the self-healing polyurethane top layer rapidly repairs cracks through polyurethane containing DA reversible covalent bonds.

Benefits of technology

It enables the rapid release of corrosion inhibitors and self-healing of the coating during corrosion reactions, improving corrosion resistance and service life, and avoiding internal defects and moisture diffusion in the coating.

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Abstract

The application provides a heavy-duty anticorrosive coating with synergistic effect of corrosion inhibition and self-healing and a preparation method thereof, which comprises a super-hydrophobic bottom layer and a self-healing polyurethane top layer compounded on the super-hydrophobic bottom layer, wherein the super-hydrophobic bottom layer comprises polyphenylamine in-situ modified hexagonal boron nitride composite nanoparticles loaded with corrosion inhibitors, an epoxy resin, a curing agent and a silane coupling agent; and the self-healing polyurethane top layer comprises polyurethane containing DA reversible covalent bonds and an organic solvent. The heavy-duty anticorrosive coating with synergistic effect of corrosion inhibition and self-healing comprises a super-hydrophobic bottom layer and a self-healing polyurethane top layer. The functional nanosheet loaded with corrosion inhibitors is prepared into a super-hydrophobic layer as the bottom layer, which can avoid the problem of uneven dispersion of nanomaterials in the resin coating and cause internal micro-defects of the coating. On the other hand, when a corrosion reaction occurs at the coating interface, the corrosion inhibitor in the super-hydrophobic bottom layer can quickly play a role in corrosion inhibition and passivation to prevent the corrosion reaction of the metal interface.
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