FCSE | Research Frontiers: Sunlight-Driven Self-Healing Anti-Corrosion Coatings

2025-06-07　·　Wuhan Kaiming High Tech Co., Ltd.

Published:

2025-06-07

Air, water and other corrosive media can damage metal through physical and chemical processes, wasting resources and affecting the environment. Protective coatings isolate the substrate from surrounding media and slow corrosion.

Protective coatings isolate metal from air, water and corrosive media. Coating density and corrosion resistance determine protection. Organic coatings are widely used because of their availability, resistance and ability to form dense layers, but environmental exposure can create microcracks that admit water and corrosive substances and reduce protection.

Lin Zhifeng and Li Weihua's research team at Sun Yat-sen University prepared an approximately 200μm epoxy coating containing Fe3O4 nanoparticles and tetradecanol. The source reports self-healing under sunlight and protection of the underlying carbon steel.Pending confirmation

The source describes self-healing coatings as a relatively recent development, first reported approximately 20 years earlier. They repair microcracks or damage to restore a barrier and extend life. Methods include external healing or corrosion inhibitors, dynamic polymer bonds, and thermoplastic or shape-memory materials. Many require UV light or heat, motivating coatings that heal under milder conditions.Pending confirmation

The source reports that Fe3O4 nanoparticle photothermal heating raised a self-healing coating to 70°C within 200s under simulated light, melting tetradecanol to fill defects. Surface holes and scratches repaired within three minutes. Tetradecanol content adjusts wettability; hydroxyl groups increase hydrophilicity. Outdoor testing reportedly repaired scratches within 93s. The source states corrosion protection above 99% before and after repair, resistance to O2, H2O and Cl− penetration, and stable protection after 168 hours in 3.5wt% NaCl solution.Pending confirmation

The source describes a sunlight-driven self-healing anti-corrosion coating with a simple preparation method, no additional artificial activation conditions and protection comparable to commercial coatings, suggesting potential for production and engineering applications.

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Methods and techniques for repairing equipment metal surfaces

Friction stir welding: a lower-cost method for welding steel plate and other high-melting-point materials

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