Nanostructured photocatalytic coatings for corrosion protection and surface repair

Corrosion is one of the most destructive processes in materials induced by environment. Protection and repair of metallic surfaces are major challenges in many engineering applications. We report a novel polyelectrolyte nanostructured coating incorporating the corrosion inhibitor, 8-hydroxyquinoline...

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Bibliographic Details
Published in:Surface & coatings technology 2013-12, Vol.237, p.320-327
Main Authors: He, Xingliang, Chiu, Chengwei, Esmacher, Mel J., Liang, Hong
Format: Article
Language:English
Subjects:
Applied sciences
Coatings
Corrosion
Corrosion environments
Corrosion prevention
Corrosion protection
Cross-disciplinary physics: materials science
rheology
EIS
Electrochemical impedance spectroscopy
Exact sciences and technology
Materials science
Metals. Metallurgy
Nanostructure
Nanostructured coating
Physics
Production techniques
Protective coatings
Repair
Surface reconstruction
Surface treatment
Surface treatments
Titanium dioxide
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Summary:Corrosion is one of the most destructive processes in materials induced by environment. Protection and repair of metallic surfaces are major challenges in many engineering applications. We report a novel polyelectrolyte nanostructured coating incorporating the corrosion inhibitor, 8-hydroxyquinoline (8-HQ), into titanium dioxide (TiO2) nanoparticles (NPs). The potentiodynamic polarization measurements and real-time electrochemical impedance spectroscopy (EIS) monitoring demonstrated that the nanostructured coating protected aluminum (Al) from corrosion. Photocatalytic TiO2 was able to release incorporated 8-HQ only with the exposure to UV light resulting in a self-healing effect. Real-time EIS results showed that a new passivated layer was formed after 8-HQ molecules were released. The research in interfaces brings insights in understanding new aspects of corrosion and surface repair. •A nanostructured photocatalytic coating.•Combination of structural and electrochemical analyses.•Enhanced corrosion resistance of aluminum substrate.•Optical repair of a corroded surface.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2013.06.038