Superhydrophobic Aluminium Surface to Enhance Corrosion Resistance and Obtain Self-Cleaning and Anti-Icing Ability

A facile environmentally acceptable surface roughening method using chemical etching in HCl/H O followed by grafting with n-octyltrimethoxysilane (AS-8) and 1H,1H,2H,2H-perfluorooctyltrimethoxysilane (FAS-8) was studied to fabricate a (super)hydrophobic aluminium surface. The ground aluminium surfac...

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Bibliographic Details
Published in:Molecules (Basel, Switzerland) Switzerland), 2022-02, Vol.27 (3), p.1099
Main Authors: Rodič, Peter, Kapun, Barbara, Milošev, Ingrid
Format: Article
Language:English
Subjects:
aluminium
Aluminum
anti-icing
Chemical etching
Cleaning
Contact angle
Corrosion
Corrosion resistance
Corrosion tests
Deicing
Durability
Energy
Etching
Ethanol
Grafting
Hydrogen peroxide
Hydrophobic surfaces
Hydrophobicity
Perfluoro compounds
Photoelectrons
Plasma etching
Profilometers
Protective coatings
Roughening
Salts
Scanning electron microscopy
self-cleaning
Silanes
Spectrum analysis
superhydrophobic surface
Surface properties
Surface roughness
Thermal resistance
Topography
Wettability
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Summary:A facile environmentally acceptable surface roughening method using chemical etching in HCl/H O followed by grafting with n-octyltrimethoxysilane (AS-8) and 1H,1H,2H,2H-perfluorooctyltrimethoxysilane (FAS-8) was studied to fabricate a (super)hydrophobic aluminium surface. The ground aluminium surface after selected etching times (before and after grafting), was characterised using a contact profilometer, optical tensiometer, scanning electron microscope coupled with an energy-dispersive spectroscope and X-ray photoelectron spectroscope to evaluate surface roughness, wettability, surface morphology and composition. The durability of the grafted surface was tested using thermal and UV resistance tests. The corrosion properties were evaluated using potentiodynamic measurements and standard salts spray testing, ASTM B117-19. Finally, the self-cleaning and anti-icing abilities were assessed. The grafted aluminium surface with octyl- or perfluorooctyl silane reflected the highly hydrophobic (AS-8) and superhydrophobic behaviour (FAS-8). Moreover, the different behaviour of the octyl- or perfluorooctyl chain in the silane molecule on modified surface properties was also noticed because durability tests confirmed greater thermal, UV stability and corrosion resistance of FAS-8 compared to AS-8. The aluminium etched for 2 min and grafted with FAS-8 also demonstrated an excellent self-cleaning and anti-icing performance.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules27031099