Water-Repellent Coatings on Corrosion Resistance by Femtosecond Laser Processing

Metal corrosion causes huge economic losses and major disasters every year. Inspired by the lotus leaf and nepenthes pitcher, the superhydrophobic surfaces (SHS) and the slippery liquid-infused porous surfaces (SLIPS) were produced as a potential strategy to prevent metal corrosion. However, how to...

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Bibliographic Details
Published in:Coatings (Basel) 2022-11, Vol.12 (11), p.1736
Main Authors: Zhao, Zexu, Luo, Guoyun, Cheng, Manping, Song, Lijun
Format: Article
Language:English
Subjects:
Alloys
Aluminum alloys
Aluminum base alloys
Coatings
Contact angle
Corrosion
Corrosion inhibitors
Corrosion mechanisms
Corrosion prevention
Corrosion resistance
Corrosion resistant alloys
Disaster management
Economic impact
Electrodes
Electrolytes
Energy
Femtosecond
Hydrophobic surfaces
Hydrophobicity
Industrial applications
Laser processing
Lasers
Lubricants
Lubricants industry
Lubrication and lubricants
Pitchers (Baseball)
Protective coatings
Seawater
Spectrum analysis
Steel
Substrates
Wettability
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Summary:Metal corrosion causes huge economic losses and major disasters every year. Inspired by the lotus leaf and nepenthes pitcher, the superhydrophobic surfaces (SHS) and the slippery liquid-infused porous surfaces (SLIPS) were produced as a potential strategy to prevent metal corrosion. However, how to prepare stable water-repellent coatings that can prevent the intrusion of corrosive ions remains to investigate. In this work, we first fabricated a micro/nano hierarchical structure on the aluminum surface by femtosecond laser processing. Then, the SHS was prepared on the above structure by fluorosilane modification. Finally, the SLIPS was fabricated on the SHS by coating lubricant. The morphology and wettability of the fabricated samples were evaluated by scanning electron microscopy and contact angle measurements. Furthermore, the corrosion resistance properties of SHS and SLIPS in simulated seawater were characterized by electrochemical measurements. From the comparison of the electrochemical parameters of different immersion times, both water-repellent coatings are effective in protecting the aluminum alloy from corrosion in simulated seawater due to reduced contact area between the metal substrate and corrosive solution. In comparison with the SHS, the SLIPS has a corrosion inhibition efficiency of up to 99.95% and it maintains long-term stability in the corrosive solution. This work also provides a promising method for the water-repellent coatings by femtosecond laser processing for metal corrosion prevention in practical industrial applications.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings12111736