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Study of the Effect of Foam Substrate Material on Hydrophobic Coating Efficiency

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Abstract:

This study examines the fabrication and performance of hydrophobic copper and nickel foams produced via a two-step immersion coating method using silver nitrate and stearic acid, targeting oil–water separation and corrosion protection in marine-related environments. In both substrates, silver deposition generated hierarchical surface roughness, while stearic acid functionalization reduced surface energy. Surface morphology and coating integrity were analyzed using scanning electron microscopy (SEM), and wettability was evaluated through water contact angle measurements. Copper foams exhibited water contact angles approaching 180°, demonstrated improved coating adhesion and separation efficiency remained above 95 % over repeated use. Copper-based superhydrophobic foams also showed excellent thermal and chemical stability, maintaining hydrophobicity after prolonged exposure to harsh conditions. Nickel foams developed a strongly adhered hydrophobic silver coating with water contact angles of approximately 147°. The coatings maintained high hydrophobicity across a wide temperature range and exhibited excellent reusability, achieving oil–water separation efficiencies higher than 95 % after multiple cycles. Potentiodynamic polarization was employed to evaluate corrosion behavior of both coated substrates in 3.5 % NaCl solution. Overall, the results indicate that while the same coating effectively provides hydrophobicity and durability to both copper and nickel foams, differences in wettability and coating stability are determined by their intrinsic microstructures.

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Periodical:

Solid State Phenomena (Volume 391)

Pages:

95-106

DOI:

https://doi.org/10.4028/p-Az4zHs

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Online since:

April 2026

Authors:

Aikaterini Baxevani, Eleni Lamprou*, Fani Stergioudi, Nikolaos Michailidis

Keywords:

Coating, Corrosion, Hydrophobicity, Metal Foams, Oil-Separation Efficiency, Stability

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Creative Commons CC BY 4.0

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* - Corresponding Author

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