News Coatings Technologies
Epoxy-based double-layer superhydrophobic coating delivers high mechanical durability and long-term corrosion resistance
A newly developed epoxy-based superhydrophobic coating with an embedded double-layer structure increases bonding strength by 33 % compared with silane-based systems and provides over thirty days of corrosion protection in salt spray environments.
Superhydrophobic coatings are well known for their corrosion-resistant properties, but in harsh marine environments, the adhesion between coating and substrate often weakens. This study introduces a more robust solution: an epoxy-based superhydrophobic coating constructed with a double-layer embedded architecture.
A multi-step spraying method was used to deposit fluorinated carbon nanomaterials (F-CNT), enabling the formation of micro–nano papillae structures. These structures generate a stable air cushion between the liquid and the solid interface, significantly reducing the penetration of corrosive species.
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Enhanced adhesion and strong wear resistance
The coating achieves a bonding strength of 30 MPa — an improvement of 33.3 % compared with a silane coupling layer and 66.6 % compared with systems without a bonding layer. The epoxy polymer contributes to strong interfacial adhesion and mechanical stability.
Hydrophobicity was retained after five hundred abrasion cycles and three hundred and fifty tape-peel tests. The coating also maintained corrosion resistance for more than thirty days in salt spray exposure, demonstrating its suitability for demanding marine environments.
Source: Wang, H. et al., Mechanical durability and corrosion resistance of epoxy based superhydrophobic coating with double-layer embedded structure. Polymer 343, 129467 (2026).
Category: Coatings technologies / Anticorrosion coatings
Matching product (EN): Anticorrosive Coatings
Keywords: superhydrophobic coating, epoxy, micro–nano structures, F-CNT, corrosion resistance, adhesion strength, marine environments
