Superhydrophobic coating based on EP-140 epoxy enamel: a study of mechanical endurance under external actions

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Abstract

In this study, the mechanical durability of a superhydrophobic coating fabricated on the basis of industrial epoxy enamel EP-140 was investigated. To achieve a superhydrophobic state, the applied coating was modified by pulsed laser texturing and fluorosilane chemisorption. The aim of the research was to evaluate the coating’s resistance to various mechanical loads typical for outdoor use: prolonged water contact, exposure to high-speed water jets, abrasive wear from falling sand, and multiple removals of adhesive tape. It was shown that the combined approach used in superhydrophobic treatment not only provides high water repellency but also significant resistance to degradation. Experiments revealed only a slight decrease in wetting characteristics, while the heterogeneous wetting regime was maintained, confirming that the coating retains its functionality even under extreme mechanical impacts. The obtained data indicate the promising application of the developed coating in industries that require a combination of high wear resistance and cost-effectiveness.

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About the authors

E. A. Kuzina

Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences

Email: emelyanenko.kirill@gmail.com
Russian Federation, Bldg. 4, 31, Leninsky Ave., Moscow, 119071

M. A. Teplonogova

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Email: emelyanenko.kirill@gmail.com
Réunion, 31, Leninsky Ave., Moscow, 119071

A. V. Buglak

Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences

Email: emelyanenko.kirill@gmail.com
Russian Federation, Bldg. 4, 31, Leninsky Ave., Moscow, 119071

K. A. Emelyanenko

Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences

Author for correspondence.
Email: emelyanenko.kirill@gmail.com
Russian Federation, Bldg. 4, 31, Leninsky Ave., Moscow, 119071

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Supplementary files

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2. Fig. 1

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3. Fig. 1. SEM images of freshly prepared superhydrophobic enamel surface at different magnifications.

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4. Fig. 2. Photographs of liquid droplets with different surface tensions on superhydrophobic enamel.

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5. Fig. 3. (a) Evolution of wetting and rolling angles during exposure in a water jet; (b) evolution of wetting angle and surface tension during contact with a water drop.

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6. Fig. 4. Evolution of wetting and rolling angles under the action of abrasion cycles of falling sand.

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7. Fig. 5. Evolution of wetting and rolling angles under the action of adhesive tape tear-off cycles.

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8. Fig. 6. 3D topographic images of the superhydrophobic enamel surface before (a) and after (b) the adhesive tape tear-off test obtained on a confocal microscope.

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