Superhydrophobic Coatings for Corrosion and Tribology

Shuncai Wang ,Guochen Zhao

doi:10.3390/books978-3-03921-785-4

Abstract

Superhydrophobic surfaces, with a water contact angle >150°, have attracted both academic and industrial interest due to their wide range of applications, such as water proofing, anti-fogging, antifouling, anti-icing, fluidic drag reduction and anti-corrosion. Currently the majority of superhydrophobic coatings are created using organic chemicals with low surface energy. However, the lack of mechanical strength and heat resistance prevents the use of these coatings in harsh environments. Quality superhydrophobic coatings developed using inorganic materials are therefore highly sought after. Ceramics are of particular interest due to their high mechanical strength, heat and corrosion resistance. Such superhydrophobic coatings have recently been successfully fabricated using a variety of ceramics and different approaches, and have shown the improved wear and tribocorrosion resistance properties. This Special Issue focuses on the recent developments in the fabrication of superhydrophobic coatings and their robustness against corrosion and wear resistance, but the original work on other properties of superhydrophobic coatings are also welcome. In particular, the topics of interest include, but are not limited to: Robust superhydrophobic coatings; Coatings with super-wettability in multifunctional applications; Wetting effects on corrosion and tribology; Hierarchical Coating for wetting and modelling.

Highlights

Superhydrophobicity, showing strong water-repellency, has been widely investigated for many applications, especially in the fields of corrosion protection and antifouling
The delay in electrodeposition is in agreement with results in Ni–Co/C nanotubes reported by Liu et al [21], and can be attributed to the hindrance effect of WS2 particles adsorbed on the electrode surface
In order to further observe the surface microstructure of the copper meshes, since the microscope could only roughly see the differences in surface morphology of the copper meshes, the copper meshes were characterized by scanning electron microscopy (SEM)

Summary

Introduction

Superhydrophobicity, showing strong water-repellency, has been widely investigated for many applications, especially in the fields of corrosion protection and antifouling. Water tends to roll off from superhydrophobic surfaces like natural lotus leaves. When a corrosive aqueous solution comes into contact with such a surface, a stable air cushion is formed on the interface between liquid and solid which minimizes the contact area. The charge transfer of the corrosive reaction is dramatically restrained, resulting in a positively shifted corrosion potential and low corrosion rate. The superhydrophobic surface effectively isolates microorganisms from adhering on the surface and prevents microbiologically influenced corrosion caused by their metabolites. The superhydrophobic coatings have potential applications in corrosion protection of marine equipment, medical devices, mechanical components, etc

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