Anti-corrosion effectiveness of superhydrophobic coatings on metals. Overview

• L.E. Tsygankova¹ and M. Vigdorowitsch^2,3

¹ Derzhavin State University, Internatsyonalnaya str. 33, 392000 Tambov, Russian Federation
² Angara GmbH, Mörsenbroicher Weg 191, 40470 Düsseldorf, Germany
³ All-Russian Scientific Research Institute for the Use of Machinery and Oil Products in Agriculture, Novo-Rubezhnyi sidestr. 28, 392022 Tambov, Russian Federation

Abstract: In the past two decades, fabrication of hydrophobic and superhydrophobic coatings on metals and practical application of those for self-cleaning, anti-icing, oil-water separation and especially anti-corrosion purposes has been intensively discussed in the research community. This review addresses metals and their relevant protection against corrosion under various conditions (in water, in chloride solutions, in atmosphere with aggressive components) through superhydrophobic materials and methods of fabrication of these. Under consideration are both technologically more advanced methods based on laser texturing of a metal surface or plasma etching to create multimodal roughness, followed by deposition of a layer of substance with low surface energy, primarily fluoroxysilanes, and also simpler, ordinarily environmentally friendly and less expensive approaches based on chemical etching of the metal surface, chemical or electrochemical deposition of metals of the same or different nature, followed by treatment with hydrophobising agents such as myristic or stearic acids. Studies of anti-corrosion properties of coatings were carried out predominantly by methods of electrochemical polarisation and electrochemical impedance spectroscopy and, in rare cases, by direct corrosion tests. This review mainly focuses on protection of iron, steels, copper, zinc, aluminium and magnesium.

Keywords: superhydrophobisation, metals, corrosion protection, multimodal roughness, wetting, potentiodynamic polarisation, electrochemical impedance spectroscopy

Int. J. Corros. Scale Inhib., 2022, 11, no. 3, 889-940
doi: 10.17675/2305-6894-2022-11-3-2

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