Laser Treatment of Aluminum Alloys for Fabrication of Weather-Resistant Superhydrophobic Coatings
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TIONAL AND CONSTRUCTION NANOMATERIALS
Laser Treatment of Aluminum Alloys for Fabrication of Weather-Resistant Superhydrophobic Coatings N. E. Sataevaa,*, K. A. Emelyanenkoa, A. G. Domantovskya, A. M. Emelyanenkoa, and L. B. Boinovicha a
Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, Russia *e-mail: [email protected] Received March 18, 2020; revised April 3, 2020; accepted April 3, 2020
Abstract—In recent years, the use of laser nanotechnology has led to numerous breakthrough results in materials science for creating multifunctional coatings. In this work, based on the application of laser methods for processing the surface of an aluminum alloy, multifunctional coatings with hierarchical roughness combining micro- and nanotexture are obtained. It was shown that, after chemisorption of fluorosilanes, the developed coatings possess superhydrophobic properties that persist under various mechanical loads and UV irradiation. It was found that, after long-term structure-damaging effects, coatings are characterized by self-healing. Owing to detailed selection of the modes of interaction of the laser beam with the material, it was possible to increase significantly the rate of coating production without compromising the functional properties. DOI: 10.1134/S1995078020020172
INTRODUCTION The technological application of aluminum–magnesium alloys in various fields is constantly growing. Currently, such alloys are actively used in the chemical industry for manufacturing pressure vessels and in the production of water condensers, heat exchangers, water coolers, and freezers. Moreover, under operating conditions, they are subjected to intense abrasion, corrosion, scaling, oil, deposits of salts and resins, oxidation, etc. Therefore, it is necessary to give the surfaces of materials additional functional properties that allow them to withstand the action of the factors noted above. One of the promising ways to increase the service life of materials based on aluminum alloys is to give their surfaces superhydrophobic properties. Superhydrophobicity can significantly improve corrosion resistance [1–5], fouling [6–9], and scale deposits [10] and reduce the hydrodynamic resistance to flow [11, 12]. However, the main disadvantages of superhydrophobic coatings are associated, as a rule, with low wear resistance [13] and poor chemical stability [14] of the layer of a hydrophobic agent on top of textured layers. In [4, 15] it is shown that laser nanotechnology can solve the problem of the durability of superhydrophobic coatings. Thus, a combination of laser chemical modification with laser texturing and subsequent chemisorption of a fluorinated hydrophobic agent is a promising way to increase abrasive wear resistance while at the same time providing good chemical resistance of coatings under various operating conditions. In this study laser methods were used to create nano-
and microtextured coatings on the surface of aluminum alloys. It is shown that appropriate selection of the
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