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SCIENTIFIC DEVELOPMENTS OF THE D. MENDELEEV UNIVERSITY OF CHEMICAL TECHNOLOGY OF RUSSIA
ArticleName Environmentally friendly solution of hydrophobization of the 5556 alloy based on stearic acid and dimethyl sulfoxide
DOI 10.17580/tsm.2021.10.05
ArticleAuthor Abrashov A. A., Grigoryan N. S., Tolmachev Ya. V., Serov A. N.
ArticleAuthorData

D. Mendeleev University of Chemical Technology of Russia, Moscow, Russia:

A. A. Abrashov, Associate Professor at the Department of Innovative Materials and Corrosion Protection, Candidate of Technical Sciences, e-mail: abr-aleksey@yandex.ru
N. S. Grigoryan, Professor at the Department of Innovative Materials and Corrosion Protection, Associate Professor, Candidate of Chemical Sciences, e-mail: ngrig108@mail.ru
Ya. V. Tolmachev, Undergraduate Student at the Department of Innovative Materials and Corrosion Protection, e-mail: vetolmyan@gmail.com
A. N. Serov, Assistant Lecturer at the Department of Innovative Materials and Corrosion Protection, Candidate of Chemical Sciences, e-mail: serov@muctr.ru

Abstract

Lately, one of the most sought-after methods of protecting metal surfaces in aggressive environments is the formation of continuous films with water-repellent properties and self-cleaning ability; the so-called superhydrophobic films. In the scientific and technical literature, the term “superhydrophobic” is used to refer to surfaces that possess the contact angle in water and water solutions of no less then 150o, and the water droplet is able to roll of the surface with the tilt angle of no more then 10o. A superhydrophobizing solution for 5556 aluminum alloy surface containing DMSO and water in the ration of 7:1, as well as stearic acid (SA) in the amount of 2–3 g/l has been developed. It has been established that the coating that forms in this solution, is characterized by the contact angle Θc = 151o. The coating’s XPS survey spectra point to the presence of oxygen, aluminum, carbon and hydrogen in the coating. The analysis of the individual spectra of aluminum, oxygen and carbon has shown that oxygen and carbon are present in the form of carboxyl group COO, aluminum is present as Al3+, which is formed by the reaction of stearic acid with the aluminum surface. It has been established that the lightening stage lowers the surface roughness, which negatively effects the hydrophobic surface. The contact angle rises from 140o to 151o if the lightening stage is bypassed.
This research was funded by D. Mendeleev University of Chemical Technology of Russia. Project No.: Х-2020-028.

keywords Corrosion protection, superhydrophobic coatings, organic coatings, surface treatment, stearic acid, aluminum passivation, hydrophobization
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