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Article

Regularities of the Formation of a Green Superhydrophobic Protective Coating on an Aluminum Alloy after Surface Modification with Stearic Acid Solutions

1
Mendeleev University of Chemical Technology of Russia, 125047 Moscow, Russia
2
A.N. Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences, 119071 Moscow, Russia
*
Author to whom correspondence should be addressed.
Academic Editors: Belén Díaz Fernández and Guosong Wu
Metals 2021, 11(11), 1718; https://doi.org/10.3390/met11111718
Received: 18 September 2021 / Revised: 17 October 2021 / Accepted: 23 October 2021 / Published: 27 October 2021
It has been shown that solutions of stearic acid in a dimethyl sulfoxide–water binary mixture allow superhydrophobic protective coatings to be created on an aluminum alloy surface with a minimum impact on the environment. The superhydrophobicity and self-cleaning ability of the coating that we developed have been confirmed by measurements of droplet wetting angles and roll-off angles. These properties appear due to the formation of a multimodal micro-rough surface that mainly consists of aluminum stearate. The coatings formed in this manner have been studied by ellipsometry, XPS, and scanning probe microscopy. Their protective ability has been estimated by the “droplet-express” method and in a salt fog chamber. The protective ability of the coating is determined by the DMSO/H2O ratio, the concentration of stearic acid, and the duration and temperature of modification of the aluminum alloy; it is controlled by a competition between the processes of aluminum stearate formation and hydrolysis. It has been shown that adsorption of stearic acid on an aluminum stearate coating increases its permeability and decreases its protective capability. The results presented in this article are useful for optimizing the conditions of applying green superhydrophobic stearate coatings on aluminum alloys in order to achieve a maximum protective effect. View Full-Text
Keywords: superhydrophobic materials; corrosion protection; protection of aluminum alloys; stearic acid; aluminum passivation superhydrophobic materials; corrosion protection; protection of aluminum alloys; stearic acid; aluminum passivation
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MDPI and ACS Style

Abrashov, A.; Grigoryan, N.; Korshak, Y.; Vagramyan, T.; Grafov, O.; Mezhuev, Y. Regularities of the Formation of a Green Superhydrophobic Protective Coating on an Aluminum Alloy after Surface Modification with Stearic Acid Solutions. Metals 2021, 11, 1718. https://doi.org/10.3390/met11111718

AMA Style

Abrashov A, Grigoryan N, Korshak Y, Vagramyan T, Grafov O, Mezhuev Y. Regularities of the Formation of a Green Superhydrophobic Protective Coating on an Aluminum Alloy after Surface Modification with Stearic Acid Solutions. Metals. 2021; 11(11):1718. https://doi.org/10.3390/met11111718

Chicago/Turabian Style

Abrashov, Aleksey, Nelya Grigoryan, Yuri Korshak, Tigran Vagramyan, Oleg Grafov, and Yaroslav Mezhuev. 2021. "Regularities of the Formation of a Green Superhydrophobic Protective Coating on an Aluminum Alloy after Surface Modification with Stearic Acid Solutions" Metals 11, no. 11: 1718. https://doi.org/10.3390/met11111718

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