Regularities of the Formation of a Green Superhydrophobic Protective Coating on an Aluminum Alloy after Surface Modification with Stearic Acid Solutions
| Autor: | Oleg Grafov, Yaroslav Mezhuev, A. A. Abrashov, N. S. Grigoryan, Tigran Vagramyan, Yuri V. Korshak |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
superhydrophobic materials
Materials science Mining engineering. Metallurgy aluminum passivation Alloy Aluminum Stearate Metals and Alloys TN1-997 technology industry and agriculture corrosion protection stearic acid engineering.material complex mixtures chemistry.chemical_compound Adsorption chemistry Coating Chemical engineering Stearate protection of aluminum alloys engineering Surface modification General Materials Science Stearic acid Wetting |
| Zdroj: | Metals Volume 11 Issue 11 Metals, Vol 11, Iss 1718, p 1718 (2021) |
| ISSN: | 2075-4701 |
| DOI: | 10.3390/met11111718 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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