A General Strategy towards Superhydrophobic Self-Cleaning and Anti-Corrosion Metallic Surfaces: An Example with Aluminum Alloy

Zheng, Shunli; Cheng, Li; Zhang, Yupeng; Xiang, Tengfei; Cao, Chris Ying; Li, Quanli; Zhong, Chongli

doi:10.3390/coatings11070788

Cited by 20 publications

(10 citation statements)

References 69 publications

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“…Corrosion tests of AMg6 alloy with a hydrophobized surface in the salt fog chamber showed that the coating that we developed withstood 140 h until the first corrosion sites appeared on the substrate, while the natural oxide film provided protection for only 24 h (Figure 3). Thus, the protective ability of the hydrophobic coating formed is comparable to that achieved by applying chromate coatings (130-150 h) or anodic oxide coatings (96-120 h) [29,30,38,49].…”

Section: Resultsmentioning

confidence: 78%

“…However, superhydrophobization requires a surface with multimodal roughness to be formed beforehand to enable the transition from the Wenzel state to the Cassie state, followed by modification with agents that reduce surface energy [3,[24][25][26][27][28]. Anodizing [29,30], chemical vapor deposition [6,8], sol-gel technology [31][32][33], and laser treatment [34,35] are used to impart multimodal roughness onto a surface. Long-chain alkyl and perfluoroalkyl chains are functionalized with a group that allows them to be affixed to the surface and are used as agents with low surface energy.…”

Section: Introductionmentioning

confidence: 99%

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

Abrashov

Grigoryan

Korshak

et al. 2021

Metals

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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.

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Section: Resultsmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

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

Abrashov

Grigoryan

Korshak

et al. 2021

Metals

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show abstract

“…Generally, metals and alloys are the most suitable substrates for chemical etching, especially magnesium alloys or aluminum alloys (Panda, 2021;Peng et al, 2021). By controlling the concentration of etching solution and etching time, the structural characteristics of superhydrophobic surface, such as roughness, can be effectively changed (Wei et al, 2021b;Guo et al, 2021;Krishnan et al, 2021;Zheng et al, 2021) (Figure 2).…”

Section: Chemical Etching Methodsmentioning

confidence: 99%

Biomimetic superhydrophobic metal/nonmetal surface manufactured by etching methods: A mini review

Ge-Zhang

Yang

et al. 2022

Front. Bioeng. Biotechnol.

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As an emerging fringe science, bionics integrates the understanding of nature, imitation of nature, and surpassing nature in one aspect, and it organically combines the synergistic complementarity of function and structure–function integrated materials which is of great scientific interest. By imitating the microstructure of a natural biological surface, the bionic superhydrophobic surface prepared by human beings has the properties of self-cleaning, anti-icing, water collection, anti-corrosion and oil–water separation, and the preparation research methods are increasing. The preparation methods of superhydrophobic surface include vapor deposition, etching modification, sol–gel, template, electrostatic spinning, and electrostatic spraying, which can be applied to fields such as medical care, military industry, ship industry, and textile. The etching modification method can directly modify the substrate, so there is no need to worry about the adhesion between the coating and the substrate. The most obvious advantage of this method is that the obtained superhydrophobic surface is integrated with the substrate and has good stability and corrosion resistance. In this article, the different preparation methods of bionic superhydrophobic materials were summarized, especially the etching modification methods, we discussed the detailed classification, advantages, and disadvantages of these methods, and the future development direction of the field was prospected.

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“…Among these approaches, chemical etching has been highlighted on account of its low cost and high efficiency. Furthermore, several kinds of chemicals, including acid [12][13][14][43][44][45][46][47][48][49]52,53], salt [50,51] and alkali [15,[54][55][56][57][58][59][60][61][62][63][64] solutions, have been widely used as etchants. Among these etchants, alkali solution is preferable because it is more beneficial for the environment.…”

Section: Introductionmentioning

confidence: 99%

A Novel Simple Fabrication Method for Mechanically Robust Superhydrophobic 2024 Aluminum Alloy Surfaces

et al. 2022

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The mechanical durability of a superhydrophobic aluminum alloy surface is an important indicator of its practical use. Herein, we propose a strategy to prepare a superhydrophobic 2024 aluminum alloy surface with highly enhanced mechanical durability by using a two-step chemical etching method, using a NaOH solution as the etchant in step one and a Na2CO3 solution as the etchant in step two. Robust mechanical durability was studied by static contact angle tests before and after an abrasion test, potentiodynamic polarization measurements after an abrasion test and electrochemical impedance spectroscopy tests after an abrasion test. Furthermore, the mechanism for enhanced mechanical durability was investigated through scanning of electron microscopy images, energy-dispersive X-ray spectra, Fourier transform infrared spectra and X-ray photoelectron spectra. The testing results indicate that a hierarchical rough surface consisting of regular micro-scale dents and some nano-scale fibers in the micro-scale dents, obtained with the two-step chemical etching method, contributes to highly enhanced mechanical durability. Meanwhile, the as-prepared superhydrophobic 2024 aluminum alloy surface retained a silvery color instead of the black shown on the superhydrophobic 2024 aluminum alloy surface prepared by a conventional one-step chemical etching method using NaOH solution as the etchant.

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A General Strategy towards Superhydrophobic Self-Cleaning and Anti-Corrosion Metallic Surfaces: An Example with Aluminum Alloy

Cited by 20 publications

References 69 publications

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

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

Biomimetic superhydrophobic metal/nonmetal surface manufactured by etching methods: A mini review

A Novel Simple Fabrication Method for Mechanically Robust Superhydrophobic 2024 Aluminum Alloy Surfaces

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