Superamphiphobic aluminum alloy with low sliding angles and acid-alkali liquids repellency

Zhang, Binbin; Zeng, Yuxiang; Wang, Jia; Sun, Yuanyuan; Zhang, Jie; Li, Yantao

doi:10.1016/j.matdes.2020.108479

Cited by 35 publications

(27 citation statements)

References 54 publications

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“…After all steps were applied, the resulting surfaces exhibited micro-nano scale topography (Figure 6ii) and repelled liquids with surface tension down to 27.5 mN•m −1 . In addition, stability against liquids with pH values ranging from 1 to 14 was also observed and the superhydrophobic properties were retained after 20 self-cleaning tests [60].…”

Section: Combination Of Wet Etching and Synthesis Methodsmentioning

confidence: 91%

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A Review of Fabrication Methods, Properties and Applications of Superhydrophobic Metals

et al. 2021

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Hydrophobicity and superhydrophobicity with self-cleaning properties are well-known characteristics of several natural surfaces, such as the leaves of the sacred lotus plant (Nelumbo nucifera). To achieve a superhydrophobic state, micro- and nanometer scale topography should be realized on a low surface energy material, or a low surface energy coating should be deposited on top of the micro-nano topography if the material is inherently hydrophilic. Tailoring the surface chemistry and topography to control the wetting properties between extreme wetting states enables a palette of functionalities, such as self-cleaning, antifogging, anti-biofouling etc. A variety of surface topographies have been realized in polymers, ceramics, and metals. Metallic surfaces are particularly important in several engineering applications (e.g., naval, aircrafts, buildings, automobile) and their transformation to superhydrophobic can provide additional functionalities, such as corrosion protection, drag reduction, and anti-icing properties. This review paper focuses on the recent advances on superhydrophobic metals and alloys which can be applicable in real life applications and aims to provide an overview of the most promising methods to achieve sustainable superhydrophobicity.

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Section: Combination Of Wet Etching and Synthesis Methodsmentioning

confidence: 91%

“…(ii) SEM images of superamphiphobic HCl-H 2 O-POTS AA5083. Reproduced with permission from [60]. (iii) Fabrication process of different wettability patterns on the same surface.…”

Section: Combination Of Wet Etching and Synthesis Methodsmentioning

confidence: 99%

A Review of Fabrication Methods, Properties and Applications of Superhydrophobic Metals

et al. 2021

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“…Thus, Al at the surface of the AA6082 transforms into Al 2 O 3 .χH 2 O. This latter reacts with H 2 O to generate an AlO(OH) crystal called boehmite, resulting in the flower-like rough structure [6,12,26,27].…”

Section: Surface Morphology and Roughnessmentioning

confidence: 99%

“…Small peaks of carbon and oxygen were also evidenced, due to contamination. However, the spectra of the treated surfaces reveal a great increase in the percentages of C and O, indicating that a silane layer was successfully grafted on the rough aluminum substrate [26,36]. Figure 4 shows FTIR spectra of A-WS.…”

Section: Element Analysismentioning

confidence: 99%

Superhydrophobic Self-Assembled Silane Monolayers on Hierarchical 6082 Aluminum Alloy for Anti-Corrosion Applications

2020

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In this work, a two-stage methodology to design super-hydrophobic surfaces was proposed. The first step consists of creating a rough nano/micro-structure and the second step consists of reducing the surface energy using octadecyltrimethoxysilane. The surface roughening was realized by three different short-term pretreatments: (i) Boiling water, (ii) HNO3/HCl etching, or (iii) HF/HCl etching. Then, the surface energy was reduced by dip-coating in diluted solution of octadecyltrimethoxysilane to allow the formation of self-assembled silane monolayers on a 6082-T6 aluminum alloy surface. Super-hydrophobic aluminum surfaces were investigated by SEM-EDS, FTIR, profilometry, and contact and sliding angles measurements. The resulting surface morphologies by the three approaches were structured by a dual hierarchical nano/micro-roughness. The surface wettability varied with the applied roughening pretreatment. In particular, an extremely high water contact angle (around 180°) and low sliding angle (0°) were evidenced for the HF/HCl-etched silanized surface. The results of electrochemical tests demonstrate a remarkable enhancement of the aluminum alloy corrosion resistance through the proposed superhydrophobic surface modifications. Thus, the obtained results evidenced that the anti-wetting behavior of the aluminum surface can be optimized by coupling an appropriate roughening pretreatment with a self-assembled silane monolayer deposition (to reduce surface energy) for anticorrosion application.

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“…Compared to the water contact angles of the uncoated samples, the contact angles almost doubled after the application of the coating. Multiscale roughness was created due to the agglomeration of the coating particles ( Figure 10) which favoured the high contact angles [34,35]. Thus, a porous structure with a round, hilly surface was formed as shown in Figure 9e.…”

Section: Coated Samplesmentioning

confidence: 99%

Static Wettability of Differently Mechanically Treated and Amphiphobic-Coated Aluminium Surfaces

et al. 2020

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Wettability, roughness and surface treatment methods are essential for the majority of practical applications, where liquid–solid surface interactions take place. The present study experimentally investigated the influence of different mechanical surface treatment methods on the static wettability of uncoated and amphiphobic-coated aluminium alloy (AlMg3) samples, specially focusing on the interaction between surface finishing and coating. Five different surfaces were prepared: as-received substrate, polished, sandpapered, fleece-abraded and sandblasted. After characterisation, the samples were spray-coated using an amphiphobic coating. The characterisation of the uncoated and coated samples involved measurements of the roughness parameters and the apparent contact angles of demineralized water and rapeseed oil. The coating was initially characterised regarding its adhesion to the sample and elevated temperature stability. The applied surface treatments resulted in the scattered sample roughness in the range of Sa = 0.3–15.8 µm, water contact angles of θ a p , w = 78°–106° and extremely low oil contact angles. Coating the samples more than doubled the surface roughness to Sa = 13.3–29 µm, whereas the initial surface treatment properties (structure, anisotropy, etc.) were entirely repressed by the coating properties. Coating led the water contact angles to increase to θ a p , w _ c o a t e d = 162°–173° and even more pronounced oil contact angles to increase to θ a p , o _ c o a t e d = 139°–150°, classifying the surfaces as superhydrophobic and oleophobic.

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Superamphiphobic aluminum alloy with low sliding angles and acid-alkali liquids repellency

Cited by 35 publications

References 54 publications

A Review of Fabrication Methods, Properties and Applications of Superhydrophobic Metals

A Review of Fabrication Methods, Properties and Applications of Superhydrophobic Metals

Superhydrophobic Self-Assembled Silane Monolayers on Hierarchical 6082 Aluminum Alloy for Anti-Corrosion Applications

Static Wettability of Differently Mechanically Treated and Amphiphobic-Coated Aluminium Surfaces

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