Robust Self‐Cleaning and Marine Anticorrosion Super‐Hydrophobic Co–Ni/CeO₂ Composite Coatings

Abstract

Until now, superhydrophobic materials that are scale-up fabrication and application to harsh environments remain challenging because of their fragile mechanical durability. Because of their unique electronic structure, rare-earth oxides (REOs) have been proven to be intrinsically hydrophobic. Herein, cerium oxide particles (CeO 2) are added to the coating by coelectrodeposition. The Co-Ni/CeO 2 composite coating from the electrolyte containing 3.44 g L À1 possesses a flower-like hierarchical structure, displaying a superhydrophobic behavior after the modification by 1H,1H,2H,2H-perfluorooctyltrichlorosilane (PFTEOS). More importantly, excellent mechanical durability with critical abrasion distance of 22.5 m is achieved under a 5 kPa fixed normal pressure in the liner abrasion test before the loss of superhydrophobicity. Also, electrochemical measurements demonstrate that the superhydrophobic composite coatings display high corrosion resistance.

Durable Nanofluids‐Infused Hierarchical Surfaces with High Corrosion and Abrasion Resistance

“…[7,23] The uniform Co-Ni solid solution mixed with the second-phase particles is an important method for forming wear-resistant coatings. [4,7,31] Figure 4b shows the full XPS patterns of the modified micronsized SiO 2 particles, modified nanostructured surface, and micro-nano structured surface. Figure 4bI shows a strong signal of C1s, which could be attributed to the modified HDTMS.…”

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Recently, the anti-icing, [1][2][3] self-cleaning, [4,5] and anticorrosion [6][7][8] applications of super-hydrophobic surface inspired by the lotus-leaf have received extensive attention in industry and daily life. [9][10][11][12] However, these functional surfaces rely on the micro/nanostructures to trap air, which causes unavoidable failure of its liquid-repelling performance under conditions of pressure and friction.

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“…This strategy provides an approach for the preparation of longterm stable SLIPS. [30] In our previous work, wear-resistant micro-nano structured surfaces, including Co-Ni surface coatings, [31] Co-Ni/WC surface coatings, and Co-Ni/CeO 2 surface coatings, [4,7] had been prepared by electrodeposition. Homogeneous solid solution Co-Ni-based coatings showed excellent wear resistance in the application of superhydrophobic surfaces.…”

“Anti-Condensation” Aluminum Superhydrophobic Surface by Smaller Nanostructures

“…Along with the condensation proceeds, arrays of visible, glittering, transparent, and adhesive large Wenzel drops (3–5 mm in diameter) cover the SHSs gradually. This seriously limits their applications in sustained dropwise condensation ( Hao et al, 2018 ; Wang et al, 2020 ), water collection ( Zheng et al, 2010 ), anti-icing ( Kreder et al, 2016 ; Caldona et al, 2017 ; Zhu et al, 2020 ), and anti-corrosion ( Xue et al, 2020 ). In some cases, these SHSs even represent a worse performance than general hydrophobic surfaces do such as increasing ice adhesion strength once the ice forms ( Kreder et al, 2016 ; Caldona et al, 2017 ).…”

Robust Hybrid Omniphobic Surface for Stain Resistance

“…To promote mechanical wear, inorganic materials such as carbon nanotube (CNT), , silicon dioxide, − and metal or alloy − were often introduced into the superhydrophobic coating . In addition, robust superhydrophobicity also can be realized by structuring surfaces at two different length scales, with a nanostructure design to provide water repellency and a microstructure design to provide durability. − For the SLIPS material, intermolecular non-covalent interactions such as a π-electron, π-OH, and electrostatic interaction between lubricating liquid molecules and solid surfaces were considered to avoid the loss of lubricating liquid.…”