Preparation of corrosion-resisting superhydrophobic surface on aluminium substrate

Abstract

A superhydrophobic surface with micro-nano rough structure and corrosion-resisting property was prepared on aluminium substrate by a simple one-step wet chemical etching in HCl solution and in situ polymerisation method through thiol-ene coupling. The influence of etching time on wettability and morphology of the aluminium substrate surface was discussed. The surface morphology, chemical compositions and wettability of the aluminium substrate were investigated by scanning electron microscope, energy-dispersive X-ray spectroscopy and Fourier transform infrared. The water contact angle (WCA) and sliding angle (SA) were measured to study the superhydrophobicity. The results showed that a rough and irregular morphology was formed with 3.5 min etching, WCA and SA of the modified aluminium surface were 163°and 5°, respectively. The as-prepared surface revealed excellent corrosion resistance in 3.5% wt NaCl solution. The self-etching current density of the superhydrophobic aluminium surface was only 3.22 × 10 −7 A cm −2 .

Effect of Chemical Surface Texturing on the Superhydrophobic Behavior of Micro–Nano-Roughened AA6082 Surfaces

“…Rezayi et al [ 56 ] produced a superhydrophobic surface on an aluminum substrate via the chemical etching process followed by nano-ZnO and stearic acid coating. Analogously, Varshney et al [ 57 ] proposed a single- or two-step (chemical etching followed by coating) method to obtain a textured superhydrophobic surface Therefore, several studies have investigated that a superhydrophobic surface with micro-nano rough structure is a key point in order to promote specific performances such as corrosion resistance [ 58 , 59 ], water condensation [ 60 ], and self-cleaning [ 61 , 62 , 63 , 64 ].…”

Hydrogen bubble-templated electrodeposition of superhydrophobic Zn–Ni films

“…16–18 It is worth noting that roughness construction is more critical than low surface energy modification. The surface technologies are such effective methods to prepare superhydrophobic films, such as the template method, 19,20 chemical etching, 21–24 plasma etching, 25,26 the tensile method, 27 self-assembly, 28,29 anodizing, 30,31 electrospinning, 32,33 spin films, 34 sol–gel, 35 etc. It is believed that the combination of the micro/nanostructure and low energy modification can improve the hydrophobicity of the surface.…”

Wettability of semispherical droplets on layered elastic gradient soft substrates

“…From then on, scholars have carried out a lot of researches on wetting phenomenon 5 – 14 . It can be seen that this phenomenon is ubiquitous and significantly important, such as oil exploitation, printing and painting 5 , 7 , application of superhydrophobic substrates 8 – 10 and so on. On an enough soft substrate, static droplets will cause significant deformation of the substrate, which is driven by capillary force on the contact line and fluid pressure on the solid surface.…”

“…More importantly, the problems of surface and interface of soft matter have become one of the key areas of interdisciplinary research in physics, chemistry, biology and mathematics, especially the phenomenon of surface wetting.Thomas Young, the pioneer of wetting science research, come up with the idea of contact angle in 1805, so as to characterize the surface wetting stability 4 . From then on, scholars have carried out a lot of researches on wetting phenomenon [5][6][7][8][9][10][11][12][13][14] . It can be seen that this phenomenon is ubiquitous and significantly important, such as oil exploitation, printing and painting 5,7 , application of superhydrophobic substrates 8-10 and so on.…”