Anticorrosion Superhydrophobic Surfaces on AA6082 Aluminum Alloy by HF/HCl Texturing and Self-Assembling of Silane Monolayer

Abstract

In this paper, the tailoring of superhydrophobic surfaces on AA6082 aluminum alloy by chemical etching in an HF/HCl solution, followed by silane self-assembling, was applied for enhanced corrosion protection in the marine field. In particular, different etching times were considered in order to optimize the treatment effect. The results indicate that all the prepared surfaces, after silanization, were characterized by superhydrophobic behavior with a contact angle higher than 150°. The contact and sliding angles strongly depend on the surface morphology at varying etching times. The optimum was observed with an etching time of 20 s, where a microscale coral-like structure coupled with a homogeneous and ordered pixel-like nanostructure was obtained on the aluminum surface showing a Cassie–Baxter superhydrophobic behavior with a water contact angle of 180° and a sliding angle equal to 0°. All superhydrophobic surfaces achieved an enhanced corrosion protection efficiency and impedance modulus up to two orders of magnitude higher than the as-received AA6082 in simulated seawater.

Study on the Difference of Superhydrophobic Characteristics of Different Wood Furniture Substrates

“…The anti-corrosion properties of the superhydrophobic surface can be attributed to the formation of a composite interface between the micro–nano rough structure of the surface and air and water, thereby reducing contact between the interface and the wood surface [ 34 ]. However, prolonged immersion in an acidic solution can lead to the corrosion of the composite interface by corrosive ions such as Cl − , thereby damaging the interface to a certain extent [ 35 ]. Consequently, silica particles fall off and substances with low surface energy are decomposed, which negatively affects the hydrophobic effect of the modified wood.…”

Superhydrophobic and oleophobic microtextured aluminum surface with long durability under corrosive environment

“…Thanks to the tailoring of specific surface roughness (micro-nanotexturing), the hydrophobicity of a surface with low interfacial energy can be further increased (Cassie-Baxter to Wenzel state), leading to superhydrophobicity. Different methods are reported in the literature to tailor the surface roughness such as mechanical processing 7 , chemical etching 8 – 10 , electrochemical processing 11 , laser texturing 12 or anodizing 13 . However, the implementation of some of them at an industrial level is challenging due to relatively high processing times and costs or difficulty to treat non-flat pieces or complex geometries.…”

Preparation and Characterization of Modified ZrO2/SiO2/Silicone-Modified Acrylic Emulsion Superhydrophobic Coating

“…Different methodologies, such as etching [10][11][12], templating [13][14][15], sol-gel [16][17][18], spray coating [19][20][21], spin coating [22][23][24], and electrospinning [25][26][27], have been investigated to develop superhydrophobic coatings. Among the materials employed, nanoparticles are favored for their inherent hardness and distinct micro-nanostructures, which have proven pivotal in generating superhydrophobic surfaces.…”