Preparation And Protective Properties Study Of Aluminum Alloy Superhydrophobic Films

Metal superhydrophobic surfaces are attracted much attention because of the surface properties of self-cleaning, inhibiting corrosion and oxidation, decreasing friction factor. Currently, Studies of stability about aluminum alloy superhydrophobic surfaces are incomplete, the preparation process is required to simplify and the production cost is needed to reduce, it is difficult to obtained simultaneously with durable microstructure and durable low surface energy materials on superhydrophobic surfaces. The chemical and electrochemical methods are intended to construct rough surfaces on aluminum alloys in the project. They are studied about superhydrophobic stability, the roughness, rough structure, micro-nanostructure arrangement and chemical composition in material surfaces by SEM, IR and other test equipments, in order to obtain optimal model of rough structure on aluminium alloy surface. The optimized structure of aluminum alloy rough surface and the components of coupling agent are studied by contact angle system OCA20, adhesion testing system QFZ-Ⅱ, electrochemical test system IM6 ex. The relationship between the structure, microhardness, density of coating surface and surface hydrophobicity stability are also studied, which is offered theoretical support by building stable superhydrophobic coating. The paper main research contents are as follows:(1) The multiple roughened structures were prepared on aluminum alloy surfaces via acid etching method, anodic oxidation method, phosphoric acid-dichromate method and template method, they are respectively tepladder, acicular, ellipsoid, columnar and triangle. These multiple roughened structures were coated with stearic acid, the adhesion performance of different microstructure on superhydrophobic aluminum alloy surfaces were studied, in order to obtain optimum surface roughened structures.(2) We chose five kinds of polymer materials with low surface free energy, namely PP, SA, PE, PS and LDPE, in the case of the same surface microstructure on the aluminum alloy substrates, the adhesion performance of different surface coating materials of superhydrophobic aluminum alloy surfaces were studied, in order to obtain optimum surface coating materials, and we chose KH550 and nano-Si O2 particles modified aluminum alloy surfaces, to further improve the adhesion performance of the coating and the aluminum alloy substrate.(3) Different surface roughness were prepared on aluminum alloy, in the case of the same surface coating materials on the aluminum alloy substrates, the corrosion resistance and vulnerability of different surface roughness on aluminum alloys were studied. The results show that surface roughness increased can improve the corrosion resistance of aluminum alloy in weak acid, weak alkaline and salt solutions and vulnerability. When the contact angle is greater than 150°, the corrosion resistance and vulnerability of aluminum alloys have been greatly improved.(4) We chose five kinds of polymer materials with low surface free energy, namely PP, SA, PE, PS and LDPE, in the case of the same surface roughness on the aluminum alloy substrates, the corrosion resistance of different surface coating materials on superhydrophobic aluminum alloy surfaces were studied, in order to obtain optimum surface coating materials, and we further modified aluminum alloy surfaces, to further improve the corrosion resistance of superhydrophobic aluminum alloys.