Preparation method of multiple super-hydrophobic composite film layers on aluminium alloy surface

Abstract

The invention discloses a preparation method of multiple super-hydrophobic composite film layers on an aluminium alloy surface. According to the method, firstly, micro-arc oxidation treatment is performed on a pretreated aluminium alloy sample, and a porous micro-arc oxidation ceramic layer with the micron-scale surface roughness is obtained; the obtained ceramic layer is arranged in a mixed solution to have a hydrothermal reaction, hydrotalcite films are generated on the surface and inner walls of holes of the ceramic layer, and composite film layers adopting micron / nano binary coarse structures are constructed; low-surface-energy modification is performed on the composite film layers with stearic acid, and the multiple super-hydrophobic composite film layers are formed on the aluminium alloy surface finally. With the preparation method, the problems that the construction cost of the micron / nano binary coarse structures is high and the environment is polluted can be solved, and a novel technical means for constructing the micron / nano binary coarse structures on the aluminium alloy surface is provided, so that the multiple super-hydrophobic composite film layers are prepared.

Description

technical field [0001] The invention relates to the technical field of aluminum alloys, in particular to a method for preparing a multilayer super-hydrophobic composite film on the surface of an aluminum alloy. Background technique [0002] At present, aluminum alloy has low density, high specific strength and specific stiffness, and is widely used in aerospace, transportation, electrical furniture and other fields, but its application is also limited due to its corrosion resistance. Surface treatment is carried out to improve its surface properties. Super-hydrophobic materials are widely used in daily life, industrial production and military affairs. Super-hydrophobic materials can reduce friction. For example, in the shipbuilding industry, if the surface of the ship's shell is super-hydrophobic, it can reduce the resistance of the ship to sail, thereby increasing its speed. And reduce fuel consumption. In addition, preparing a superhydrophobic film on the metal surface c...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a multi-layer super-hydrophobic composite film on the surface of an aluminum alloy, which can solve the problems of expensive construction of a micro / nano binary rough structure and pollute the environment, and provide a new A technical method for constructing micro / nano binary rough structures on the surface of aluminum alloys to prepare multi-layer super-hydrophobic composite films

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