A kind of preparation method of superhydrophobic aluminum and aluminum alloy surface

Abstract

The invention relates to a preparation method of a super-hydrophobic aluminum or aluminum alloy surface. The preparation method comprises the following steps: (1) washing, namely washing aluminum or aluminum alloy by acetone and ethanol in sequence under normal temperature and normal pressure to remove oil stains from the surface so as to obtain clean aluminum or aluminum alloy; (2) roughening the surface, namely processing the clean aluminum or aluminum alloy in a water solution containing sodium metaaluminate and urea to roughen the aluminum or aluminum alloy surface; (3) hydrophobizing, namely performing chemical vapor deposition on the aluminum or aluminum alloy processed in the step (2) at 120-150 DEG C, and modifying the aluminum or aluminum alloy surface with a hydrophobic compound to obtain the super-hydrophobic aluminum or aluminum alloy surface. According to the method, the used process is simple, the operation is convenient, and the industrialization is easy to realize; the surfaces of aluminum or aluminum alloy parts with special or complex shapes can be subjected to super-hydrophobic modification in large area; the surface contact angle of an obtained coating is more than 150 degrees; the application prospect is wide.

Description

technical field [0001] The invention belongs to the field of preparation of hydrophobic materials, in particular to a method for preparing superhydrophobic aluminum and aluminum alloy surfaces. Background technique [0002] Superhydrophobic surfaces are produced in the long-term evolution of natural organisms, and the surfaces of many animals and plants (such as lotus leaves, rice leaves, cicada wings and water strider legs) have superhydrophobic and self-cleaning effects. Superhydrophobic surfaces generally refer to surfaces with a static contact angle greater than 150° with water, which have the characteristics of superhydrophobicity, self-cleaning and anti-corrosion, making them have great application potential in industrial and agricultural production. The application of superhydrophobic surface technology to metal materials can achieve the effects of self-cleaning, inhibiting surface corrosion and surface oxidation, reducing the friction coefficient and enhancing frost ...

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Problems solved by technology

In terms of patents, for example, Liang Shuquan et al. used chemical etching in "Preparation Method for Constructing Superhydrophobic Structure on Aluminum Alloy Surface" (application number CN201110007252.3), and used oxalic acid and hydrochloric acid to etch the surface of aluminum alloy to construct a rough structure. , and then use stearic acid for surface modification to prepare superhydrophobic surface of aluminum alloy. The preparation process is simple and does not require any expensive equipment and complicated chemical treatment process, but the quality of chemical etching is not easy to control

The preparation method mentioned in "A Preparation Method of Super-hydrophobic Protective Film on the Surface of High-Strength Aluminum Alloy" (application CN201210314685.8) by Lei Jinglei et al. uses a rare earth nitrate aqueous solution to construct a micro / nano-rough rare earth oxidation film on the surface of a high-strength aluminum alloy. membrane, and then use the hydrophobic treatment solution of dodecafluoroheptylpropyltrimethoxysilane and absolute ethanol to modify the surface of the membrane, which also divides the preparation process into two steps, and the raw materials are not easy to obtain, the price is expensive, and there is a cost high problem

The chemical etching method described in "A Preparation Method of Aluminum Alloy Biomimetic Superhydrophobic Surface" (Application No. CN201310079939.7) by Liu Yan et al. firstly performs laser processing on the aluminum alloy surface to obtain numerous microscale crater-like structures Then immerse the sample in a chemical etching solution to change the morphology of the sample surface. Finally, put the chemically etched aluminum alloy into a toluene solution containing DTS for modification, and finally obtain a micro The superhydrophobic surface of aluminum alloy with nano-layered double-layer structure, but the preparation process is complicated, the controllability is poor, the efficiency is low, and the comprehensive cost has not been effectively reduced, so it is not suitable for large-scale industrial production and promotion. It is still the focus of people's research on the method of being simple and easy to operate, low in cost, and capable of obtaining superhydrophobic surfaces with excellent properties.

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