Method for preparing zinc alloy super-hydrophobic and self-cleaning surface by using ultra-short pulse laser

Abstract

The present invention relates to a method for preparing a zinc alloy super-hydrophobic and self-cleaning surface by using ultra-short pulse laser, and belongs to the technical field of metal substrate surface modification. According to the method, a zinc alloy sample is subjected to polishing pretreatment, the sample surface is washed respectively with deionized water and dehydrated alcohol, blow drying or air drying is performed, a laser processing technology is utilized, ultra-short pulse laser is used to adjust the relevant process parameters, the sample is subjected to a surface treatment, countless micro structures are processed on the sample surface, and after completing the processing, the processed sample is placed into an electric heating drying box to bake so as to obtain the zinc alloy super-hydrophobic surface having the micron-scale granular or papillary structure, wherein the surface has characteristics of self-cleaning function, excellent friction resistance, and excellent corrosion resistance. The preparation method of the present invention has characteristics of simple process, convenient operation, high efficiency, low energy consumption, low cost, green environmental protection, and easy industrial application achieving.

Description

Technical field: [0001] The invention belongs to the surface modification technology of metal materials, and relates to a method for preparing a bionic superhydrophobic self-cleaning surface on a zinc alloy substrate. More specifically, the invention relates to a method for preparing a zinc alloy superhydrophobic self-cleaning surface by using an ultrashort pulse laser . Background technique: [0002] After hundreds of millions of years of evolution of the survival of the fittest, the organisms in nature have optimized various shapes, configurations, structures and materials, exhibited a variety of functional characteristics, and become a system with the best adaptability and high coordination to the living environment. The mysteries contained in the creatures in nature attract human beings to continuously explore, learn and imitate, in order to solve various problems encountered in human production and life, and make human society move towards a higher direction and deeper ...

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Problems solved by technology

The patent with the application number 201310079939.7 discloses a preparation method of an aluminum alloy biomimetic superhydrophobic surface. First, the aluminum alloy is cleaned with absolute ethanol, and then laser processing is performed on the aluminum alloy surface to process countless microscale craters on the surface of the sample. structure, and then immerse the sample in a chemical etching solution to change the morphology of the sample surface. However, this method does not completely break through the traditional chemical etching surface treatment process. After the laser processing process, chemical etching is further used. , and put the chemically etched aluminum alloy sample into a toluene solution containing DTS for modification, and gradually form a low surface energy film on its surface. The treatment process is complicated, and toluene, a highly toxic carcinogen, is easily cause environmental pollution

The patent with the application number 201410657627.4 discloses a super-hydrophobic high-adhesion metal surface and its preparation method. A periodic micro-nano structure with a rose-like surface microstructure is prepared on the metal surface by high-power picosecond or femtosecond laser, and then passed The surface modification of low-free-energy substances realizes the preparation of super-hydrophobic and high-adhesion metal surfaces. This method uses low-surface-energy substances to modify the surface necessary, and the processing efficiency is low; the patent application number 200910183588.8 discloses a bionic metal Super-wetting cross-scale structure design method and preparation method. This method is designed through complex super-hydrophilic theory. The sample to be treated is placed in a high-vacuum chamber and scanned twice at different angles, and finally a surface close to the natural biological surface is obtained. The cross-scale microstructure of the morphology, but this method needs to strictly control various process parameters, the processing cost is too high, and it is completely unsuitable for industrial mass production

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