A method for preparing superhydrophobic corrosion-resistant surface of cast iron by using short pulse laser

Abstract

The invention relates to a method for preparing a cast iron super-hydrophobic corrosion-resistant surface with short pulse laser light, and belongs to the technical field of metal substrate surface modification. The method comprises the following steps: performing polishing pretreatment on a cast iron sample; cleaning the surface of the sample with deionized water and absolute ethyl alcohol respectively, drying in a blowing way or drying in the air; regulating relevant process parameters with short pulse laser light, and performing surface treatment on the sample; processing a plurality of microstructures on the surface of the sample; after the completion of processing, putting the processed sample into an electric heating drying oven for baking to obtain the cast iron super-hydrophobic corrosion-resistant surface. The surface is of a micron-sized strip-shaped structure, and has very high super-hydrophobic performance and excellent corrosion resistance. The preparation method has the advantages of simple process, convenience in operation, high efficiency, low energy consumption, low cost, environmental friendliness and easiness in implementation of industrial application.

Description

[0001] Technical field: [0002] The invention belongs to the surface modification technology of metal materials, and relates to a method for preparing a superhydrophobic corrosion-resistant surface on a cast iron substrate. More specifically, the invention relates to a method for preparing a superhydrophobic corrosion-resistant surface of cast iron by using a short pulse laser. [0003] Background technique: [0004] Nature provides us with a large number of examples of superhydrophobic, self-cleaning animal and plant surfaces, such as surfaces such as lotus leaves, rice leaves, watermark legs, moth wings, and bird feathers. The organisms in nature have evolved various shapes, functions, structures and surfaces of materials through hundreds of millions of evolutions to adapt to the environment in which they live. The surface of this structure has the functions of superhydrophobic non-wetting, self-cleaning, and anti-adhesion. In addition, it also has the functions of stealth, ...

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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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