Background: Preparation of the superhydrophobic surface on the metal substrate can effectively solve the problems of easy corrosion and easy ice coating of metal materials, and it is given the functions of self-cleaning, oil-water separation, lubrication and drag reduction. Constructing micro-nano rough structures and reducing surface potential energy are the keys to the preparation of superhydrophobic surfaces. There is no macroscopic cutting force between the electrode and workpiece in the WEDM process, the surface roughness can be changed by controlling the energy, and the complex shape can be manufactured by increasing the degree of freedom. The WEDM method has broad application prospects in the preparation of the superhydrophobic surface. Objective: To verify the feasibility of preparing the hydrophobic surface by WEDM, the micro-nano structure of the EN-GJL-250 (Gray cast iron material) surface was processed by the WEDM method, and the effect of surface roughness on the hydrophobicity of the surface was studied; Simultaneously,in the process of WEDM, the effects of peak current and pulse width on the surface roughness and static contact angle (CAs) of the EN-GJL-250 are studied,The purpose is to improve and control the surface hydrophobicity of the EN-GJL-250. Methods: The micro-nano structure was fabricated on the EN-GJL-250 surface by WEDM. Using the single factor test, by setting different peak currents and pulse widths, the surface roughness and CAs of the processed EN-GJL-250 can be measured. Results: Using the WEDM machine tool, by inputting set dimensions and regular contour parameters, the micro-nano structure with hydrophobic properties can be machined on the EN-GJL-250 surface. Different WEDM processing parameters produce rough microstructures of different scales and affect the hydrophobicity of the EN-GJL-250 surface. Experimental results show: With the increase of pulse width and peak current, the surface roughness of EN-GJL-250 also increases, and the number and size of craters in the microstructure increase, which improves the hydrophobicity of the surface of EN-GJL-250; When the peak current is 16A and the pulse width is 32us, the CAs of the prepared EN-GJL-250 surface is the highest. Conclusion: The surface roughness microstructure of EN-GJL-250 is processed by WEDM, which can realize the hydrophobicity of the surface. The pulse width and peak current will affect the roughness of the processed surface, thereby affecting the hydrophobic properties of the surface. The research data in this paper provides theoretical support for the industrial production of superhydrophobic EN-GJL-250 surfaces.
Background: Superhydrophobic surfaces have unique wettability and have shown broad application prospects in many fields, such as self-cleaning and lubrication drag reduction. However, the superhydrophobic surfaces are severely restricted by their poor mechanical stability in practical application, and the mechanical stability of the superhydrophobic surface is always affected by different preparation methods. Therefore, people pay more attention to the preparation methods of superhydrophobic surfaces. Objective: The study aims to improve the mechanical stability of the superhydrophobic surface and expand the application fields of the superhydrophobic surfaces; preparation methods of the superhydrophobic surface have been continuously improved. Methods: This paper reviews various representative patents and papers on preparation methods of the superhydrophobic surface at home and abroad. Results: In this review, the basic methods of preparing superhydrophobic surfaces were introduced, and three typical methods were summarized, such as etching method, coating method, and sol-gel method, then their advantages and disadvantages were discussed. In combination with the latest research progress, it is proposed that the use of environmentally friendly low surface energy modifiers and the use of the one-step method to prepare superhydrophobic surfaces are the future development trends. Aiming at the problem of the mechanical stability of superhydrophobic surfaces, the instability mechanism and stability evaluation methods of superhydrophobic surfaces under mechanical action are reviewed, and three basic methods to improve the mechanical stability of superhydrophobic surfaces are proposed. Conclusion: The optimization of the preparation method of the superhydrophobic surface is beneficial to improve the mechanical stability of the superhydrophobic surface and expand the application prospect of the superhydrophobic surfaces in various fields. More patents and papers on the superhydrophobic surface will be invented later.
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