| Superhydrophobic micro-column array has a very short liquid-solid contact time,which has broad application prospects in the field of anti-freezing rain and anti-icing.However,the existing processing methods of superhydrophobic micro-column array have problems such as low efficiency and high cost.Which Limit the use of superhydrophobic micro-column array.Jet electrochemical machining has the characteristics of good localization,simple process and no residual stress.To overcome the shortcomings of existing processing methods,In this paper,The micro-column array was processed on the stainless steel substrate by Jet electrochemical machining.Combined with super-hydrophobic nanoparticle spraying technology to obtain super-hydrophobic micro-column array.After that,conducted a drop water collision experiment.to verify the effect of the solid-liquid contact time reduction The main work content and research results are as follows:(1)Designed and built the jet electrochemical machining platform,which consist of the fixture of Cathode and anode,a power supply,and an electrolyte circulation system,selected the appropriate electrolyte,under the basic theory of jet electrochemical machining,combined with the related preliminary processing experiments,determine the suitable electrolyte pressure and the space between the cathode and anode,made a preparation for the follows(2)Under the fixed electrolyte pressure and the distance between the cathode and the anode,based on single-factor machining experiments of single-column structures,the influences of machining voltage,the scan velocity of nozzle and the number of reciprocating machining times on the size of micro-column structure were systematically investigated.Multi-column machining experiments under different trajectories were carried out,compared the structural characteristics of the obtained micro-column array,and the reasons for their generation were analyzed.At the same time,made a comparison between jet electrochemical machining and micro milling on process of the same size structure,the results showed that jet electrochemical machining is more suitable in the processing of stainless steel micro-column array.(3)The three parameters current,nozzle scan speed and processing reciprocating times which have the greatest influence on the micro-column structure size were selected,the threefactor and five-level orthogonal experiment was designed and performed to obtain a mathematical model.The variance and significance of the model was tested by Design Expert.After that,the accuracy of the mathematical model was tested by verification experiments.Based on mathematical model we realized quantitative processing of the large area microcolumn array,obtained array structures with other cross-sectional shapes by jet electrochemical machining,the results show that the model is also applicable to the processing of array structures with special cross-sections within a certain range of parameters.(4)Based on the large area micro-column array structure processed by jet electrochemical machining,Never-wet super-hydrophobic nanoparticles was sprayed on the surface to obtain super-hydrophobic micro-column array structure.Droplet bounce experiments on different surface were conducted.The liquid-solid contact time can be reduced compared ordinary superhydrophobic surface. |
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