Preparation Of Wear-resistant Metal Filter Sieve For Oil/water Separation By Pulse Electrodeposition

Due to the special wettability of superhydrophobic material surfaces,it has a wide range of applications.And oil/water separation is one of its most important applications.However,the materials produced by the current methods have not yet been able to solve the problems of poor durability and short cycle life,which greatly restrict the practical application of superhydrophobic materials.Thus,it becomes a research hotspot.In this thesis,superhydrophobic functional materials with micro-nano structures were fabricated on metal copper mesh or foamed copper materials by one-step or multi-step methods with the help of micro-nano fabrication techniques,such as pulse electrodeposition and chemical oxidation.And the formation mechanism of the material was studied.Besides,low adhesion and static and dynamic behaviors of droplets on the material surface.And its related properties,such as mechanical stability,corrosion resistance and oil/water separation,were measured and analyzed.This study provides a potential method to manufacture a superhydrophobic metal material for oil/water separation.The main research contents and results are as follows:(1)A robust,non-fluorinated superhydrophobic brass mesh wrapped by Cu(OH)₂nanowires was prepared by combining pulsed electrodeposition,simple dip-coating oxidation,and fluorination treatment procedures.Droplet rolling and bouncing performance tests were carried out on the surface of the material surface.Based on the characterization of the surface topography and chemical composition of the material,the internal formation mechanism was analyzed.In addition,other characteristics of the material,such as mechanical stability,chemical stability and oil/water separation,were also explored thoroughly.According to the results,it can be seen that the formation of the superhydrophobic functional surface mainly depends on the rough surface micro-nano structure and the long carbon-chain dodecane sulfide copper material with low surface energy,which is formed by the self-assembly reaction.The related properties and oil/water separation efficiency are mainly affected by the morphology of the micro-nano structures of the surface.And the morphology of samples can be regulated by adjusting the pulsed electrical parameters.The sample prepared by this method has a strong anti-wear performance and oil/water separation efficiency.After 400 cycles of wear test,the oil/water separation efficiency of the sample can still reach more than 98%.(2)A superhydrophobic material with a micro-nano composite low surface energy structure is directly fabricated on the 3D metal foam by one-step pulse electrodeposition technology.And the surface of the material is characterized and analyzed by SEM,EDS,XRD,FTIR and XPS.Based on these results above,the internal formation mechanism is explored.The rolling and bouncing performances of droplet on the machined surface are measured and recorded.Besides,some characteristics of material,such as wear resistance,corrosion resistance,acid and alkali resistance,adsorption and oil-water separation efficiency are comprehensively explored.Results indicate that micro-nano structures with low surface energy can be directly prepared by a simple one-step pulse electrodeposition.And the inner and outer structures on the surface are uniformly distributed.Whether in air(CA?165.2°)or in light oil(CA?162.7°),or in heavy oil(CA?165.0°),the samples show an excellent superhydrophobicity.According to the comparative experiments,it can be seen that the sample has excellent corrosion resistance,chemical stability,mechanical stability and oil/water separation efficiency.The corrosion current of the sample is as low as 1.67×10^-2 A·cm^-2,and it has the largest impedance modulus value.Besides,after 100 cycles of wear,the static contact angle of the dample remains at about 151°.And the separation efficiency of the sample can still reach 98%after 20 cycles of wear.The morphology of the deposited sample can be controlled by the characteristics of the pulsed electric field of pulse electrodeposition to prepare a deposition layer with excellent superhydrophobic properties quickly and efficiently.By this method,it can not only effectively save time,but also can be easier to extend to other types of conductive metal matrix materials.Thus,it is expected to provide a solution for the deposition of porous metal materials for oil/water separation.