Research On Preparation And Performance Of Multifunctional Integrated Coating With Bionic Structure

Inspired by organisms in nature,people have conducted in-depth research on the surfaces of different orientation models.After continuous research,some biological surfaces with hydrophobic or superhydrophobic properties have been found.In addition to the waterproof function,it also has some special properties,typically anti-corrosion,self-cleaning,anti-icing and other properties.According to the actual engineering needs,the development of its different functional characteristics has a wide range of application prospects,so it can be explored that the functional surfaces that can be used in actual production have important industrial value and scientific significance,and the existing preparations have special selective surfaces.The method mainly has the disadvantages of high cost,complicated and complicated operation,strict environmental requirements,and difficult practical application.Therefore,in this paper,a simple,efficient and high-precision spraying method is used to prepare a hydrophobic graphene coating with long-term anti-corrosion effect and a multifunctional super-hydrophobic coating with low orientation.After experimental design and optimization,the surface micro-morphology of the best coating layer prepared was observed,the predeterminedness and corrosion resistance of the surface were systematically analyzed,and the mechanism of action between materials,structure and function was revealed.In view of the long-term corrosion protection of metals in the ocean,a one-step spray method is used to apply functional coatings to the surface of metal-based components and form a hydrophobic graphene protective coating.The obtained coating has high corrosion resistance.High adhesion and self-cleaning performance.This method has the characteristics of simple implementation,large-area construction and controllable thickness,and is not affected by the type and shape of the metal substrate.Firstly,the optimized formula is obtained through the optimized ratio of pigments and fillers,and graphene is added on this basis.The performance of the coating increases after increasing the amount of graphene.The performance is the best when the amount is 1%.The contact angle of the layer is about 112°,the hardness can reach d 3H,and the adhesion is level 1.The surface of the coating was smooth and flat and the coating was dense by morphology.The surface of the coating showed good self-cleaning effect through experiments.The wet dipping time of the coating was 63d,the acid resistance time was 32d,and the alkali resistance The time was 39d and the neutral salt spray resistance time was 176d.Electrochemical experiment test analysis shows that the corrosion current density of the conversion coating is reduced by 4 orders of magnitude relative to the corrosion current density of the blank substrate,which proves that the coating has excellent corrosion resistance and can effectively delay the corrosion rate of the substrate and eliminate the coating.Anti-corrosion mechanism of the layer.Inspired by the lotus leaf with self-cleaning properties,polymethyltriethoxytoluene was used to hydrophobically modify MgO and TiO₂microparticles,and a multifunctional integrated fluorine-free superhydrophobic surface with low impurities was designed and constructed.The best solution obtained through optimization experiments is that the contact angle of the prepared self-cleaning super-hydrophobic coating with low pollutant surface is 167.6°,and the rolling angle is 5°.The morphological observation and composition analysis of the coating surface prove that the superhydrophobicity of the superhydrophobic coating surface is determined by the microstructure and chemical composition.The test of the sex experiment proves that the coating can be applied to any substrate and has super-hydrophobicity to different kinds of liquids.The low refractive index of the coating surface was verified by the mirror,broken line,and pulling experiments,and the occurrence of the low-reflection superhydrophobic coating surface was theoretically analyzed by the Cassie-Baxter model.The coating was exposed to ultraviolet light for 120h,the solution test with a pH range of 1-13,and 250 friction cycle tests still maintained superhydrophobic properties,demonstrating good chemical and mechanical stability.After 9 cycles of body etching on the O₂ plasma,the contact angle is still around 160°.After 10 cycles of oil-water separation,the separation efficiency is more than 90%,and the freezing time is delayed to 543s.The hydrophobic coating has better corrosion resistance than the blank bottom layer.In summary,the coating has the stability and the versatility,can replace different fields,and has application promotion value.