| Because of the superhydrophobic and oleophobic properties of superamphiphobic coating,the application prospect is very wide.The metal surface with superamphiphobic coating has excellent performance in self-cleaning,anti-corrosion and anti-fouling,which can effectively prevent corrosion and pollution,so as to adapt to more complex environment application scenarios.At present,there are some problems such as complex preparation process,poor stability and mechanical strength,and high cost of metal-based superamphiphobic coatings.Most of its related researches remain in the basic research stage in the laboratory,and its scale application in the industry is still far away.In this paper,the preparation method,properties and related binding mechanism of superamphiphobic coatings on metal substrate surface were studied.The main research contents include:preparation and properties characterization of metal-based superamphiphobic coatings;Effect of rough metal matrix on coating properties;Binding mechanism of superamphiphobic coatings.Nano-SiO2 and epoxy resin E51 are used as main raw materials,and silane coupling agent KH-560 and perfluoro-decyl trimethoxy-silane are used to modify nano-SiO2,and sprayed on the surface of the metal matrix after the treatment of silane coupling agent KH-550 by spraying method,and the superamphiphobic coating was successfully prepared.The surface morphology,wettability,adhesion,self-cleaning,abrasion resistance and acid and alkali corrosion resistance were characterized and tested.The optimal mass ratio between modified nano SiO2 and epoxy resin E51 was 1:1.5.At this time,the coating has strong adhesion ability,and has good self-cleaning,abrasion resistance and acid and alkali corrosion resistance.The properties of superamphiphobic coatings on different metal matrix are compared and analyzed.It is found that superamphiphobic coatings have good performance on different metal matrix.The metal matrix was roughened by sand blasting and the influence of substrate roughness on the properties of superamphiphobic coating was studied.It is found that when the substrate roughness is 15.9μm,the wear resistance of the coating is the best,and the wear resistance of the superamphiphobic coating increases with the increase of the matrix roughness,but when it exceeds a certain value,the wear resistance of the coating decreases,and the reasons for the decrease are studied.The tensile shear test was used to test the bonding strength of smooth and rough metal matrix.It was found that rough metal matrix can improve the bonding strength of coatingThe cross-section morphology of metal-based superamphiphobic coating was observed,and it was found that the coating was composed of three parts,including metal matrix,silane film and superamphiphobic coating.The binding mechanism between silane film and metal matrix and between silane film and superamphiphobic coating layer was studied by means of infrared spectroscopy,X-ray photoelectron spectroscopy and other characterization analysis methods.It was found that there was not only physical binding between layers,but also chemical bonding between layers. |
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