Fabrication Of Superhydrophobic Surface And Research On Its Protection Mechanism Of Marine Atmospheric Corrosion

Superhydrophobic surfaces are increasingly used in industrial production due to their excellent anti-fog,anti-ice and self-cleaning properties.However,ordinary superhydrophobic materials also have certain defects,that is,a certain external force is required to make the liquid leave the surface of the material,and the retained droplets are liable to cause corrosion of the metal.This defect limits the range of applications of superhydrophobic materials,especially the complex and volatile environment of the ocean atmosphere.Therefore,this paper introduces the phenomenon of droplet self-bounce into the corrosion protection of super-hydrophobic materials in order to achieve the purpose of corrosion protection of metal materials by the spontaneous bounce behavior of droplets.In this paper,copper was used as the base metal,and the superhydrophobic surface was constructed by hydrothermal synthesis and electrochemical anodization.The wettability,micromorphology and chemical composition of superhydrophobic surfaces were studied by contact angle measuring instrument,SEM,XRD,XPS and other analytical methods.The superhydrophobic surface was observed and analyzed by three-dimensional digital microscope and simulation experiments.Also,the electrochemical polarization curve test was used to analyze the corrosion protection performance of the superhydrophobic surface.The micro-structure of the needle-shaped nano-zinc oxide was constructed on the copper substrate by hydrothermal synthesis,and the surface energy was reduced by silane modification to obtain a superhydrophobic surface with a contact angle of 157.4°.It was observed by simulated condensation experiments that the droplets spontaneously merge and bounce on the surface of the superhydrophobic material and leave the surface.At the end of condensation,the droplet coverage on the superhydrophobic surface was much smaller than the droplet coverage of the bare copper surface,and after the simulated condensation experiment,the superhydrophobic surface still held the air film intact.This surface exhibited excellent corrosion protection in the electrochemical polarization curve test.The microstructure of the elongated tubular nanometer copper hydroxide was constructed on the copper substrate by electrochemical anodization synthesis,and the surface energy was reduced by silane modification to obtain a superhydrophobic surface with a contact angle of 157.7°.The super-hydrophobic surface was subjected to a simulated fogging experiment,and it was observed by a three-dimensional digital microscope that the droplets on the surface grew to a certain volume and merged,and a self-bounce phenomenon occurred,leaving the surface of the material.After the end of the simulated fogging experiment,the superhydrophobic material had a lower droplet coverage than the bare copper surface and still holds the air film intact.It can be found by electrochemical polarization curve test that the surface after simulated fogging had only a small performance degradation,and the current density is about three orders of magnitude smaller than that of the bare copper sample,indicating that the surface still has good corrosion after simulated fogging.