Study On Preparation Process Of Non-Fluorine Steel Based Superhydrophobic Surface Based On Electrodeposition

Superhydrophobic surface has attracted special attention in the field of ship and marine engineering due to its special self-cleaning property,low water resistance and good corrosion resistance.For the practical application needs in the field of ship and ocean engineering,it is necessary to develop a steel-based superhydrophobic surface with stable hydrophobic properties and good corrosion resistance.In the superhydrophobic preparation method,the electrodeposition method is very suitable for ship and marine engineering because of its low requirements on equipment,easy expansion to industrial production,and suitable for steel-based surfaces.Therefore,this paper integrates and improves the current electrodeposition process for preparing steel-based superhydrophobic surfaces,combines the advantages of industrial hanging plating,designs small hanging plating baths,builds a supporting experimental platform,and studies a production process close to industrial hanging plating.The electroplating device is simple,the material is cheap and easy to obtain,the preparation process is fast and efficient,the environment is green and friendly,and the preparation of the steel-based superhydrophobic surface with the hydrophobic property and the corrosion resistance can be realized.Since the hydrophobicity of the solid surface depends on the surface morphology and chemical composition,the surface hydrophobicity and surface energy can be controlled by controlling the electrodeposition parameters and post-treatment parameters to change the surface hydrophobic properties.Based on this theory,this paper uses the electrodeposition technology to prepare a rough surface with micro-nano multi-level structure,and achieves the purpose of reducing surface energy by physical heating or chemical modification.The preparation process of steel-based superhydrophobic surface based on electrodeposition method is studied.To achieve a surface with good hydrophobic stability and corrosion resistance on a Q235 carbon steel substrate.The main research contents of this paper are as follows:1.In order to avoid the toxic and harmful pollution caused by the use of fluorine-containing organic substances,the coating is environmentally friendly and has no modified post-treatment process.A superhydrophobic surface with a contact angle of 155.5°was prepared.The surface morphology,roughness,chemical composition,hydrophobic properties,stability and electrochemical properties were characterized by various techniques.The effects of unmodified post-processing parameters and electroplating parameters on the hydrophobic properties of the coating and the changes in electrochemical properties were investigated.However,its hydrophobic properties are not stable enough.The main reason for the analysis of hydrophobic performance failure is that the microscopic roughness of the surface cannot fix the air in the rough structure,and the dynamic pressure of the water droplets and the static water pressure will squeeze out the air after contact with the water droplets.Cassie-The Baxter state is destroyed,resulting in gradual failure of hydrophobic properties and corrosion.2.For the performance defects of the surface prepared by the unmodified post-treatment,considering the characteristics that the plating layer is easily oxidized,thereby exposing a large number of attachment points of stearic acid carboxyl groups.Therefore,a superhydrophobic surface with a contact angle of 154.5° was prepared by post-treatment of the coating with stearic acid.The surface morphology,chemical composition,hydrophobic properties,stability and electrochemical properties were characterized by various techniques.The effects of post-treatment parameters and electroplating parameters of stearic acid modification on surface hydrophobic properties and electrochemical properties were investigated.The law of variation found that the surface self-corrosion current was reduced by two to three orders of magnitude,and the protection efficiency reached 96.8%.It is speculated that the main reason for the change of surface hydrophobic stability and electrochemical performance is that the surface dandelion spherical composite structure is more conducive to the fixation of air,and the substrate is sufficiently isolated from the water droplets,and the hydrophobic stability and corrosion resistance are further improved.