Facile Fabrication Of Iron-based Superhydrophobic Surfaces Via Electric Corrosion

Superhydrophobic surface is playing an increasingly important role in the field of catalysis, lubrication, waterproof, biomedical materials as its excellent performance, like self-cleaning, anti-icing, reducing the friction resistance, anti-corrosion, etc. As carbon steel is the most widely used engineering material and steel superhydrophobic surface can reduce the corrosion to save energy and money. So fabricating superhydrophobic surfaces on the carbon steel has a vital significance. The article firstly analyzed the micro morphology of the wild duck feathers and characterized its fractal dimension; the Q345 superhydrophobic surface was prepared on the basis of the combination of metal microstructure;And studied electric corrosion process parameters,the mechanism of electric corrosion, the wettability of the superhydrophobic surface,the fractal dimension,and the anti-corrosion properties,mechanical durability,antiicing property.The microstructure and the hydrophobicity of the duck feather has been studied. Its contact angle is 154±0.5°,the sliding angle is 3°. It is shown that the water droplet contact confirms to Cassie model. Calculated with the method of box dimension,the fractal dimension of the feather is 2.46.The electric corrosion process of duck-weather-like surface has been studied and the as-prepared surface morphology has been analyzed. Result shows that:the duckfeather-like superhydrophobic surface can be successfully prepared by electric corrosion method and subsequent modification with low surface free energy materials,the contact angle of the surface was up to 152°,the sliding angle was 1-2°. The asprepared superhydrophobic surface has a very low adhesion force. Researches on the surface morphology,fractal,mechanism of superhydrophobic ability show that:the coarse structure of the as-prepared surface is similar to duck feather, the fractal dimension of the surface is 2.70.The superhydrophobic surfaces on 40 Cr,65Mn,45 steel,GCr15 and 16 Mn have been successfully fabricated by electric corrosion method. It is shown that electric corrosion method has a good usability for preparing superhydrophobic surface based on carbon steel.The superhydrophobic surface corrosion current density is far lower than that of bare steel,showing that superhydrophobic surface achieves an excellent anti-corrosion ability compared to bare steel;a steam-freezing test showed that the superhydrophobic surface can reduce almost half ice film unit area compared with bare surface; the chemical stability test showed that the as-prepared superhydrophobic surface has an excellent chemical stability,and may be applied in acid rain;The mechanical durability test showed that the superhydrophobic surface can endure 80 cm of abrasion at 4641.7Pa on 800 grid sandpaper. And the coarse structure can be rebuilt neatly and quickly in a large scale without moving it to special working condition. The method can be used in the field of construction.In summary,based on the fractal characterization of duck feather surface micro structure,combing the characteristics of the metal metallographic. In this paper duckfeather-like superhydrophobic surface was fabricated on Q345 carbon steel successfully,and the as-prepared surface has many excellent properties. The preparation approach is so easy and time-saving that it delivers an opportunity to construct a superhydrophobic surface on carbon steel substrate and provides the feasibility for the industrial application of the superhydrophobic surface.