Research On Key Technology Of Steel Super-hydro Phobic Surface Preparation Based On Ni-nSiO₂ Composite Plating

As super-hydrophobic surface has a series of excellent characteristics such as low water friction resistance, high bearing capacity and brilliant corrosion resistance, this technique becomes more and more popular in all walks of life. It also has a very good application prospect in ship and ocean engineering. However, due to the actual requirements of the ship and ocean engineering construction is very special, the current super-hydrophobie surface preparation process cannot meet the requirements of its production. This paper proposes a new type of preparation process of super-hydrophobic surface which is based on nanoparticles composite electroplating. Ni-nSiO2 composite coatings with excellent super-hydrophobic properties were deposited on the surface of Q235 steel substrate.This paper focuses on the experimental research of key technology of super-hydrophobic surface preparation based on nanoparticle composite electroplating. Composite electroplating technology is used in this paper to meet the actual requirements of the ship and ocean engineering construction because it has the advantages of simple equipment, low cost, high efficiency, large processing scale, can be processed flat or curved pkte, can be repaired and so on. Meanwhile, nano silicon dioxide particles and metal nickel ion are co-deposited. It constructed the micro nano dual rough structure of the surface of the lotus leaf on the Q235 steel plate. After being modified by low surface energy of C8F13H4Si(OC2H5)3, it shows good hydrophobicity and wear resistance.An experimental device table for preparing super-hydrophobic surface by composite electroplating method was set up. In this paper, from the point of view of the actual processing, to improve the process flow, plating solution, surface properties, and lay the foundation for the final industrial application of this process. The effects of key process parameters on the experimental results of the current density, bath temperature and plating time on the experimental results were studied. The static contact angle increases and then decreases with the increase of the current density. The static contact angle increases first and then remains with the increase of the temperature of the plating solutio. The static contact angle increases first and then decreases with the increase of plating time. Finally, the optimum technological parameters were determined:The current density is 10A/dm2, the bath temperature is 70 degrees Celsius, the plating time is 30 minutes, the maximum static contact angle is 158.83 degrees.After the experiment, the steel plate was taken by scanning electron microscope. In this paper, the contact angle of the static contact angle is related to the surface microstructure, and reveals the relationship between the microstructure and hydrophobicity. The authors explain the mechanism of the different results when the current density, the temperature of the plating solution and the plating time change.