Electrophoretic Deposition Of Super-hydrophobic Surface And Its Application In Corrosion Protection Of Metals

In recent years, the super-hydrophobic materials have caused an enormous amount of interests in both fundamental research and potential application due to their unique properties. Super-hydrophobic materials show the great potential application in the fields of self-cleaning, anti-fogging, anti-snowing, anticorrosion and oil/water separation. Currently, most of these methods fabricating super-hydrophobic materials have more or less some problems, such as:complex procedures, high cost, severe conditions and difficult to control, which seriously limit the practical application of super-hydrophobic materials. In this thesis, dodecyltrimethoxysilane ?DTMS? was used as low surface energy material, and nano-SiO₂ was used to build the roughness for the preparation of super-hydrophobic films by electrophoretic deposition method. This method requires low price of raw materials, simple and inexpensive equipment as well as being easy to scale up, formed films show uniformity, and complex-shaped materials can be coated. The main contents are listed as follows:?1? Silica nano-powder is modified by DTMS as low surface energy to get super-hydrophobic silica nanoparticles ?SH-SiO₂?. Then super-hydrophobic films are fabricated respectively in different solvent systems by the anode and cathodic electrophoretic deposition on the surface of aluminum alloy and mild steel. In order to improve the adhesion of the films, the electrophoretic paint is added in the electrophoretic solution. By changing the electrophoretic voltage, electrophoretic time and the concentration of SH-SiO₂ nanoparticles and electrophoretic paint, the property of super-hydrophobic surface can be controlled.?2? Super-hydrophobic films prepared by electrophoretic deposition are used for anti-corrosion of different metals. Electrochemical technology and other tests suggested that the super-hydrophobic surfaces on aluminum alloy and mild steel respectively fabricated by anode and cathodic electrophoretic deposition have the good corrosion resistance. In addition, SH-SiO₂ nanoparticles are first loaded corrosion inhibitors ?benzotriazole, BTA?, then the corrosion protection of prepared composite super-hydrophobic surfaces have been further improved.