Superhydrophobic Surfaces Preparation And Antifouling Properties Of Marine Metal

With development and use of all facilities in the oceans human will inevitably encounter the problem of marine bio-fouling, these marine fouling organisms will bring many issues such as resistance increases, fuel consumption and speed decrease. Bionics study found that the majority of organisms live in the ocean can resist variety of marine fouling organisms adhesion according to its special surface morphology. For example, the shark’s skin surface covered with micron ribbed dermal tissue, which is also covered with hydrophobic nano scale spines or bristles, the plant is difficult to attach on it and algae or other plants can not grow on its surface. Shark skin effect is based on anti-adhesion superhydrophobic surfaces combined with the surface morphology and surface wettability which laid the theoretical foundation. In this paper, taking Q235A marine steel and Ti6A14V alloy as base material, using the combination of micro-structure and nanoparticles implanted on the surface, prepared the superhydrophobic surfaces with micro-nano structure,and studied its wettability and antifouling properties. The main research contents and results are as follows:1. Taking Q235A marine steel as base material, built grid topography using laser technician, prepared the superhydrophobic surfaces using Sol-Gel method which took epoxy as bsed, nano-SiO2as filler. Regulated the surface wettability by changing silica concentration. Experiments showed that the surface contact angle increaseed with the increasing concentration of nano-SiO2, up to168.2°, roll angle decreaseed with the increasing concentration nano-SiO2, the minimum was only0.29°.2. Taking Ti6Al4V alloy as base material, prepared the superhydrophobic surfaces using the same method. Experiments showed that contact angle decreased with the increasing distance, up to163.8°, roll angle decreased with the decreasing distance, the minimum was only0.89°. Compared dot structures with grid structures, found that modified by the low surface energy materials the dot structures conformed the hydrophobic state of Wenzel mode, the grid structures conformed the superhydrophobic state of Wenzel mode, both of these two structures which were coated with nano-SiO2conformed the superhydrophobic state of Cassie mode, and with the increasing distance the contact angle increaseed, roll angle decreaseed.3. Studied with antifouling properties of Ti6A14V alloy surface with different wettability by using immersion experiments and peg board test. Experiments showed that amount of mucosal adhesion on sample surface were:dot structure of superhydrophilic state> polishing surface of hydrophilic state> grid structure of superhydrophilic state> the surface of superhydrophobic state.