Studies On Synthesis Of Superhydrophobic Surface And Super Slippery Surface And Their Performances

People start to copy the micro-nano structure of lotus leaves obtaining superhydrophobic surfaces inspired by nature. Researchers are attracted by superhydrophobic surfaces due to its anti-ice,anti-oxidant,self-cleaning,anti-fouling,anti-corrosion properties. With the deep research of superhydrophobic surfaces, the shortcomings of superhydrophobic materials appear gradually. Hence, it is essential to explore new materials to extend the application of metals under the extreme environment. The superhydrophobic surfaces and super slippery surfaces were fabricated by one-step immersion, electrochemical anodization and Solution impregnation self-assembly methods in this paper.The superhydrophobic surfaces with different morphologies were fabricated by one-step solution-immersion method in this chapter. Compared with the observation of SEM,the rough structure and hydrophobicity of surfaces is apparent with the increase of concentration and immersion time. The contact angles of superhydrophobic surfaces after immersing in 3% OTS ethanol solution for 6 h, 12 h, 24 h and 36 h were about 159°. The anticorrosion properties of four superhydrophobic surfaces were tested by electrochemical impedance spectroscopy. And the corrosion current density of four superhydrophobic surfaces decreased three orders of magnitude.Sheet-layer pores structure super slippery surfaces on aluminum was designed by two-step electrochemical anodizing and lubricating oil modification. The super slippery surfaces had many good properties. The anti-ice property of super slippery surfaces was put in the temperature of 18℃, -15℃ and -30℃ for 30 min, there was not any ice on super slippery surfaces. After electrochemical analysis, the super slippery surfaces were immersed in 3.5%NaCl for 25 h, 50 h, 295 h and 1008 h, respectively. The latter two |Z| values were more 4 and 5 magnitudes than the former two and pure aluminium.Compact Co3O4 layers were grown on pure aluminum and anodic aluminum oxide (AAO)generating by electrochemical anodizing,and then super-slippery surfaces were fabricated on the two substrates by immersing in lubricating oil. In comparison with Co3O4 growth on pure aluminum super slippery surfaces, the Co3O4 growth on AAO super slippery surfaces showed longer super slippery time,demonstrating that porosity of substrates is a key factor in keeping super slippery property. Treatment with liquids at different pH values was tested by the measurement of water contact angles, the water contact angles and slide angles did not change,comparing with Co3O4 grown on pure aluminum super slippery surfaces, water contact angles and slide angles were increasing with liquid pH. In addition, Co3O4 grown on pure aluminum super slippery surfaces lost super slippery property after placing 2 months. Furthermore, the anti-corrosion property of two super slippery surfaces was investigated by electrochemical impedance spectroscopy. The |Z| value of Co3O4 growth on AAO super slippery surfaces was more 1 magnitudes than Co3O4 growth on pure aluminum super slippery surfaces after immersing in 3.5% NaCl for 16 h.