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对铝基进行恒电流阳极氧化后,采用正辛基三乙氧基硅烷化学改性,制得超疏水膜。采用接触角测试仪、扫描电镜、红外光谱仪、电化学工作站等,研究了所得超疏水膜的静态接触角、表面形貌、结构及耐蚀性。结果表明,经阳极氧化后,铝基构建了粗糙的微纳米结构,再硅烷化处理后,铝基表面的疏水性增强,静态接触角大于150°。超疏水膜使铝在质量分数为3.5%的NaCl溶液中的自腐蚀电位正移0.11V,腐蚀电流密度降低4个数量级,有效地提高了铝的耐蚀性。
After constant current anodizing aluminum base, the n-octyl triethoxysilane was chemically modified to obtain a superhydrophobic film. The contact angle, the surface morphology, the structure and the corrosion resistance of the obtained superhydrophobic films were investigated by using contact angle tester, scanning electron microscope, infrared spectrometer and electrochemical workstation. The results show that the anodic oxidation results in the formation of rough micro-nano structure on the aluminum substrate. After re-silanization, the hydrophobicity of the aluminum-based surface is enhanced and the static contact angle is more than 150 °. The superhydrophobic membrane made the self-corrosion potential shift by 0.11V and the corrosion current density by 4 orders of magnitude in the 3.5% NaCl solution, which effectively improved the corrosion resistance of aluminum.