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题 目
无机纳米粒子填充有机-无机复合涂层制备与性能
无机纳米粒子填充有机-无机复合涂层制备与性能
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无机纳米粒子填充有机-无机复合涂层制备与性能
摘 要
用溶胶-凝胶法分别制备了纳米SiO2和TiO2掺杂的有机-无机复合涂层,采用浸渍-提拉法在铝合金基体表面涂覆复合涂层,并在不同温度下进行热处理,制备相应的涂层试样。通过电化学阻抗谱法(EIS)、极化曲线和扫描电镜(SEM)等方法来研究所制备的各种复合涂层,结果表明:含0.04wt%的纳米SiO2复合涂层和含0.08wt%的纳米TiO2复合涂层的耐腐蚀性能最好。并在上述两种溶胶中引入不同类型的修饰剂来考察复合涂层憎水性能,进而制备了憎水性较好的复合涂层。通过分析表明,所制备的憎水性良好的无机纳米粒子掺杂有机-无机复合涂层具有较高的憎水性和良好的防护性。
关键词:溶胶-凝胶,耐腐蚀性,电化学阻抗,憎水性
The Preparation and Performance of Organic-inorganic Composite Coatings Doped with Inorganic Nano-particles
Abstract
Sol-gel coatings were dip-coated on pretreated Al substrates and heated under varied sintering temperature. Based on this technique, organic-inorganic composite coatings doped with two different inorganic nano-particles, i.e., SiO2 and TiO2, were prepared, and their corrosion resistance properties characterized. The properties and structure of the organic-inorganic coatings were studied in a neutral 0.35 M NaCl solution by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) as well as scanning electron microscopy (SEM) techniques. The results show that introduction of inorganic nano-particles into the sol-gel coatings enhances the coatings’ corrosion protection performance. Moreover, the coatings derived from sol containing 0.04% mass fraction of SiO2 and sol containing 0.08% mass fraction of TiO2 show an excellent performance. In order to improve the hydrophobic property of the coatings, several kinds of silane coupling agents have been used as surface modifiers to prepare water-repellent coatings. Determination of contact angle for water on well-prepared hydrophobic inorganic nanoparticles doped organic-inorganic composite coatings shows these coatings are of highly hydrophobicity and offer a good protection to metallic substrates.
Key Words:Sol-gel; Corrosion resistance; Electrochemical impedance spectroscopy; Hydrophobic
目 录
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