摘要： 研究了一种海洋用铝合金6061基材低表面能防腐涂层的制备方法,利用空气喷涂法将氟硅树脂、固化剂、改性纳米材料羟基碳纳米管(CNT-OH)等形成的混合液喷涂在基材上形成涂层。对CNT-OH/氟硅树脂复合涂层的接触角/滚动角、表面能、硬度、附着力、表面形貌、耐水性、耐腐蚀性等性能进行了表征测试。结果表明:当添加0.3%CNT-OH(以氟硅树脂质量计)时,复合涂层的接触角/滚动角分别为121°/21°,表面能为22 m N/m;复合涂层表面具有一定的微观粗糙结构,均方根粗糙度达到3.078 nm;涂层的硬度和附着力分别达到5H和0级;不同温度和盐度条件下,经过浸泡试验和盐雾箱试验25 d后,复合涂层仍表现出良好的耐水性和耐盐水腐蚀性。可认为,CNT-OH对氟硅树脂具有良好的改性作用。

关键词: 低表面能, 氟硅树脂, 羟基碳纳米管, 耐水稳定性, 耐腐蚀性

Abstract: A preparation of nanocomposite coating with low surface energy on the surface of marinely-used aluminium alloy 6061 has been described. The coating is prepared by air spraying method using a mixed solution mainly containing fluorine silicone resin, a curing agent and hydroxyl carbon nanotubes ( CNT-OH). The performance of the CNT-OH/fluorine silicone resin composite coating is characterized. The result shows that the contact angles, rolling angles and the surface energy of the coatings are 121°, 21°and 22 mN/m respectively.The RMS roughness reaches 3. 078nm while the hardness and adhesion of the nanocomposite coating are 5H and level 0 respectively. The obtained nanocomposite coating has excellent salt water resistance stability and anticorrosion after salt solution immersion and salt spraying tests for 25 days under various temperatures and salinities. It can be concluded that CNT-OH has a good modification effect on the fluorine silicone coating.

Key words: low surface energy, fluorine silicone resin, hydroxyl carbon nanotubes, water resistant stability, anticorrosion