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通过模板法制备了介孔SiO_2(MSN),然后将缓蚀剂苯并三氮唑(BTA)吸附于介孔内,并以CB[6]作为封孔剂,然后依次用硅烷偶联剂及丁二胺对其表面进行改性,制备了pH受控释放的开关型纳米容器,并以SEM,TEM,XRD及BET表征其微观形貌及化学结构。将包覆BTA缓蚀剂的纳米容器分散于聚氨酯清漆中,并喷涂于2024铝合金基体表面,考察其对聚氨酯涂层抗盐雾能力的增强效果。通过60℃3.5%NaCl溶液浸泡和盐雾(NSS)条件下的电化学测试以及AFM、SEM形貌分析表明:掺杂封装BTA的纳米包覆缓蚀剂可实现碱性条件下缓蚀剂的受控释放,使聚氨酯涂层的抗盐雾腐蚀能力提高了6倍,并赋予了涂层一定的自修复能力。
The mesoporous SiO 2 (MSN) was prepared by the template method, then the corrosion inhibitor benzotriazole (BTA) was adsorbed in the mesopores, CB [6] was used as the sealing agent, and then silane coupling agent and Butanediamine was used to modify its surface. The controlled release nano-container with pH was prepared. Its microstructure and morphology were characterized by SEM, TEM, XRD and BET. The nano-container coated with BTA inhibitor was dispersed in polyurethane varnish and sprayed onto the surface of 2024 aluminum alloy substrate to investigate its anti-salt fog ability of polyurethane coating. Electrochemical tests at 60 ℃ under 3.5% NaCl solution and salt spray (NSS), as well as AFM and SEM morphological analysis showed that nano-coated corrosion inhibitors doped with BTA can achieve corrosion inhibition under alkaline conditions Controlled release increases the salt spray resistance of polyurethane coatings by 6 times and gives the coating a certain degree of self-healing.