(1. 电子科技大学 中山学院 化学与生物系，中山 528402；
2. 中山大学 化学与化学工程学院，广州 510275)
摘 要: 以正硅酸乙酯(TEOS)为前驱体，采用溶胶−凝胶法制备SiO2包覆型水性铝粉，研究TEOS、水和乙二胺的用量、反应温度和反应时间对包覆效果的影响。结果表明：当TEOS、水、乙二胺和片状铝粉的质量比为1.4׃36׃0.75׃1，反应温度为40 ℃，反应时间为6 h时，所得水性铝粉的缓蚀效率达95.4%，而涂膜光泽度为86.1 Gs，仅比溶剂型铝粉的低5.1%。采用扫描电镜、激光粒度分布和红外光谱等手段对SiO2包覆型水性铝粉进行表征，证实SiO2包覆层的存在。
关键字: 水性铝粉；溶胶−凝胶法；表面包覆；正硅酸乙酯；SiO2
（1. Department of Chemistry and Biology, Zhongshan Institute,
University of Electronic Science and Technology of China, Zhongshan 528402, China;
2. School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, China）
Abstract:SiO2-coated waterborne aluminum powders were prepared by sol-gel method with tetraethyl orthosilicate (TEOS) as precursor. The effects of dosage of TEOS, water and ethylenediamine, reaction temperature and reaction time on the corrosion inhibiting efficiency and coater gloss were investigated. The results show that when the mass ratio of TEOS, water, ethylenediamine and naked aluminum powders is 1.4׃36׃0.75׃1, the reaction temperature is 40 ℃ and the reaction time is 6 h, the corrosion inhibiting efficiency is 95.4% and the coater gloss is 86.1 Gs, which is only 5.1% lower than that of the solvent-borne aluminum powders. By SEM, laser particle size analysis and FTIR spectra analysis, SiO2 is proved to be coated on the surface of the as-prepared waterborne aluminium powders.
Key words: waterborne aluminum powder; sol-gel method; surface coating; tetraethyl orthosilicate; SiO2
