Aluminum pigments encapsulated by inorganic-organic hybrid coatings and their stability in alkaline aqueous media

作者：Li Li Jun^*; Pi Pi Hui; Wen Xiu Fang; Cheng Jiang; Yang Zhuo Ru

来源：Journal of Coatings Technology and Research, 2008, 5(1): 77-83.

DOI：10.1007/s11998-007-9053-9

• aluminum pigments
• encapsulated
• sol-gel
• hybrid coatings
• stability

Encapsulated aluminum pigments were prepared by sol-gel derived inorganic-organic hybrid coatings. Aluminum pigments were first coated with sol-gel film by using tetraethoxysilane (TEOS) and vinyltriethoxysilane (VTES) as the precursor, followed by free radical copolymerization of styrene (St), divinylbenzene (DVB) and maleic acid anhydride (MAA) with the vinyl group of the VTES. The as-prepared encapsulated aluminum pigment was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). Subsequently the stability of the aluminum pigments in alkaline aqueous media was examined. It was found that both the TEOS-and-VTES-coated (TV-coated) and the TEOS-VTES-St-DVB-MAA-coated (TVSDM-coated) aluminum pigments were superior in the stability test over the uncoated aluminum pigments. Furthermore, the corrosion protection efficiency of the TVSDM-coated aluminum pigments reaches 99.8%, indicating that the inorganic-organic hybrid composite layer on the surface of the aluminum pigments can protect them well.

• 出版日期2008-3
• 单位华南理工大学