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

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Abstract

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.

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Acknowledgments

We are grateful for the support of Miss Shu-Yi Zhu, Mr. Yang (for SEM), Mr. Jiang (for FTIR) and Mr. Yin (for XPS) for their experimental and measurement contributions.

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Authors and Affiliations

  1. School of Chemical and Energy Engineering, South China University of Technology, Guangzhou, 510640, P.R. China

    Li-Jun Li, Pi-Hui Pi, Xiu-Fang Wen, Jiang Cheng & Zhuo-Ru Yang

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  1. Li-Jun Li
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  2. Pi-Hui Pi
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  3. Xiu-Fang Wen
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  4. Jiang Cheng
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  5. Zhuo-Ru Yang
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Correspondence to Li-Jun Li.

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Li, LJ., Pi, PH., Wen, XF. et al. Aluminum pigments encapsulated by inorganic–organic hybrid coatings and their stability in alkaline aqueous media. J Coat Technol Res 5, 77–83 (2008). https://doi.org/10.1007/s11998-007-9053-9

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