Preparation of silica encapsulated waterborne aluminum pigments based on nickel ammonia complex ion as anchoring agent

doi:10.3969/j.issn.1000-1565.2016.02.006

Abstract

Abstract: The silica encapsulated waterborne aluminum pigments were prepared using［Ni(NH₃)₆］²⁺ as anchoring agent.Fourier transform infrared spectroscopy and X-ray diffraction results showed that the boehmite was formed on the surface of aluminum flakes by［Ni(NH₃)₆］²⁺ oxidizing aluminum.The results of scanning electron microscopy,optical microscopy and corrosion resistance test proved that by controlling the pH of encapsulated media at about 9.5,the boehmite on aluminum flakes surface can react with silanols which come from the hydrolysis of tetraethoxysilane and silane. This makes a silica sol-gel film form on the aluminum flakes surface.This sol-gel film improves the corrosion resistance of the aluminum pigments.

Key words: silica encapsulated aluminum pigments, corrosion resistance, silica sol-gel method, anchorage mechanism, waterborne aluminum pigment

CLC Number:

TG174

MA Zhiling,QIAO Yanjun,WANG Xianling,JIANG Zhen,ZHANG Chenguang. Preparation of silica encapsulated waterborne aluminum pigments based on nickel ammonia complex ion as anchoring agent[J]. Journal of Hebei University (Natural Science Edition), 2016, 36(2): 141-147.

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