Sol-gel processing of organic-inorganic nanocomposite protective coatings

Organic-inorganic nanocomposite protective coatings are prepared on aluminu m substrates by the spinning technique with the concept of incorporating ho mogeneously nanosized particles (of AlOOH, Al2O3, ZrO2, SiC) into molecular organic-inorganic hybrid matrices. The hybrid matrices are prepared from e poxysilane and bisphenol A with imidazol as catalyst. The AlOOH particles a re derived from aluminum isopropoxide and introduced into the hybrid sols d irectly, and Al2O3, ZrO2, SiC particles are first surface-modified with Si- OH from hydrolyzed TEOS. The coatings are dense, smooth and flexible and in hibit corrosion.