تهيه و شناسايي پوششهاي نانوكامپوزيتي هيبريدي آلي - معدني بر پايه تترامتوكسي سيلان و رزين اپوكسي به روش سل - ژل

Synthesis and Characterization of Hybrid Organic-inorganic Nanocomposite Coatings Based on Tetramethoxysilane and Epoxy Resin by Sol - gel Method

Inorganic-organic hybrid (nanocomposite) coatings has found many applications, due to good mechanical, anti - abrasive and anti-corrosion properties. These hybrids are considered appropriate alternatives to chromated coatings for protection of aluminum surface, because they exhibit good adhesion properties for metal surfaces, resistance to corrosion and abration and thermal stability. These coatings consist of interpenetrating organic-inorganic networks. Inorganic phase consists of tetramethoxysilane (TMOS) and organic phase consists of epoxy resin and aromatic amine curing agent. This inorganic-organic hybrid is formed by sol-gel process. In this work, the hybrid was coated on the 1050 aluminum alloy substrate by dip coating method, and then the reaction between the inorganic-organic hybrid and substrate, and formation of C-O-Si bonds have been characterized by FTIR and ATR.Thermal stability of coatings were studied by thermal gravimetric analysis and simultaneous thermal analysis. The distribution of inorganic particles in these hybrid coatings has been studied by scanning electron microscopy. The range of particle size was measured as 20-100 nm. The transparency of the film was confirmed by UV-visible. The adhesion strength of these hybrid coatings was observed by cross-cut and corrosion resistance by salt spray method and moisture test.