Linseed polyurethane/tetraethoxyorthosilane/fumed silica hybrid nanocomposite coatings: Physico-mechanical and potentiodynamic polarization measurements studies

The work presents the physico-mechanical properties and potentiodynamic polarization measurements studies of linseed oil based polyurethane/tetraethoxyorthosilane [LPU/TEOS] hybrid and polyurethane/tetraethoxyorthosilane/fumed silica NC [LPU/TEOS/FS] hybrid nanocomposite coatings. The best coating performance was obtained by the inclusion of 2 wt% FS in 2-LPU/TEOS hybrid. 2-LPU/TEOS/FS produced glossy, transparent, flexibility retentive, scratch-resistant and impact resistant coatings at ambient temperature relative to LPU/TEOS coatings. 2-LPU/TEOS/FS showed good scratch hardness (5.5 kg), impact resistance (250 lb/in.), flexibility (1/8 in.) as investigated by standard methods with corrosion rate obtained as 3.567 X 10(-4) mm/year and 4.05 x 10(-4) mm/year and inhibition efficiency as 99.816% and 99.710% in 3.5% NaOH and 3.5% HCI, respectively. (C) 2014 Elsevier BAT. All rights reserved.