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Influence of curing temperature, silica nanoparticles- and cerium on surface morphology and corrosion behaviour of hybrid silane coatings on mild steel

DSpace at IIT Bombay

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Title Influence of curing temperature, silica nanoparticles- and cerium on surface morphology and corrosion behaviour of hybrid silane coatings on mild steel
 
Creator PHANASGAONKAR, A
RAJA, VS
 
Subject sol-gel coatings
galvanized steel
carbon-steel
electrochemical-behavior
bis-silane
al 2024-t3
m nacl
films
protection
pretreatments
hybrid coatings
silanes
corrosion and oxidation
nanoparticles
cerium
mild steel
 
Description This work is aimed at developing and investigating silane based organic-inorganic hybrid coatings possessing unique properties, which can be used to improve the performance of steel structures subjected to marine corrosion. These silane based sol-gel coatings were prepared by dip coating planar samples of mild steel in solution of an organically modified silica sol made from hydrolysis and polycondensation of tetraethylorthosilicate (TEOS) and methyltriethoxysilane (MTES) in acid catalysis condition. Crack-free coatings were obtained on curing at 200 degrees C. On increasing the curing temperature to 400 degrees C, however, cracks developed in the plain organic-inorganic hybrid coatings. This observation was consistent with the visual observations where appearance of the coated specimen changed from colourless metallic to brownish grey on curing from 200 degrees C to 400 degrees C temperature. The coatings were further modified using SiO(2) nanoparticles and cerium. The effect of change in the - temperature as well as - composition on the microstructural properties of the coatings was determined using optical microscopy, scanning electron microscopy and atom force microscopy. Additionally, Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy (ATR/FTIR) was carried out to show the formation of the Si-O-Si structural backbone of the hybrid material with the organic CH(3) group incorporated into the silica network. The corrosion protection performance of these coatings was examined using potentiodynamic polarisation technique and electrochemical impedance spectroscopy in aerated 3.5 wt.% NaCl solution. The polarization curves and corrosion resistance as measured by the bode plots suggested that the plain hybrid coatings offer good protection against corrosion. However, the SiO(2) and cerium modified nano hybrid coatings exhibited superior performance to that displayed by plain hybrid coatings. (C) 2009
 
Publisher ELSEVIER SCIENCE SA
 
Date 2011-07-28T09:57:23Z
2011-12-26T12:58:57Z
2011-12-27T05:49:41Z
2011-07-28T09:57:23Z
2011-12-26T12:58:57Z
2011-12-27T05:49:41Z
2009
 
Type Article
 
Identifier SURFACE & COATINGS TECHNOLOGY, 203(16), 2260-2271
0257-8972
http://dx.doi.org/10.1016/j.surfcoat.2009.02.020
http://dspace.library.iitb.ac.in/xmlui/handle/10054/7370
http://hdl.handle.net/10054/7370
 
Language en