Influence of sol-gel process parameters on the protection properties of sol-gel coatings applied on AA2024
authors Yasakau, KA; Carneiro, J; Zheludkevich, ML; Ferreira, MGS
nationality International
journal SURFACE & COATINGS TECHNOLOGY
author keywords Sol-gel; Aging; Cerium nitrate; Inhibitor; AA2024; Corrosion protection
keywords CORROSION PROTECTION; CERIUM CONCENTRATION; CONVERSION COATINGS; ALUMINUM 2024-T3; ALLOYS; PERFORMANCE; INHIBITION; CONDENSATION; CAPACITANCE; CHROMATE
abstract The present work explores effects of shelf-life, temperature and the presence of cerium nitrate additive on the protective performance of sol-gel coatings applied on AA2024. These are important parameters when industrial applicability of coating formulations is considered. The studied sol-gel system is based on a combination of metalorganic precursor titanium(IV) propoxide and hybrid epoxy silane 3-glycidoxypropyltrimethoxysilane. The synthesized sol-gel formulations without or with addition of 0.007 M Ce(NO3)(3) were aged during different times at temperatures 25 degrees C or 6 degrees C. FTIR results show that the intensities of the bands associated to Si- O-Si increase with respect to Si-OH groups during the aging process as a result of extended condensation. However, such transformations occur less rapidly at low temperature. The electrochemical impedance spectroscopy measurements clearly show that sol-gel coatings corresponding to the sol-gel aged at low temperature exhibit similar corrosion protective capabilities compared to the coating obtained without sol-gel aging. It is also observed that the protection performance of the sol-gel coatings with cerium nitrate obtained after two weeks of sol-gel aging is lower compared to the coatings without cerium additive. This effect is attributed to the enhanced reactivity of the sol-gel due to cerium(III) presence. (C) 2014 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 0257-8972
year published 2014
volume 246
beginning page 6
ending page 16
digital object identifier (doi) 10.1016/j.surfcoat2014.02.038
web of science category Materials Science, Coatings & Films; Physics, Applied
subject category Materials Science; Physics
unique article identifier WOS:000335106000002
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  impact metrics
journal impact factor (jcr 2016): 2.589
5 year journal impact factor (jcr 2016): 2.538
category normalized journal impact factor percentile (jcr 2016): 76.334
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