20.500.12556/RUL-133729 Acrylate-based hybrid sol-gel coating for corrosion protection of AA7075-T6 in aircraft applications the effect of copolymerization time Pre-hydrolysed/condensed tetraethyl orthosilicate (TEOS) was added to a solution of methyl methacrylate (MMA) and 3-methacryloxypropyltrimethoxysilane (MAPTMS), and then copolymerised for various times to study the influence of the latter on the structure of hybrid sol-gel coatings as corrosion protection of aluminium alloy 7075-T6. The reactions taking place during preparation were characterised using real-time Fourier transform infrared spectroscopy, dynamic light scattering and gel permeation chromatography. The solution characteristics were evaluated, using viscosimetry, followed by measurements of thermal stability determined by thermogravimetric analysis. The optimal temperature for the condensation reaction was determined with the help of high-pressure differential scanning calorimetry. Once deposited on 7075-T6 substrates, the coatings were evaluated using a field emission scanning electron microscope coupled to an energy dispersive spectrometer to determine surface morphology, topography, composition and coating thickness. Corrosion properties were tested in dilute Harrison’s solution (3.5 g/L (NH$_4$)$_2$SO$_4$ and 0.5 g/L NaCl) using electrochemical impedance spectroscopy. The copolymerization of MMA and MAPTMS over 4 h was optimal for obtaining 1.4 µm thick coating with superior barrier protection against corrosion attack (|Z$_{10}$ $_{mHz}$| ~ 1 GΩ cm$^2$) during three months of exposure to the corrosive medium. AA7075-T6 hybrid sol-gel copolymerization corrosion dilute Harrison’s solution true false true Angleški jezik Ni določen Članek v reviji 2021-12-13 08:29:48 2021-12-13 08:29:49 2022-09-13 03:52:22 0000-00-00 00:00:00 2020 0 0 26 str. iss. 4, art. 948 Vol. 12 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.1/.2 2073-4360 10.3390/polym12040948 33305639 RAZ_Rodic_Peter_2020.pdf RAZ_Rodic_Peter_2020.pdf 1 F9B45BA76392635E94E1AA5FE56FAB8C 5fd6afe08257040573eebd1a84ac9fe0672b1e64a4e7eadcb45c00f3ecaae09c 8673b2ce-5be6-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=152037 https://www.mdpi.com/2073-4360/12/4/948 0 7496c1e5-5be6-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=152036 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0