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Corrosion studies and interfacial bonding of urea/poly(dimethylsiloxane) sol/gel hydrophobic coatings on AA 2024 aluminium alloyJapelj Fir, Mojca ...Bis[(ureapropyl)triethoxysilane] bis(propyl)-terminated-polydimethylsiloxane 1000 (PDMSU), an organic-inorganic hybrid, diluted in either EtOH or a mixture of EtOH-PrOH, was used in thin film form ... (<200 nm) to inhibit the corrosion of AA 2024 alloy. Potentiodynamic, time-dependent cyclovoltammetric measurements and salt spray tests showed that the corrosion inhibition of the latter was 10 times higher than that of the former films. This was correlated with the higher degree of hydrolysis and the formation of more open polyhedralsilsesquioxane species (T2) in the bulk heat-treated PDMSU/EtOH-PrOHxerogels (29Si NMR spectra). The structure of the coatings deposited on AA 2024 Al alloy was deduced from the infrared reflection-absorption (IR RA) spectra, which revealed more extensive urea-ureainteractions and more efficient silane-Al interface bonding for the PDMSU/EtOH-PrOH coatings with higher corrosion inhibition. Ex situ IR RA potentiodynamic spectroelectrochemical measurements of PDMSU coatings revealed that their degradation did not proceed via the formation of silanol groups and consequent hydration of the coatings but that they decomposed above Ecorr by forming fragments composed of -CH2- segments in an all-trans conformation.Source: Langmuir. - ISSN 0743-7463 (Vol. 23, no. 10, 2007, str. 5505-5514)Type of material - article, component partPublish date - 2007Language - englishCOBISS.SI-ID - 3681306
Author
Japelj Fir, Mojca |
Orel, Boris, 1943- |
Surca, Angelja Kjara |
Vilčnik, Aljaž |
Ješe, Robi |
Francetič, Vojmir
Topics
kemija materialov |
korozija |
hidrofobni premazi
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Japelj Fir, Mojca | 22425 |
Orel, Boris, 1943- | 02565 |
Surca, Angelja Kjara | 14121 |
Vilčnik, Aljaž | |
Ješe, Robi | 22579 |
Francetič, Vojmir | 18194 |
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