Stability of octadecyltrimethoxysilane-based coatings on aluminum alloy surface

Long-term stability in contact with water of organosilane layers formed by octadecyltrimethoxysilane (ODTMS) on polished aluminum alloy (AA2024) through dip-coating was studied by combining SEM, water contact angle measurements, and X-ray photoelectron spectroscopy. Similar organosilane layers were...

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Published in:Materials Vol. 15, № 5. P. 1804 (1-14)
Other Authors: Zhizhchenko, Alexey Y., Shabalina, Anastasiia V., Aljulaih, Ali A., Gurbatov, Stanislav O., Kuchmizhak, Aleksandr A., Iwamori, Satoru, Kulinich, Sergei A.
Format: Article
Language:English
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Online Access:http://vital.lib.tsu.ru/vital/access/manager/Repository/koha:001002552
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245 1 0 |a Stability of octadecyltrimethoxysilane-based coatings on aluminum alloy surface  |c A. Y. Zhizhchenko, A. V. Shabalina, A. A. Aljulaih [et al.] 
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520 3 |a Long-term stability in contact with water of organosilane layers formed by octadecyltrimethoxysilane (ODTMS) on polished aluminum alloy (AA2024) through dip-coating was studied by combining SEM, water contact angle measurements, and X-ray photoelectron spectroscopy. Similar organosilane layers were formed on AA2024 coated with permanganate conversion coating, 1,2-bis(triethoxysilyl)ethane (BTSE) and hydrated SiOx as under-layers, after which their long-term durability was also tested. During immersion in water for about one month, all the samples exhibited a decrease in hydrophobicity, implying the prepared organosilane layer was not stable over time, gradually hydrolyzing and letting water interact with the underlying layer. In parallel, SEM images of one-layer samples taken after immersion showed clear signs of local electrochemical corrosion, while XPS analysis confirmed a loss of silicon from the surface layer. The highest stability over time was demonstrated by a one-layer sample prepared in an ethanol/water bath for 5 min and by a similar ODTMS layer prepared on hydrated MnOx as an under-layer. 
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700 1 |a Shabalina, Anastasiia V.  |9 563315 
700 1 |a Aljulaih, Ali A.  |9 503882 
700 1 |a Gurbatov, Stanislav O.  |9 887047 
700 1 |a Kuchmizhak, Aleksandr A.  |9 887048 
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700 1 |a Kulinich, Sergei A.  |9 503884 
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