Stability of Octadecyltrimethoxysilane-Based Coatings on Aluminum Alloy Surface

Alexey Y Zhizhchenko, Anastasiia V Shabalina, Ali Al Julaih, Stanislav O Gurbatov, Aleksandr A Kuchmizhak, Satoru Iwamori, Sergei A. Kulinich

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

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.
Original languageEnglish (US)
Pages (from-to)1804
JournalMaterials (Basel, Switzerland)
Volume15
Issue number5
DOIs
StatePublished - Feb 28 2022

ASJC Scopus subject areas

  • Materials Science(all)

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