Zhizhchenko Alexey Y, Shabalina Anastasiia V, Aljulaih Ali A, Gurbatov Stanislav O, Kuchmizhak Aleksandr A, Iwamori Satoru, Kulinich Sergei A
Far Eastern Federal University, Vladivostok 690091, Russia.
Institute of Automation and Control Processes of FEB RAS, 5 Radio St., Vladivostok 690041, Russia.
Materials (Basel). 2022 Feb 28;15(5):1804. doi: 10.3390/ma15051804.
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 SiO 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 MnO as an under-layer.
通过结合扫描电子显微镜（SEM）、水接触角测量和X射线光电子能谱，研究了十八烷基三甲氧基硅烷（ODTMS）通过浸涂在抛光铝合金（AA2024）上形成的有机硅烷层与水接触的长期稳定性。在涂有高锰酸盐转化涂层、1,2-双（三乙氧基硅基）乙烷（BTSE）和水合SiO作为底层的AA2024上形成了类似的有机硅烷层，之后也测试了它们的长期耐久性。在水中浸泡约一个月期间，所有样品的疏水性均下降，这意味着制备的有机硅烷层随时间不稳定，逐渐水解并使水与底层相互作用。同时，浸泡后拍摄的单层样品的SEM图像显示出局部电化学腐蚀的明显迹象，而XPS分析证实表面层硅的损失。在乙醇/水浴中制备5分钟的单层样品以及在水合MnO作为底层上制备的类似ODTMS层表现出随时间最高的稳定性。
