Electro-Organic, CSIR-Central Electrochemical Research Institute , Karaikudi 630 006, India.
ACS Appl Mater Interfaces. 2015 Jan 28;7(3):1516-26. doi: 10.1021/am506568v. Epub 2015 Jan 12.
Herein, we report a facile method for the fabrication of self-lubricating superhydrophobic hierarchical anodic aluminum oxide (AAO) surfaces with improved corrosion protection, which is greatly anticipated to have a high impact in catalysis, aerospace, and the shipping industries. This method involves chemical grafting of as-formed AAO using low surface free energy molecules like long chain saturated fatty acids, perfluorinated fatty acid (perfluorooctadecanoic acid, PFODA), and perfluorosulfonicacid-polytetrafluoroethylene copolymer. The pre and post treatment processes in the anodization of aluminum (Al) play a vital role in the grafting of fatty acids. Wettability and surface free energy were analyzed using a contact angle meter and achieved 161.5° for PFODA grafted anodized aluminum (PFODA-Al). This study was also aimed at evaluating the surface for corrosion resistance by Tafel polarization and self-lubricating properties by tribological studies using a pin-on-disc tribometer. The collective results showed that chemically grafted AAO nanostructures exhibit high corrosion resistance toward seawater and low frictional coefficient due to low surface energy and self-lubricating property of fatty acids covalently linked to anodized Al surfaces.
本文报道了一种简便的方法，可制备具有改进的腐蚀防护性能的自润滑超疏水分级阳极氧化铝 (AAO) 表面，这在催化、航空航天和航运等领域具有很高的应用前景。该方法涉及使用低表面能分子，如长链饱和脂肪酸、全氟辛酸 (PFODA) 和全氟磺酸-聚四氟乙烯共聚物，对形成的 AAO 进行化学接枝。铝 (Al) 阳极氧化过程中的预处理和后处理过程对脂肪酸的接枝起着至关重要的作用。使用接触角仪分析润湿性和表面自由能，得到接枝全氟辛酸的阳极氧化铝 (PFODA-Al) 的接触角为 161.5°。本研究还旨在通过使用盘销式摩擦磨损试验机进行 Tafel 极化和自润滑性能评估来评估表面的耐腐蚀性。综合结果表明，化学接枝的 AAO 纳米结构由于与阳极氧化铝表面共价结合的脂肪酸具有低表面能和自润滑性，因此对海水具有高耐腐蚀性和低摩擦系数。
