期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 3, 页码 1516-1526出版社
AMER CHEMICAL SOC
DOI: 10.1021/am506568v
关键词
nanoporous anodic aluminum oxide; perfluorooctadecanoic acid; superhydrophobic; corrosion protection; frictional coefficient
资金
- Department of Science and Technology (DST), New Delhi [GAP-08/13]
- Council of Scientific and Industrial Research (CSIR), New Delhi [12 FYP-CSC-0114]
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 degrees 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.
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