2 research outputs found
Hierarchically Ordered Self-Lubricating Superhydrophobic Anodized Aluminum Surfaces with Enhanced Corrosion Resistance
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