Journal
TRANSACTIONS OF THE INSTITUTE OF METAL FINISHING
Volume 101, Issue 1, Pages 19-28Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00202967.2022.2105571
Keywords
Aluminium anodisation; nanoporous anodic alumina; anodic oxide layer; deep eutectic solvents; ionic liquids; choline dihydrogen citrate eutectic mixtures
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The possible fabrication of porous anodic oxide films on aluminium in ionic liquids has been investigated in this study. The study found that the use of choline dihydrogen citrate eutectic mixtures with oxalic acid and isopropyl alcohol and ethylene glycol resulted in the production of compact and uniform anodic alumina layers. The size of the pores and the distance between them were influenced by the electrolyte type and anodisation conditions.
The possible fabrication of porous anodic oxide films on aluminium in ionic liquids based on choline dihydrogen citrate eutectic mixtures both with oxalic acid and isopropyl alcohol and ethylene glycol, has been investigated. The anodisation has been carried out in either potentiostatic or galvanostatic regime, at temperatures of 45-80 degrees C, for different process durations. Quite compact, uniform anodic alumina layers have been obtained. Based on AFM and SEM investigations, pore diameters between 50 and 80 nm and interpore distances in the range of 160-200 nm have been estimated, with values influenced by the electrolyte type and anodisation conditions. The highest anodisation rate of about 0.4 mu m min(-1) has been determined by applying operation temperatures of 60 degrees C. The recorded EIS spectra showed a pure capacitive behaviour and high anodic oxide resistances of 10(6)-10(7) omega cm(2) order.
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