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LEDNICKÝ, T. MOZALEV, A.
Original Title
Effect of pretreatment parameters on the anodizing behaviour of Al foils in citric acid electrolytes
Type
conference paper
Language
English
Original Abstract
Nanoporous anodic alumina films grown in citric acid electrolytes at poten- tials exceeding 300V are of considerable interest both for applications in electronics and as models for studying film formation at frontier conditions [1]. However, a reproducible anodic process for steady-state alumina growth at moderate current densities remains a challenge due to the diffi- culty to reveal and maintain the right balance between the technological, electrical and electrolytic conditions for anodizing and pre-anodizing treat- ments. Here we demonstrate the impact of important surface finishing techniques for Al foils, such as annealing and electropolishing, on the pore nucleation and growth during galvanostatic anodization in citric acid elec- trolytes. It was revealed that the self-organized pore formation is strictly dependent upon the anodizing setup, the surface morphology and crystalline struc- ture of aluminium foils, which are affected by the conditions of high tem- perature annealing and electropolishing pretreatments. The optimized pro- cess parameters give microscopically flat sample surfaces, without the usual textures of nanometre dimensions [2], which plays a role in the elec- trochemical behaviour of Al and its response to further anodizing. The new knowledge gained in this work is useful for creating advanced processes for growing well-distanced, individual or multiplied nanopores, grouped in a customary way, with and without applying an external tech- nique, for templated formation of metal-oxide nanostructures. This work was supported by GA ČR grant no. 14-29531S. References [1] A. Mozalev et al., Electrochim. Acta, 50 (2005) 5065-5075. [2] C.E. Caicedo-Martinez et al., Surf. Interface Anal. 34 (2002) 405–408.
Keywords
anodizing, aluminium, pretreatment, citric acid, alumina
Authors
LEDNICKÝ, T.; MOZALEV, A.
RIV year
2015
Released
22. 4. 2015
Publisher
Masaryk University
Location
Brno
ISBN
978-80-210-7825-3
Book
CEITEC PhD Retreat, 23-24 April 2015, Valtice, Czech Republic
Edition
1.
Edition number
1
Pages from
100
Pages to
Pages count
135
BibTex
@inproceedings{BUT119099, author="Tomáš {Lednický} and Alexander {Mozalev}", title="Effect of pretreatment parameters on the anodizing behaviour of Al foils in citric acid electrolytes", booktitle="CEITEC PhD Retreat, 23-24 April 2015, Valtice, Czech Republic", year="2015", series="1.", number="1", pages="100--100", publisher="Masaryk University", address="Brno", isbn="978-80-210-7825-3" }