Formation of self-ordered nano-tubular structure of anodic oxide layer on titanium

Room temperature anodization of titanium foil specimens was carried out in 0.5 M phosphoric acid solution with addition of various halide ions. Addition of 0.138 M HF or NaF resulted in self-ordered nano-tubular oxide structure. Addition of bromide and chloride ions initiated only pitting and nano-p...

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Bibliographic Details
Published in:Electrochimica acta 2005-10, Vol.51 (1), p.154-165
Main Authors: Raja, K.S., Misra, M., Paramguru, K.
Format: Article
Language:English
Subjects:
Anodization
Applied sciences
Corrosion
Corrosion mechanisms
Exact sciences and technology
Metals. Metallurgy
Nano-porous oxide
Titanium oxide
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Summary:Room temperature anodization of titanium foil specimens was carried out in 0.5 M phosphoric acid solution with addition of various halide ions. Addition of 0.138 M HF or NaF resulted in self-ordered nano-tubular oxide structure. Addition of bromide and chloride ions initiated only pitting and nano-pores were not observed during anodization. Acidified fluoride solution is found to be necessary to obtain ordered nano-structure as neutral fluoride solution did not form nano-pores. Instability of the oxide layer during anodization and formation of the self-ordered structure can be explained by the perturbation theory. Separation of individual nano-tubes of titanium oxide layer from the inter-connected nano-pores could be attributed to the possible repulsion forces of the cation vacancies.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2005.04.011