Development of a strict kinetic model for the growth of porous anodic Al2O3 films on aluminium

Patermarakis, G; Tzouvelekis, D

dc.contributor.author	Patermarakis, G	en
dc.contributor.author	Tzouvelekis, D	en
dc.date.accessioned	2014-03-01T01:09:50Z
dc.date.available	2014-03-01T01:09:50Z
dc.date.issued	1994	en
dc.identifier.issn	0013-4686	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/11200
dc.subject	aluminium	en
dc.subject	anodizing	en
dc.subject	growth	en
dc.subject	kinetics.	en
dc.subject	oxide	en
dc.subject	porous	en
dc.subject.classification	Electrochemistry	en
dc.subject.other	Alumina	en
dc.subject.other	Anodic oxidation	en
dc.subject.other	Current density	en
dc.subject.other	Dissolution	en
dc.subject.other	Electrolytes	en
dc.subject.other	Growth kinetics	en
dc.subject.other	Models	en
dc.subject.other	Porosity	en
dc.subject.other	Porous materials	en
dc.subject.other	Sulfuric acid	en
dc.subject.other	Critical electrolyte concentration	en
dc.subject.other	Galvanostatic anodization	en
dc.subject.other	Surface area	en
dc.subject.other	Film growth	en
dc.title	Development of a strict kinetic model for the growth of porous anodic Al2O3 films on aluminium	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/0013-4686(94)00203-7	en
heal.identifier.secondary	http://dx.doi.org/10.1016/0013-4686(94)00203-7	en
heal.language	English	en
heal.publicationDate	1994	en
heal.abstract	A strict kinetic model, governing the growth of porous anodic Al2O3 films, was developed in a form easily and directly applicable to a galvanostatic anodization in a stirred bath at constant temperature. It was applied to the experimental results obtained from film growth at 25 degrees C, 15 mA cm(-2) and in a wide range of H2SO4 concentrations from 2 to 105% w/v. Its application provided, consistently with other experimental evidence, that a critical electrolyte concentration exists between 5 and 15% w/v. Above the critical concentration the normal mechanism of oxide production and film growth is valid and the model applies; below the critical concentration, where the model does not apply, a deficient growth of the oxide is observed. The experimental results and their treatment by the developed model showed that the electrolyte concentration generally affects parameters such as the weight and porosity of the film, the pore base hemispherical surface area, the time at which the pore external diameter approaches cell width, the time interval in which the model applies, the parameters involved in the developed kinetic model, etc. Their variation with electrolyte concentration was well justified by the fact that the rate of the dissolution of the anodic Al2O3 in an open circuit has a maximum at a specific concentration and the electrolyte concentration is variable along pores being maximum at pore bases.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Electrochimica Acta	en
dc.identifier.doi	10.1016/0013-4686(94)00203-7	en
dc.identifier.isi	ISI:A1994PY46800013	en
dc.identifier.volume	39	en
dc.identifier.issue	16	en
dc.identifier.spage	2419	en
dc.identifier.epage	2429	en