Aluminium anodising in oxalate and sulphate solutions. Comparison of chronopotentiometric and overall kinetic response of growth mechanism of porous anodic films

Patermarakis, G; Masavetas, K

dc.contributor.author	Patermarakis, G	en
dc.contributor.author	Masavetas, K	en
dc.date.accessioned	2014-03-01T01:23:33Z
dc.date.available	2014-03-01T01:23:33Z
dc.date.issued	2006	en
dc.identifier.issn	0022-0728	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17020
dc.subject	Al anodising	en
dc.subject	Chronopotentiomety	en
dc.subject	Kinetics	en
dc.subject	Mechanism	en
dc.subject	Oxalate/sulphate solutions	en
dc.subject.classification	Chemistry, Analytical	en
dc.subject.classification	Electrochemistry	en
dc.subject.other	Aluminum	en
dc.subject.other	Dissolution	en
dc.subject.other	Electrolytes	en
dc.subject.other	Micelles	en
dc.subject.other	Reaction kinetics	en
dc.subject.other	Saturation (materials composition)	en
dc.subject.other	Al anodizing	en
dc.subject.other	Chronopotentiometry	en
dc.subject.other	Oxalate/sulphate solutions	en
dc.subject.other	Anodic oxidation	en
dc.title	Aluminium anodising in oxalate and sulphate solutions. Comparison of chronopotentiometric and overall kinetic response of growth mechanism of porous anodic films	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.jelechem.2005.12.021	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.jelechem.2005.12.021	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	Aluminium anodising was performed in saturated and unsaturated H2C2O4 solutions and in H2SO4 and saturated H2SO4 + Al-2(SO4)(3) solutions at similar temperatures, concentrations and current density to reveal the effect of anions and condensed electrolyte nanoparticle micelles formed on pore base and wall surfaces on the mechanism of growth of porous anodic alumina films. Chronopotentiometry and overall kinetics showed that the kinetics and mechanism of growth and nanostructure of films are similar in oxalate and sulphate solutions. But differences also appear, like higher field strength across the barrier layer and much lower pore wall dissolution rate in oxalate solutions. These are attributed to dissimilar kind of anions, smaller amount of incorporated ones and depth of penetration in barrier layer and pore walls during the film growth in oxalate solutions and to their participation in a step of oxide dissolution mechanism that becomes the rate controlling in this case. In saturated solutions the condensed H2C2O4 and Al-2(SO4)(3) micelles affect the kinetics and mechanism of film growth., more H2C2O4, allowing a better design of structure. Results promote the knowledge on growth mechanism and kinetics of anodic films enabling methods to optimise the structure for their many scientific or technological applications. (c) 2006 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE SA	en
heal.journalName	Journal of Electroanalytical Chemistry	en
dc.identifier.doi	10.1016/j.jelechem.2005.12.021	en
dc.identifier.isi	ISI:000236310600003	en
dc.identifier.volume	588	en
dc.identifier.issue	2	en
dc.identifier.spage	179	en
dc.identifier.epage	189	en