Solid surface and field catalysed interface formation of colloidal Al2(SO4)3 during Al anodizing affecting the kinetics and mechanism of development and structure of porous oxides

Patermarakis, G; Moussoutzanis, K

dc.contributor.author	Patermarakis, G	en
dc.contributor.author	Moussoutzanis, K	en
dc.date.accessioned	2014-03-01T01:18:21Z
dc.date.available	2014-03-01T01:18:21Z
dc.date.issued	2002	en
dc.identifier.issn	1432-8488	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14949
dc.subject	Field and solid surface catalysis	en
dc.subject	Interface colloidal aluminum sulfate	en
dc.subject	Kinetics mechanism and structure	en
dc.subject	Porous anodic alumina	en
dc.subject.classification	Electrochemistry	en
dc.subject.other	aluminum	en
dc.subject.other	electrolyte	en
dc.subject.other	oxide	en
dc.subject.other	sulfate	en
dc.subject.other	sulfuric acid	en
dc.subject.other	article	en
dc.subject.other	catalysis	en
dc.subject.other	chemical modification	en
dc.subject.other	chemical reaction kinetics	en
dc.subject.other	chemical structure	en
dc.subject.other	colloid	en
dc.subject.other	density	en
dc.subject.other	electrochemical analysis	en
dc.subject.other	porosity	en
dc.subject.other	potentiometry	en
dc.subject.other	solid state	en
dc.subject.other	theory	en
dc.subject.other	thermodynamics	en
dc.title	Solid surface and field catalysed interface formation of colloidal Al2(SO4)3 during Al anodizing affecting the kinetics and mechanism of development and structure of porous oxides	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/s10008-001-0253-4	en
heal.identifier.secondary	http://dx.doi.org/10.1007/s10008-001-0253-4	en
heal.language	English	en
heal.publicationDate	2002	en
heal.abstract	Overall kinetic and potentiometric studies of the growth of porous anodic alumina films in saturated H2SO4 + Al-2(SO4)(3) electrolyte showed non-saturation conditions inside the pores and supersaturation conditions at the pore surface/electrolyte interface where the field and the solid surface catalyse the formation of colloidal Al-2(SO4)(3) micelles. Suitable high-strength field thermodynamically sustained electrochemical and chemical kinetic equations were formulated. It was shown that the diameter and surface fraction of charge exchange at the pore bases, the real pore wall surface fraction where oxide dissolution occurs, and its rate are strongly affected by the conditions. The mechanism of growth and structure of the films are quite different from those in H2SO4. A mechanism of regular film growth is imposed and the critical current density, above which pitting appears, strongly increases. The formulated theory may predict improved or new Al anodizing technologies.	en
heal.publisher	SPRINGER-VERLAG	en
heal.journalName	Journal of Solid State Electrochemistry	en
dc.identifier.doi	10.1007/s10008-001-0253-4	en
dc.identifier.isi	ISI:000178151600006	en
dc.identifier.volume	6	en
dc.identifier.issue	7	en
dc.identifier.spage	475	en
dc.identifier.epage	484	en