Aluminium anodising in ultra-dense sulfate baths: Discovery by overall kinetic and potentiometric studies of the critical role of interface colloidal Al2(SO4)3 nanoparticles in the mechanism of growth and nanostructure of porous oxide coatings

Patermarakis, G; Moussoutzanis, K

dc.contributor.author	Patermarakis, G	en
dc.contributor.author	Moussoutzanis, K	en
dc.date.accessioned	2014-03-01T01:21:48Z
dc.date.available	2014-03-01T01:21:48Z
dc.date.issued	2005	en
dc.identifier.issn	1432-8488	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16379
dc.subject	Film growth mechanism	en
dc.subject	Interface colloidal Al2(SO4)3	en
dc.subject	Nanostructure	en
dc.subject	Porous anodic aluminas	en
dc.subject	Ultra-dense sulfate baths	en
dc.subject.classification	Electrochemistry	en
dc.subject.other	Coating techniques	en
dc.subject.other	Concentration (process)	en
dc.subject.other	Current density	en
dc.subject.other	Electrolytes	en
dc.subject.other	Film growth	en
dc.subject.other	Micelles	en
dc.subject.other	Nanostructured materials	en
dc.subject.other	Film growth mechanism	en
dc.subject.other	Interface colloidal Al2(SO4)3	en
dc.subject.other	Porous anodic aluminas	en
dc.subject.other	Ultra-dense sulfate baths	en
dc.subject.other	Aluminum compounds	en
dc.title	Aluminium anodising in ultra-dense sulfate baths: Discovery by overall kinetic and potentiometric studies of the critical role of interface colloidal Al2(SO4)3 nanoparticles in the mechanism of growth and nanostructure of porous oxide coatings	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/s10008-004-0568-z	en
heal.identifier.secondary	http://dx.doi.org/10.1007/s10008-004-0568-z	en
heal.language	English	en
heal.publicationDate	2005	en
heal.abstract	The solubility of Al2(SO4)3 in H 2SO4 at different concentrations was determined and showed a minimum at ≈95% w/v. Overall kinetic and potentiometric studies of Al anodising were performed in large ranges of concentrations of saturated H 2SO4 solutions and current densities. During anodising quasi-steady-state supersaturation and unsaturation conditions for concentrations below and above 95% w/v dominate in the pore-filling solution affecting those in the oxide-electrolyte interface. Interface colloidal Al 2(SO4)3 nanoparticles form occupying surface fractions increasing with salt concentration, supersaturation, field strength in the pore base surface and current density increase and temperature decrease. These control the mechanism and kinetics of growth and structural parameters of films and impose the growth of non-pitted uniform films up to current densities higher than in unsaturated baths, more effectively under supersaturation conditions. Well-defined peaks of structural parameters appear depending on thickness and current. Thus optimal regularly grown films of desired nanostructure and the introduction of new anodising technologies can be achieved. © Springer-Verlag 2004.	en
heal.publisher	SPRINGER	en
heal.journalName	Journal of Solid State Electrochemistry	en
dc.identifier.doi	10.1007/s10008-004-0568-z	en
dc.identifier.isi	ISI:000228729300006	en
dc.identifier.volume	9	en
dc.identifier.issue	4	en
dc.identifier.spage	205	en
dc.identifier.epage	233	en