Discovery by kinetic studies of the latent physicochemical processes and their mechanisms during the growth of porous anodic alumina films in sulfate electrolytes

Patermarakis, G; Moussoutzanis, K; Chandrinos, J

dc.contributor.author	Patermarakis, G	en
dc.contributor.author	Moussoutzanis, K	en
dc.contributor.author	Chandrinos, J	en
dc.date.accessioned	2014-03-01T01:16:25Z
dc.date.available	2014-03-01T01:16:25Z
dc.date.issued	2001	en
dc.identifier.issn	14328488	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/14041
dc.subject	Aluminum anodizing	en
dc.subject	Latent physicochemical processes	en
dc.subject	Mechanisms	en
dc.subject	Porous oxide growth kinetics	en
dc.subject	Sulfate electrolytes	en
dc.title	Discovery by kinetic studies of the latent physicochemical processes and their mechanisms during the growth of porous anodic alumina films in sulfate electrolytes	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/s100080000176	en
heal.identifier.secondary	http://dx.doi.org/10.1007/s100080000176	en
heal.publicationDate	2001	en
heal.abstract	The kinetics of growth of porous anodic alumina films in pure H2SO4, in mixtures of H2SO4 and Al2(SO4)3 and in Al(HSO4)3, NaHSO4 and KHSO4 electrolytes were studied. The latent physicochemical processes at the pore base surface/electrolyte interface, across the barrier layer, inside the metal/oxide interface and at the pore wall surface/electrolyte interface and their mechanisms were revealed. High field strength equations were formulated describing the ionic migrations from the pore base surface. These showed that, at constant current density and temperature, the inverse of the pore base square diameter depends linearly on the inverse of the H+ activity in the anodizing solution and that this diameter increases with H+ activity, in agreement with the experimental results. The mechanism of electrolyte anion incorporation inside the barrier layer and the real distribution of the anion concentration across both the barrier layer and pore walls were deduced. The effects of the different kinds and concentrations of the electrolyte anions and cations on both the above processes and their mechanisms were also examined.	en
heal.journalName	Journal of Solid State Electrochemistry	en
dc.identifier.doi	10.1007/s100080000176	en
dc.identifier.volume	6	en
dc.identifier.issue	1	en
dc.identifier.spage	39	en
dc.identifier.epage	54	en