Effect of the anodization conditions on the growth and volume expansion of porous alumina films in malonic acid electrolyte

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F15%3APU117146" target="_blank" >RIV/00216305:26620/15:PU117146 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1016/j.surfcoat.2015.04.030" target="_blank" >http://dx.doi.org/10.1016/j.surfcoat.2015.04.030</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.surfcoat.2015.04.030" target="_blank" >10.1016/j.surfcoat.2015.04.030</a>

Result language

angličtina

Original language name

Effect of the anodization conditions on the growth and volume expansion of porous alumina films in malonic acid electrolyte

Original language description

Galvanostatic formation of nanoporous anodic films on aluminumwas performed in 0.6 M malonic acid electrolyte over a wide current density range in order to define the relationship between the anodizing behavior, oxide growth, dissolution and volume expansion of the oxide. The volume expansion and aluminum dissolution increase with raising the current density, the latter indicating an increasing potential difference across the electrolyte/barrier-layer interface. The same potential difference promotes dissociation of the acid molecules and incorporation of electrolyte-derived species into the film. The increase of volume expansion occurs in three phases, resulting fromthe two dissociation steps of malonic acid and from the change in the oxide growth mechanism at higher current densities. Infrared spectroscopy showed an enhanced presence of OH in films formed at higher current densities, indicating that lower coordination of aluminumaswell as anion incorporation contributes to volume expansion of the oxide. The current appeared to be 100% ionic in the interval of 5–100 mA cm-2, while being about 10% electronic beyond this range. At higher current densities a selflocalizing mechanism concentrates the ionic current to a smaller, spot-like area that moves continuously along the sample consuming steadily the whole metal thickness under the spot and thus forming a porous anodic film of highly self-ordered morphology, without physical imperfections. The volume expansion factor of the oxide becomes independent of the anodization current density under these conditions

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Project

<a href="/en/project/GA14-29531S" target="_blank" >GA14-29531S: Formation and properties of novel self-organized mixed-oxide 3-D nanostructured films for use in advanced microdevices (AnoNanoFilm)</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2015

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Surface and Coatings Technology

ISSN

0257-8972

e-ISSN

—

Volume of the periodical

275

Issue of the periodical within the volume

1

Country of publishing house

CH - SWITZERLAND

Number of pages

8

Pages from-to

18-25

UT code for WoS article

000357753900004

EID of the result in the Scopus database

2-s2.0-84930863806