Cambios en la morfología de las capas anódicas porosas de óxido de aluminio durante el envejecimiento en ambientes naturales y artificiales

V. López; E. Otero; A. Bautista; E. Escudero; J. A. González

doi:10.3989/revmetalm.2003.v39.iExtra.1105

Changes in the morphology of porous anodic films formed on aluminium in natural and artificial ageing

Authors

V. López Centro Nacional de Investigaciones Metalúrgicas (CENIM), (CSIC)
E. Otero Centro Nacional de Investigaciones Metalúrgicas (CENIM), (CSIC)
A. Bautista Centro Nacional de Investigaciones Metalúrgicas (CENIM), (CSIC)
E. Escudero Centro Nacional de Investigaciones Metalúrgicas (CENIM), (CSIC)
J. A. González Centro Nacional de Investigaciones Metalúrgicas (CENIM), (CSIC)

DOI:

https://doi.org/10.3989/revmetalm.2003.v39.iExtra.1105

Keywords:

Anodized aluminium, Sealing, Ageing, Transmission electron microscopy, Electrochemical impedance spectroscopy

Abstract

Transmission electron microscopy and electrochemical impedance spectroscopy are used to demonstrate that the water retained in porous anodic aluminium oxide films is the main reason for their reactivity under electron beam irradiation in the TEM, accelerated ageing in an oven at 100 °C, or natural ageing over months and years in an outdoor atmosphere. Though the kinetics in each medium is highly different, there is a clear similarity between the structural and physical-chemical transformations that take place. Unsealed layers, practically free of water, hardly change their structure under the effect of electron beams and show the same impedance plots after hours at 100 °C or after years at environmental temperature in dry atmospheres.

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Published

2003-12-17

How to Cite

López, V., Otero, E., Bautista, A., Escudero, E., & González, J. A. (2003). Changes in the morphology of porous anodic films formed on aluminium in natural and artificial ageing. Revista De Metalurgia, 39(Extra), 104–109. https://doi.org/10.3989/revmetalm.2003.v39.iExtra.1105

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Issue

Vol. 39 No. Extra (2003)

Section

Articles

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