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Examination of the metastable and stable pitting corrosion of aluminum modified with carbon by ion beam techniques

Lensch, O. and Enders, B. and Knecht, J. and Ensinger, W. (2001):
Examination of the metastable and stable pitting corrosion of aluminum modified with carbon by ion beam techniques.
In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Elsevier, pp. 683-687, (175-177), ISSN 0168583X, [Online-Edition: http://dx.doi.org/10.1016/S0168-583X(01)00373-1],
[Article]

Abstract

It is well known that aluminum and aluminum alloys are sensitive to pitting corrosion when exposed to aqueous solutions containing aggressive anions like halides. The destructive nature of pitting is due to its high local dissolution rates at electrode potentials above the so-called pitting potential Up. Recently, it has been realized that also at potentials below Up, in the passive and cathodic regions and around the free corrosion potential, anodic current transients appear which have been attributed to metastable pitting events. For the purpose of full characterization of the pitting behavior, a program routine has been developed where the occurrence frequency, lifetime and rate of metastable pitting events are extracted from potentiostatic current/time-measurements depending on the electrode potential. The routine has been applied to measurements of carbon modified pure aluminum. Carbon modifications were done with carbon evaporation and carbon sputtering under concurrent argon ion bombardment. The results are discussed in terms of the applied modification technique, their parameters and their effects on the corrosion protection ability of aluminum modified by carbon.

Item Type: Article
Erschienen: 2001
Creators: Lensch, O. and Enders, B. and Knecht, J. and Ensinger, W.
Title: Examination of the metastable and stable pitting corrosion of aluminum modified with carbon by ion beam techniques
Language: English
Abstract:

It is well known that aluminum and aluminum alloys are sensitive to pitting corrosion when exposed to aqueous solutions containing aggressive anions like halides. The destructive nature of pitting is due to its high local dissolution rates at electrode potentials above the so-called pitting potential Up. Recently, it has been realized that also at potentials below Up, in the passive and cathodic regions and around the free corrosion potential, anodic current transients appear which have been attributed to metastable pitting events. For the purpose of full characterization of the pitting behavior, a program routine has been developed where the occurrence frequency, lifetime and rate of metastable pitting events are extracted from potentiostatic current/time-measurements depending on the electrode potential. The routine has been applied to measurements of carbon modified pure aluminum. Carbon modifications were done with carbon evaporation and carbon sputtering under concurrent argon ion bombardment. The results are discussed in terms of the applied modification technique, their parameters and their effects on the corrosion protection ability of aluminum modified by carbon.

Journal or Publication Title: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
Number: 175-177
Publisher: Elsevier
Uncontrolled Keywords: Ion beam assisted deposition, Ion beam assisted sputtering, Carbon coating, Aluminum, Corrosion protection, Metastable and stable pitting corrosion
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Material Analytics
Date Deposited: 26 Jun 2012 07:36
Official URL: http://dx.doi.org/10.1016/S0168-583X(01)00373-1
Identification Number: doi:10.1016/S0168-583X(01)00373-1
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