Accession Number : ADA119798

Title :   The Behaviour of Al Electrodes in Aqueous Solutions,

Corporate Author : NORWEGIAN DEFENCE RESEARCH ESTABLISHMENT KJELLER

Personal Author(s) : Valand,Torstein

PDF Url : ADA119798

Report Date : Aug 1981

Pagination or Media Count : 84

Abstract : In this work the behaviour of oxide covered A1 electrodes in aqueous solutions is treated. Emphasis is laid on the behaviour at low electrode potentials, ie below approximately -1.0V(SCE). Based on the general theories of passivation developed by KJ Vetter, a thermodynamic treatment of the electrode is reported. Results obtained from experiments with pure and alloyed A1 are given. Usually, the potential step technique was used in these experiments, but other techniques, such as capacity measurements, were also applied. These results are discussed in the light of the thermodynamic treatment, especially when the ion transfer and the oxide formation process is considered. The cathodic hydrogen evolution reaction has been treated by assuming that the step involving electron transfer is rate determining. The effects of oxide thickness and alloying elements on the hydrogen evolution reaction are discussed in accordance with this assumption. In this connection, the effect of separate phases formed on the electrode surface by alloying elements is also discussed. (Author)

Descriptors :   *Electrochemistry, *Aluminum, Electrodes, Aluminum oxides, Foreign technology, Films, Acetates, Acetic acid, Solutions(Mixtures), Defects(Materials), Polarization, Anodic coatings, Ions, Impurities, Passivity, Norway

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE