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Role of indium ions on the activation of aluminium

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Abstract

The effect of indium ions on the dissolution of aluminium in chloride solutions as well as the role of impurities normally present were investigated. Electrochemical techniques complemented by SEM and EDAX were utilized for two types of aluminium, AlI(99.999%) and AlII(99.61%). The activation process depends on the chloride ion concentration as well as the surface finish of the samples. Activation is attributed to deposition of In at the surface forming In–Al alloy which is responsible for Cl− ion adsorption at high negative potentials (i.e., activation). Deactivation was exhibited in the case of AlII due to the presence of Fe as an impurity. The effect of addition of Fe3+ alone, and together with In3+, on the activation of AlI in 0.6m NaCl was also examined.

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Authors and Affiliations

  1. Electrochemistry and Corrosion Laboratory, National Research Centre, Dokki, Cairo, Egypt

    H. A. El Shayeb, F. M. Abd El Wahab & S. Zein El Abedin

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  1. H. A. El Shayeb
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  2. F. M. Abd El Wahab
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  3. S. Zein El Abedin
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Shayeb, H.A.E., Wahab, F.M.A.E. & Abedin, S.Z.E. Role of indium ions on the activation of aluminium. Journal of Applied Electrochemistry 29, 601–609 (1999). https://doi.org/10.1023/A:1003593405099

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