Anodic dissolution and corrosion of Al in KOH solutions in 90% ethanol containing additives of gallium and indium compounds. Inhibitory effect of citric acid

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Abstract

The influence of addition of citric acid monohydrate on anodic dissolution and corrosion rate of aluminium in KOH solutions in 90% ethanol containing additives of gallium and indium compounds has been considered. It is shown that the introduction of citric acid monohydrate into the solution allows to reduce the magnitude of aluminium corrosion current without reducing the rate of its anodic dissolution. The inhibition efficiency of citric acid monohydrate when introduced into the solution at a concentration of 5∙10–4 M is 58%. The discharge galvanostatic curves in the above electrolyte show a flat discharge plateau up to a discharge current density of 16 mA/cm2.

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About the authors

K. V. Rybalka

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences

Author for correspondence.
Email: mamaison2000@yandex.ru
Russian Federation, Moscow

L. A. Beketaeva

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences

Email: mamaison2000@yandex.ru
Russian Federation, Moscow

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2. Fig. 1. Galvanostatic discharge curves on an Al electrode in a 2 M KOH solution in 90% ethanol containing 10–4 M Ga3+ and 10–3 M In3+ at different current densities.

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3. Fig. 2. Dependencies: (a) the amount of electricity spent on the release of hydrogen on Al, (b) the corrosion current density of Al, on the time it is kept in a 2 M KOH solution in 90% ethanol containing 10–4 M Ga3+ and 10–3 M In3+ and the addition of citric acid monohydrate.

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4. Fig. 3. Galvanostatic discharge curves on an Al electrode in a 2 M KOH solution in 90% ethanol containing 10–4 M Ga3+, 10–3 M In3+ and 5∙10–4 M citric acid monohydrate, at different current densities.

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