Anodic Dissolution and Corrosion of Aluminum in KOH Solutions in 90% Ethanol Containing Additives of Gallium and Indium Compounds. Inhibitory Effect of Citric Acid

Abstract

The effect of citric acid monohydrate additive on the anodic dissolution and corrosion rate of aluminum in the KOH solutions in 90% ethanol containing additives of gallium and indium compounds is considered. It is shown that an addition of citric acid monohydrate to the solution enables reducing the aluminum corrosion current without decreasing its anodic dissolution rate. When 5 × 10^–4 M citric acid monohydrate is introduced into the solution, its inhibition efficiency is 58%. The discharge galvanostatic curves in this electrolyte contain a discharge plateau up to a current density of 16 mA/cm².