Dissolution behavior of metallic zinc in organic acid

Year 2018, Volume: 1 Issue: 3, 11 - 18, 01.07.2018

İkram Boukerche Souad Djerad Rima Larba Leila Benmansour Lakhdar Tifouti

Abstract

A series of experiments
were conducted to examine the effect of citric acid on the dissolution of
zerovalent zinc. The effects of citric acid concentration, the presence of
anions and temperature were studied. The results have shown that zinc
dissolution registered a maximum of 34% with 0.5M citric acid after 270 min and
that the nature of anions present with citric acid affected differently the
dissolution rate. In fact, the presence of 2M nitrates with 0.5M citric acid
dissolved totally zinc after 30min while 91.85% and 13.15% were dissolved in
the presence of 2M chlorides and sulfates respectively after 270min. SEM
analyses have shown that the morphology of the corroded surface depended on the
composition of the solution. The kinetic study has shown that zinc dissolution
was controlled by the chemical reaction in all cases and that the activation
energy was 39.3 kJ mol^-1.

Keywords

Zinc; Citric acid; Dissolution; Concentrated conditions; Nitrates; Pollution.

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