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The
inhibition efficiency of acetone extract of red onion skin on aluminium
in hydrochloric acid solutions has been evaluated by weight loss
techniques. Values of inhibition efficiency obtained are dependent upon
the concentration of inhibitor and temperature. Generally, inhibition
was found to increase with inhibitor concentration, half-life,
activation energy but decrease with temperature and first-order rate
constant at the temperatures studied. Physical adsorption mechanism has
been proposed for the inhibition and Langmuir adsorption isotherm was
obeyed. The compound responsible for the inhibitory action of red onion
skin is Quercetin. Red onion skin is an inhibitor of aluminium corrosion
in 2 M hydrochloric acid solution.
Key words:
Corrosion inhibition, aluminium, weight loss, red onion skin,
hydrochloric acid. |
