Abstract:
The aqueous extract of the henna leaves which their specific name is lawsonia (L),
is used as a corrosion inhibitor in controlling corrosion rate of aluminium alloy
(AA5083). This kind of alloy is widely used in marine application. Due to the toxicity of
some corrosion inhibitors, there has been increasing research for green corrosion
inhibitor. Natural inhibitor has rich sources of ingredients which have very high inhibition
efficiency. However, the effectiveness of inhibition action is depending on the
concentration of the inhibitor. The recent finding from other research project verifv that
the inhibition efficiencies increase as the added of henna leaves concentration. The result
from this present study shows the inhibition efficiency increased with the increasing of
henna concentration. The highest percentage of inhibition efficiency (IE %) gained was
95.5 % at 1000 ppm henna. It can be concluded that the use of henna leaves as a corrosion
inhibitor is an accepted practice in order to control the corrosion rate.
