The inhibitive action of the aqueous extract of Salvadore persica
toward acid corrosion of aluminum is tested using weight loss, 
thermometry, hydrogen evolution, polarization techniques and 
FTIR spectroscopy. It was found that the extract acts as a good 
corrosion inhibitor for aluminum corrosion in 2M HCl solution. 
The inhibition action of the extract was discussed in view of 
Langmuir adsorption isotherm. It was found that the adsorption of 
the extract on aluminum surface is a spontaneous process. The 
inhibition efficiency (ƞ %) increases as the extract concentration is 
increased. The effect of temperature on the (ƞ %) was studied. It 
was found that the presence of extract increases the activation 
energy of the corrosion reaction.