Corrosion inhibition of Eruca sativa leaves extract on C-steel in 0.1 M 
H2SO4 was examined by weight loss and electrochemical techniques. It 
was found that the extract act as a good corrosion inhibitor for the tested 
system. The inhibition efficiency increases with increasing extract 
concentration and decreases with increasing temperature. The adsorption 
of inhibitor on the C-steel surface obeyed Langmuir adsorption isotherm. 
The calculated adsorption thermodynamic parameters indicated that the 
adsorption was spontaneous and exothermic process accompanied by an 
increase in entropy.