Abstract
The effect of Almadinah Almonawarah soil solution on the corrosion of steel in 2 M H2SO4 was studied using chemical (gravimetric and gasometric) techniques at 30 and 60 degrees C and electrochemical (impedance and polarization) techniques at 30 degrees C. The results revealed that the studied soil solution inhibits the corrosion of steel in acid media and the inhibition efficiency increase with increasing concentration of soil solution but decrease with rising temperature. Polarization showed that Almadinah Almonawarah soil solution acts as mixed type inhibitor. The experimental data were corroborated with the Freundlish as well as Langmuir adsorption isotherms. The values of activation energy suggest that the inhibition process is activation controlled.