الفهرس 
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Abstract
The present work is assigned to study the corrosion behavior of carbon steel in 1 M HCl and the inhibiting effect of some organic compounds (Chalcone). These studies were carried out using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy and electrochemical frequency modulation. The obtained results showed that the inhibition efficiency of these compounds increased by increasing their concentrations and decreased by increasing temperature. This indicate that these compounds adsorbed on carbon steel physically and they found to obey Langmuir adsorption isotherm. The data showed that these compounds behave as mixed type inhibitors. Some thermodynamic parameters are computed and discussed. All these different techniques gave similar results which indicate that these techniques are adequate for the measurements.