الفهرس 
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Abstract
Generally Inhibitive action of three different commercial surfactants namely SAPDA, LAO, and AEO against the corrosion of carbon steel in a 0.5 M HCl solutions was investigated using weight loss measurments, inductively coupled plasma- atomic emission spectroscopy (ICP-AES), electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR), and potentiodynamic polarization techniques. The investigated surfactants were found to act as effective corrosion inhibitor for the tested system. The polarization data indicated that this surfactants acts as mixed type inhibitor. The inhibition efficiency increased with increasing surfactant concentration and the effect of temperature has been studied by ICP-AES technique and some thermodynamic kinetic parameters ( , , and ) has been calculated, evaluated, and discussed. The adsorption of the surfactants on the CS surface followed the Langmuir adsorption isotherm model. Surface Examination by Scanning Electron Microscope (SEM) for the CS sheet when soaking for five hours in aggressive solution 0.5 M HCl and with the addition of 150 ppm of each investigated surfactants confirm and agree with the results obtain from chemical and electrochemical techniques used. theoretical studies using molecular dynamics simulations software to predict the inhibition effect and found that the theatrical calculation is good matched with experimental results obtained.