Abstract
The corrosion behavior of carbon steel in 1MHCl solution in the absence and presence of three compounds of ethoxylated fatty amide was studied using weight loss and galvanostatic polarization techniques. The percentage inhibition efficiency was found to increase with increasing of inhibitor concentrations, number of ethylene oxide unit and with decreasing temperature. The inhibitive action of these compounds was discussed in term of adsorption on the steel surface through ethylene oxide unit while the hydrocarbon parts protrude brush-like into the solution. The adsorption process follows Langmuir adsorption isotherm. The effect of temperature on the rate of corrosion in the absence and presence of these compounds was also studied. Some activated thermodynamic parameters were calculated.