New non ionic polymeric surfactants as corrosion inhibitors for the C- Steel alloy in hydrochloric acid corrosive medium

Ethoxylation of N-(2-hydroxyethyl) oleiamides,(HA) using Polyethylene Glycol (PEG) in the presence of linking agent and catalyst to give the corresponding amido poly ethelene oxide (AP10000) which separated and characterized by FT-IR, 1HNMR and 13 CNMR the corrosion inhibition characteristics of amidopoly ethelene oxide (AP10000) as nonionic polymeric surfactants has been evaluated as a corrosion inhibitor for steel in aerated 2.0 M HCl by weight loss, open circuit potential and potentiodynamic polarization. Effect of temperatures and concentrations on the corrosion rate was also determined. It was found that the inhibition efficiency increased with inhibitor concentration and decrease with temperature. Adsorption was found to follow the Langmuir isotherm. Inhibition efficiency obtained from both polarization and weight loss measurements are in a good agreement. The obtained polarization curves indicate that these compounds act as mixed-type inhibitors. In fact addition of inhibitors molecules to the corrosive medium produces a negative shift in the open circuit potential due to the retardation of the cathodic reaction. Thermodynamics activation parameters were computed

Author(s): R.S.Abdel Hameed ; Omar.M.Ismaile; Fayez M. Eissa ; and, Raed.Ghanem

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