A new corrosion inhibitor, namely diethyl 2-(2-oxopyrrolidin-1-yl) ethyl phosphonate (P1) was synthesized and its action on the corrosion of steel in 0.5 M H2SO4 solution has been studied. Weight loss measurements, potentiodynamic polarisation and linear polarisation resistance (Rp) and impedance spectroscopy (EIS) methods have been used. The inhibition efficiency increases with the concentration of P1 to attain 86% at 5.10-3 M. We have noted a good agreement between gravimetric and electrochemical methods (potentiodynamic and Rp polarisation and impedance spectroscopy (EIS)). Polarisation measurements show also that the pyrrolidone derivative acts essentially as a cathodic inhibitor. The cathodic curves indicate that the reduction of proton at the steel surface is an activating mechanism. P1 adsorbs on the steel surface according to Langmuir adsorption model. Effect of temperature is also studied in the 298-353 K range.
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