Inhibition of the C38 steel corrosion by mean of N-1-Naphthylethylenediamine Dihydrochloride Monomethanolate (N-NEDHME), was studied in 0.5M H2SO4 solutions in the temperature range from 298K to 328K using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The results obtained from the both measurement techniques revealed good inhibitor efficiency in the studied concentration range. The inhibition efficiency decrease with rise in temperature. Impedance measurements showed that the doublelayer capacitance decreased and charge-transfer resistance increased with increase in the inhibitor concentration and hence increasing in inhibition efficiency. Polarization curves show that N-NEDHME is a anodic-type inhibitor. The results obtained from the different methods are in good agreement. Adsorption followed the Langmuir isotherm with negative values of DGa°ds , suggesting a stable and a spontaneous inhibition process.
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