Abstract
The electrochemical investigations of corrosion behavior of mild steel in sulfuric acid solution in presence and absence of different concentration of Ethylene-1,1′-dimethyl-4,4′-bipyridinium iodide (Edpi) at different temperatures were performed. The measurement of potentiodynamic polarization revealed that (Edpi) act as mixed type inhibitor with predominated of anodic effect. It was shown the adsorption process obeyed Langmuir adsorption isotherm and the inhibition efficiency increased with increased (Edpi) concentration and decreased with rise of temperatures. The effect of immersion time in Rp was studied, and the decreased of Rp with time suggest a deficiency in adsorbed film with long immersion time.