الخلاصة

Inhibition of corrosion of iron in hydrochloric acid solutions by theobromine as natural product has been studied using thermometric and galvanometric measurements indicate that the average inhibition efficiency of theobromine at 303ºc ranged from 62.9% to 83.8% and 84.1% to 93.4% respectively. It has been found that theobromine acts as a good corrosion inhibitor for iron in all concentrations of HCl solution. Inhibition was found to increase with increasing concentration of inhibitor. The effects of temperature, immersion time and acid concentration on the corrosion behavior of iron were also studied. The adsorption of theobromine on iron surface obeyed the Langmuir adsorption isotherm. The activation energy as well as other thermodynamic parameters for the inhibition process was calculated.