Mechanism of inhibition of iron corrosion in hydrochloric acid by benzimidazolium iodides

The inhibitory activity of benzimidazolium salts on iron corrosion in aqueous hydrochloric acid has been studied. The protective effect of the surface-active materials tested is related to blockage of the surface and change of Psi' potential and activation energy due to the electrochemical heterogeneity of the metal surface. A mathematical procedure has been developed for calculating the protective effect of inhibitors and estimating its concentration dependence.