Inhibiting effect of 2-mercaptobenzimidazole on the corrosion of Cu–30Ni alloy in aerated 3% NaCl in presence of ammonia

The inhibiting effect of 2-mercaptobenzimidazole (MBI) against Cu–30Ni alloy corrosion in aerated 3% NaCl polluted by ammonia, has been developed. Potentiodynamic and electrochemical impedance spectroscopy (EIS) measurements have been applied to determine the corrosion rate. scanning electron microscopy (SEM) studied surface morphology has been used to characterise electrode surface. The obtained results indicate that MBI acts as a good mixed-type inhibitor retarding the anodic and cathodic reactions. An increase of MBI concentration leads to a decrease of corrosion rate and inhibition efficiency increase.