CORROSION INHIBITION OF STEEL IN ACIDIC MEDIA BY BENZIMIDAZOLE DERIVATIVES

摘要

In connection with the use of substituted benzimidazoles as inhibitors of acid corrosion of mild steel, attention was turned to the influence of structure and composition of homologous series of benzimidazole derivatives. The protective effects of substituted benzimidazoles on the corrosion of mild steel in 1M HCl were studied using weight loss and polarisation techniques. The results of the investigation show that all investigated benzimidazole derivatives have fairly good inhibiting properties for steel corrosion in hydrochloric acid. The compound 2,2'-Octamethylenebis-benzimidazole (III) is the best inhibitor and its inhibition efficiency reaches (94%) at 10~(-4) M in 1M acid concentration.