Study of Inhibitive Effect of 1,4-bis(benzimidazolyl)benzene on Mild Steel Corrosion in 0.5 M HCl and 0.25 M H₂SO₄ Solutions

摘要

The inhibitive effect of bisbenzimidazole compound 1, 4-bis (benzimidazolyl)benzene (BBMB) on thecorrosion of mild steel in 0.5 M HCl and 0.25 M H2SO4 solutions was investigated employing weightloss, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curves methods.The results show that BBMB is a good inhibitor in both acidic media, and exhibits more efficiency in0.5 M HCl solution than that in 0.25 M H2SO4 solution. The adsorption of BBMB on mild steel surfaceobeys Langmuir adsorption isotherm in both acids. Potentiodynamic polarization curves reveal thatBBMB acts as a mixed-type inhibitor through both reducing the anodic mild steel dissolution reactionand retarding the hydrogen evolution reaction.