Investigation of Benzimidazole Compound as a Novel Corrosion Inhibitor for Mild Steel in Hydrochloric Acid Solution

摘要

The inhibition ability of 1, 4-bis-benzimidazolyl-butane (BBB) on mild steel in 0.5 M HCl solutionwas studied by weight loss measurements, electrochemical techniques and atomic force microscopy(AFM). BBB inhibited mild steel corrosion in 0.5 M HCl solution significantly and the inhibitionefficiency increased with BBB concentration. Potentiodynamic polarization results showed that BBBwas a mixed-type inhibitor. The adsorption of BBB on mild steel surface was strong chemicaladsorption and followed Langmuir adsorption isotherm. Quantum chemical calculation was furtherapplied to reveal the adsorption structure and explain the experimental results. The inhibitionperformance of BBB was also evidenced by AFM images.