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Benzimidazole derivatives as corrosion inhibitors for zinc in acid solution |
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| Authors: | A. V. Shanbhag T. V. Venkatesha B. M. Praveen |
| Affiliation: | 1. Department of Chemistry, S.D.M. College Honavar, Honavar, 581 334, Karnataka, India 2. Department of P.G. Studies and Research in Chemistry, Kuvempu University, Shankarghatta, 577 451, Karnataka, India 3. Department of Chemistry, Srinivas School of Engineering, Mukka, 575 021, Karnataka, India |
| Abstract: | The corrosion inhibition characteristics of 2-mercapto benzimidazole (MBI), 2-mercapto benzimidazolyl-ethyl acetate (MBEA), 2-hydroxy benzimidazole (HBI) and 2-hydroxy 5-nitro benzimidazole (HNBI) on zinc corrosion in 0.1 M hydrochloric acid were investigated by weight loss and potentiodynamic polarization techniques. The inhibition efficiency increased with increase in inhibitor concentration but decreased with increase in temperature. The adsorption of MBI and MBEA obeyed Langmuir’s adsorption isotherm but HBI and HNBI followed Temkin’s adsorption isotherm. Thethermodynamic functions for adsorption processes were evaluated. The existence of film on metal surface in presence of inhibitors was established by scanning electron microscopy (SEM) images. |
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