AC and DC study of the temperature effect on mild steel corrosion in acid media in the presence of benzimidazole derivatives

The effect of benzimidazole derivatives on mild steel corrosion in 1 M HCl at five different temperatures has been studied. Impedance, polarization resistance, polarization curves measurement and gravimetric methods have been used. The inhibiting efficiency and the apparent activation energy ( E a)...

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Bibliographic Details
Published in:Corrosion science 2003, Vol.45 (1), p.33-58
Main Authors: Popova, A., Sokolova, E., Raicheva, S., Christov, M.
Format: Article
Language:English
Subjects:
Acidic media
Applied sciences
Corrosion
Corrosion prevention
Electrochemical impedance spectroscopy
Exact sciences and technology
Inhibitors
Metals. Metallurgy
Temperature effect
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Summary:The effect of benzimidazole derivatives on mild steel corrosion in 1 M HCl at five different temperatures has been studied. Impedance, polarization resistance, polarization curves measurement and gravimetric methods have been used. The inhibiting efficiency and the apparent activation energy ( E a) have been calculated in the presence and in the absence of the organic inhibitors. The comparative investigations carried out in 1 M H 2SO 4 and 1 M H 2SO 4+1×10 −4 M KI verify the assumption that the halogen ions facilitate the inhibitors adsorption. The electrostatic absorption of the compound cation form seems more probable. The behaviour of 2-mercaptobenzimidazole (2-SH-BI) contrasts that of the rest of the substances investigated. Chemisorptive adsorption is more probable in this case. The lower value of activation energy E a in the presence of 1-benzyl-benzimidazole when compared to that in 1 M HCl is explained with a partial compensation effect.
ISSN:0010-938X
1879-0496
DOI:10.1016/S0010-938X(02)00072-0