benzimidazole derivatives
carbon steel
acid inhibition
polarization
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This research involves the synthesis of some sulphanyl benzimidazole
derivatives (Ia-c), which were prepared from reaction of 2-mercaptobenzimidazole
substituted benzyl halide, and structures were identified by spectral methods[FTIR,
1H-NMR and 13C-NMR].These compounds were investigated as corrosion inhibitors
for carbon steel in 1M H2SO4 solution using weight loss, potentiostatic polarization
methods; obtained results showed that the sulphanyl benzimidazole derivatives
retard both cathodic and anodic reactions in acidic media, by virtue of adsorption on
the carbon steel surface. This adsorption obeyed Langmuir’s adsorption isotherm.
The inhibition efficiency of (Ia-c) ranging between (65-92) %. By using different Ib
derivative conc
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