Corrosion inhibition of carbon-steel with 2-mercaptobenzimidazole in hydrochloric acid

P Morales-Gil, M S Walczak, C Ruiz Camargo, R A Cottis, J M Romero, R Lindsay

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    Electrochemical measurements and substrate analysis have been employed to probe the corrosion inhibition performance of 2-mercaptobenzimidazole (MBI) for carbon-steel in 1 M, 0.1 M, and 0.01 M HCl. Data demonstrate that the inhibition efficiency of MBI is essentially independent of HCl concentration. Moreover, it is concluded that the presence of MBI impedes the cathodic reduction of dissolved O2 to a lesser extent than H+. X-ray photoelectron spectra indicate that substrate termination varies as a function of both HCl and MBI concentration, with the interface consisting of MBI bound to film-free carbon-steel on highly inhibited substrates.
    Original languageEnglish
    Pages (from-to)47-55
    Number of pages9
    JournalCorrosion Science
    Volume- 101
    Publication statusPublished - 2015


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