Abstract
The effect of benzenethiol (BT) and some substituted benzenethiols — {o-methyl benzenethiol (o-MBT), o-amino benzenethiol (o-ABT), p-amino benzenethiol (p-ABT) and m-methyl benzenethiol (m-MBT)} — on the corrosion of copper in H2SO4 and NaOH solutions has been investigated by means of spectrophotometric measurements, potentiostatic polarization studies, cyclic voltammetry and potential stepping experiments. In acid solutions, under ordinary conditions, the thiols are adsorbed onto the metal surface in their molecular forms through their thiol(-SH) moiety and when the potential is made more noble oxidative dimerization of the thiols takes place, and the dimer replaces the thiol. Both thiols and their dimers are not effective as inhibitors. In alkaline solutionsin situ polymerization of thiol takes place to yield polythiol which is a very effective inhibitor both in acidic and alkaline media.
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Sankarapapavinasam, S., Ahmed, M.F. Benzenethiols as inhibitors for the corrosion of copper. J Appl Electrochem 22, 390–395 (1992). https://doi.org/10.1007/BF01092694
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DOI: https://doi.org/10.1007/BF01092694