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A comparative electrochemical study of electrosorbed 2- and 4-mercaptopyridines and their application as corrosion inhibitors at C60 steel

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Abstract

The electrochemistry of self-assembled monolayers (SAMs) prepared from 2-mercaptopyridine (2 Mpy) and 4-mercaptopyridine (4 Mpy) dissolved in either water or an aqueous solution of 0·1 M H2SO4 on a polycrystalline gold electrode has been investigated in an aqueous electrolyte solution (0·5 M H2SO4) using cyclic voltammetry. Results suggest that 2 Mpy is adsorbed more strongly than 4 Mpy due to the formation of a S-Au-N chelate. The under- and over-potential deposition of copper from an aqueous solution of 0·1 M sulphuric acid is inhibited in the presence of these SAMs suggesting strong interactions between these adsorbates and the gold surface. A copper adlayer was partially displaced by adsorbing 2 Mpy and 4 Mpy. The inhibition effect of these SAMs on the corrosion of C60 steel has been investigated using electrochemical impedance measurements (EIM) in an aqueous 3·5 wt% NaCl solution. The polarization resistance and the inhibition efficiency were calculated. 2 Mpy has higher inhibition efficiency than 4 Mpy.

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Authors and Affiliations

  1. Institut für Chemie, AG Elektrochemie, Technische Universität Chemnitz, D-09107, Chemnitz, Germany

    Nazly Hassan & Rudolf Holze

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  1. Nazly Hassan
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  2. Rudolf Holze
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Correspondence to Rudolf Holze.

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Dedicated to the memory of the late Professor S K Rangarajan

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Hassan, N., Holze, R. A comparative electrochemical study of electrosorbed 2- and 4-mercaptopyridines and their application as corrosion inhibitors at C60 steel. J Chem Sci 121, 693–701 (2009). https://doi.org/10.1007/s12039-009-0083-y

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