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AC impedance measurement of cystine adsorption at mild steel/sulfuric acid interface as corrosion inhibitor

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Abstract

Alternating current (AC) impedance measurements of mild steel/sulfuric acid interface in the absence and in the presence of various concentrations of cystine (Cys–Cys) have been carried out in the 100 kHz–10 mHz frequency range. The results revealed that Cys–Cys is a good and effective inhibitor for mild steel corrosion in 0.5 M H2SO4 and its percent inhibition efficiency changes with its concentration. Changes in impedance parameters indicated the adsorption of Cys–Cys on the mild steel surface, which was verified by scanning electron microscope (SEM) and atomic force microscope (AFM) photographs. Adsorption of Cys–Cys on mild steel surface was found to obey the Langmuir adsorption isotherm with a standard free energy of adsorption \(\left( {\Delta G_{{\text{ads}}}^ \circ } \right)\) of −33.2 kJ/mol. Energy gaps for the interactions between mild steel surface and Cys–Cys molecule were found to be close to each other showing that Cys–Cys owns capacity to behave as both electron donor and electron acceptor.

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Acknowledgment

The experimental studies of this work were carried out at Physical Chemistry Research Laboratory of Chemistry Department, Çukurova University.

The author would like to thank Professor Dr İlyas Dehri (Department of Chemistry, Cukurova University) and Assistant Professor Dr Faruk Karadağ (Department of Physics, Cukurova University) for their discussions and comments.

The author is also grateful to Associate Professor Dr Mustafa Çulha (Department of Genetics and Bioengineering, Yeditepe University) for SEM and AFM photographs.

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Authors and Affiliations

  1. Department of Science and Technology Education, Cukurova University, 01330, Adana, Turkey

    Muzaffer Özcan

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  1. Muzaffer Özcan
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Correspondence to Muzaffer Özcan.

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Özcan, M. AC impedance measurement of cystine adsorption at mild steel/sulfuric acid interface as corrosion inhibitor. J Solid State Electrochem 12, 1653–1661 (2008). https://doi.org/10.1007/s10008-008-0551-1

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  • DOI: https://doi.org/10.1007/s10008-008-0551-1

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