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Surface morphological and impedance spectroscopic studies on the interaction of polyethylene glycol (PEG) and polyvinyl pyrrolidone (PVP) with mild steel in acid solutions

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Abstract

The inhibition of mild steel corrosion in aerated acid mixture of 0.5 N H2SO4 and 0.5 N HCl solution was investigated using potentiodynamic polarization studies, linear polarization studies, electrochemical impedance spectroscopy, adsorption, and surface morphological studies. The effect of inhibitor concentration on corrosion rate, degree of surface coverage, adsorption kinetics, and surface morphology is investigated. The inhibition efficiency increased markedly with increase in additive concentration. The presence of PEG and PVP decreases the double-layer capacitance and increases the charge-transfer resistance. The inhibitor molecules first adsorb on the metal surface following a Langmuir adsorption isotherm. Both PEG and PVP offer good inhibition properties for mild steel and act as mixed-type inhibitors. Surface analysis by scanning electron microscopy (SEM) and atomic force microscopy (AFM) shows that PVP offers better protection than PEG.

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Acknowledgments

One of the authors (S.J.) is grateful to CSIR New Delhi for providing a senior research fellowship.

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Authors and Affiliations

  1. Department of Chemistry, University of Calicut, Calicut, 673 635, Kerala, India

    Sam John, Mathew Kuruvilla & Abraham Joseph

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  1. Sam John
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  2. Mathew Kuruvilla
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  3. Abraham Joseph
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Correspondence to Abraham Joseph.

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John, S., Kuruvilla, M. & Joseph, A. Surface morphological and impedance spectroscopic studies on the interaction of polyethylene glycol (PEG) and polyvinyl pyrrolidone (PVP) with mild steel in acid solutions. Res Chem Intermed 39, 1169–1182 (2013). https://doi.org/10.1007/s11164-012-0675-x

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  • DOI: https://doi.org/10.1007/s11164-012-0675-x

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