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Inhibitor effect of sodium benzoate on the corrosion behavior of nanocrystalline pure iron metal in near-neutral aqueous solutions

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Abstract

Nanocrystalline iron coating was produced on carbon steel surface by pulse electrodeposition using citric acid bath. The grain size of a nanocrystalline surface was analyzed by X-ray diffractometry and scanning electron microscopy. The electrochemical behavior of nanocrystalline iron coating in the presence of sodium benzoate was evaluated in 30 mg l-1 NaCl + 70 mg l-1 Na2SO4 aqueous solution using potentiodynamic polarization curves and electrochemical impedance spectroscopy. The results were compared with that of the coarse-grained iron surface. The thermodynamic properties of the inhibitor adsorption were also determined. The results indicated that corrosion inhibition of sodium benzoate in near-neutral aqueous solution was increased as the grain size of iron was decreased from micro- to nanocrystalline surface. This was reported in terms of excess free energy of nanocrystalline surface.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Engineering, Faculty of Engineering, University of Tehran, P.O. Box 11155-4563, Tehran, Iran

    Vahid Afshari & Changiz Dehghanian

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  1. Vahid Afshari
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  2. Changiz Dehghanian
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Correspondence to Vahid Afshari.

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Afshari, V., Dehghanian, C. Inhibitor effect of sodium benzoate on the corrosion behavior of nanocrystalline pure iron metal in near-neutral aqueous solutions. J Solid State Electrochem 14, 1855–1861 (2010). https://doi.org/10.1007/s10008-010-1066-0

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  • DOI: https://doi.org/10.1007/s10008-010-1066-0

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