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Electrochemical behavior of phenylalanine and its cobalt complex as corrosion inhibitors for mild steel in H2SO4

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Abstract

Corrosion inhibition of phenylalanine (phe) and its its cobalt complex(Co-phe) were evaluated using electrochemical polarization and electrochemical impedance spectroscopy (EIS) for mild steel in 0.1 M H2SO4 solution. The results indicate that the compounds inhibit the corrosion of mild steel in H2SO4 solutions and the extent of inhibition increases with inhibitor concentration and decreases with temperature. The order of inhibition efficiency obtained was Co-phe > phe. The adsorption characteristics of the inhibitor were approximated by Langmuir isotherm. Morphological study of the carbon steel electrode surface was undertaken by scanning electron microscope (SEM).

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Authors and Affiliations

  1. Department of Applied Chemistry, Shenyang University of Chemical Technology, 110142, Shenyang, China

    X. Liu, Y. Lu & Y. S. Yang

  2. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, 110016, Shenyang, China

    H. X. Hu & Y. G. Zheng

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  1. X. Liu
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  2. Y. Lu
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  3. Y. S. Yang
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  4. H. X. Hu
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  5. Y. G. Zheng
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Correspondence to X. Liu.

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Liu, X., Lu, Y., Yang, Y.S. et al. Electrochemical behavior of phenylalanine and its cobalt complex as corrosion inhibitors for mild steel in H2SO4 . Russ J Appl Chem 88, 350–355 (2015). https://doi.org/10.1134/S1070427215020263

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