European Journal of Chemistry 2016, 7(1), 14-18. doi:10.5155/eurjchem.7.1.14-18.1331

Corrosion inhibition of carbon steel in chloride solutions by some amino acids


Nady Hashem El-Sayed (1,*)

(1) Chemistry Department, Faculty of Science, Fayoum University, Fayoum City, 63514, Egypt
(*) Corresponding Author

Received: 10 Oct 2015, Accepted: 14 Nov 2015, Published: 30 Mar 2016

Abstract


The corrosion inhibition of carbon steel was investigated in stagnant naturally aerated chloride solutions using amino acids as environmentally safe corrosion inhibitors. The corrosion rate was calculated in the absence and presence of the corrosion inhibitor using the polarization technique and electrochemical impedance spectroscopy. The experimental impedance data were fitted to theoretical data according to a proposed electronic circuit model to explain the behavior of the alloy/electrolyte interface under different conditions. The corrosion inhibition process was found to depend on the adsorption of the amino acid molecules on the metal surface. Cysteine, histidine, phenylalanine and arginine have shown remarkably high corrosion inhibition efficiency. The corrosion inhibition efficiency was found to depend on the structure of the amino acids. The mechanism of the corrosion inhibition process is based on the adsorption of the amino acid molecules on the active sites of the metal surface. Results obtained from potentiodynamic polarization indicated that the inhibitors are mixed-type inhibitor.


Keywords


Impedance; Amino acids; Polarization; Carbon steel; Corrosion inhibition; Potentiodynamic polarization

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DOI: 10.5155/eurjchem.7.1.14-18.1331

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How to cite


El-Sayed, N. Eur. J. Chem. 2016, 7(1), 14-18. doi:10.5155/eurjchem.7.1.14-18.1331
El-Sayed, N. Corrosion inhibition of carbon steel in chloride solutions by some amino acids. Eur. J. Chem. 2016, 7(1), 14-18. doi:10.5155/eurjchem.7.1.14-18.1331
El-Sayed, N. (2016). Corrosion inhibition of carbon steel in chloride solutions by some amino acids. European Journal of Chemistry, 7(1), 14-18. doi:10.5155/eurjchem.7.1.14-18.1331
El-Sayed, Nady. "Corrosion inhibition of carbon steel in chloride solutions by some amino acids." European Journal of Chemistry [Online], 7.1 (2016): 14-18. Web. 19 Sep. 2019
El-Sayed, Nady. "Corrosion inhibition of carbon steel in chloride solutions by some amino acids" European Journal of Chemistry [Online], Volume 7 Number 1 (30 March 2016)

DOI Link: https://doi.org/10.5155/eurjchem.7.1.14-18.1331

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