Squid By-product Gelatin Polymer as an Eco-friendly Corrosion Inhibitor for Carbon Steel in 0.5 M H2SO4 Solution: Experimental, Theoretical, and Monte Carlo Simulation Studies

  • Ahmed A. FaragEmail author
  • Amr S. Ismail
  • M. A. Migahed


A squid by-product (SBP) gelatinous protein polymer has been extracted, characterized, and examined as eco-friendly inhibitor for carbon steel in 0.5 M H2SO4 media by weight loss and electrochemical techniques. It was found that the SBP acts as a good corrosion inhibitor. The inhibition efficiency increases with increasing inhibitor concentration, but the temperature has hardly affected on the inhibition efficiency of SBP. Thermodynamic data clearly show that the adsorption mechanism of SBP on the carbon steel surface in 0.5 M H2SO4 solution is mainly physical adsorption. Moreover, the adsorption of the SBP molecules was found to follow a Langmuir adsorption isotherm. Results of potentiodynamic polarization measurements revealed that the SBP acts as mixed-type inhibitor. Data obtained from electrochemical impedance spectroscopy studies were analyzed to model inhibition process through appropriate equivalent circuit model. Theoretical parameters derived from quantum chemical calculations as well as binding energy derived from molecular dynamics simulation studies adequately corroborate the trend of experimental inhibition efficiencies of the studied inhibitors.


Carbon steel Eco-friendly inhibitor Adsorption Weight loss EIS Quantum chemical calculations Molecular dynamics simulations 



The authors are greatly thankful to the Egyptian Petroleum Research Institute (EPRI) for fund and support.


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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Petroleum Applications DepartmentEgyptian Petroleum Research InstituteCairoEgypt
  2. 2.Petrochemicals DepartmentEgyptian Petroleum Research InstituteCairoEgypt

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