Electrochemical Properties of a New Green Corrosion Inhibitor Derived from Prosopis farcta for St37 Steel in 1 M Hydrochloric Acid


This study investigated the effect of different concentrations of Prosopis farcta extract on the electrochemical properties and corrosion of St37 steel in 1 M hydrochloric acid medium. The investigation showed that Prosopis farcta extract contains a mixture of oily compounds, alkaloids, and flavonoids, which give it notable corrosion inhibition ability. The results of Tafel polarization, electrochemical impedance, and weight loss tests were consistent in confirming the corrosion inhibition effect of this extract. The maximum percentage inhibition achieved in the Tafel test, EIS test, and weight loss test was 91%, 94%, and 82% respectively. Experiments showed that Prosopis farcta extract classifies as a mixed type corrosion inhibitor. The inhibition effect of this extract is the product of the adsorption of its molecules in the electrolyte–metal interface, and this adsorption follows Langmuir isotherm. The adsorption activation energy of Prosopis farcta extract for St37 steel in 1 M hydrochloric acid was calculated to \(- 10.945{\text{kJ}}/{\text{mol}}\), which shows the spontaneity of this adsorption in this system.

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Correspondence to Hossein Tavakoli.

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Ferdosi Heragh, M., Tavakoli, H. Electrochemical Properties of a New Green Corrosion Inhibitor Derived from Prosopis farcta for St37 Steel in 1 M Hydrochloric Acid. Met. Mater. Int. 26, 1654–1663 (2020). https://doi.org/10.1007/s12540-019-00453-6

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  • Green corrosion inhibitor
  • Prosopis farcta extract
  • EIS
  • Tafel polarization