Chemical Research in Chinese Universities ›› 2021, Vol. 37 ›› Issue (3): 718-728.doi: 10.1007/s40242-021-0334-0

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Lignin-Phenylhydrazone as a Corrosion Inhibitor of API X52 Carbon Steel in 3.5% NaCl and 0.1 mol/L HCl Medium

Nabila AISSIOU1,2, Moussa BOUNOUGHAZ1,2, Amel DJEDDI2   

  1. 1. Laboratoire de Traitement et Mise en Forme des Polymères, Université M'Hamed Bougara, Boumerdes, 35000, Algeria;
    2. Université M'hamed Bougara, Faculté des Sciences, Boumerdes, 35000, Algeria
  • Received:2020-10-21 Revised:2021-01-15 Online:2021-06-01 Published:2021-05-31
  • Contact: Nabila AISSIOU E-mail:nabila.aissiou@univ-boumerdes.dz
  • Supported by:
    We hereby acknowledge the efforts of Prof. Aliouche, the director of our research laboratory, Dr. Hadjadj whose support allowed this research to be completed. We extend our sincere thanks to our colleagues and all those who contributed directly or indirectly to this manuscript.

Abstract: The best alternative to fight against corrosion is the use of an inhibitor, the purpose of this work is the formulation of a new biomass-based molecule against corrosion of carbon steel. Lignin was extracted using the Kraft process and phenylhydrazine molecules have been scratched. The influence of the lignin-phenylhydrazone(LP) on the corrosion of carbon steel in salt and the acidic medium was studied by the polarization resistance, the potentiodynamic polarization, and the electrochemical impedance spectroscopy. The results of these tests reveal that the behavior of the inhi-bitor is a mixed type. The adsorption mechanism of the inhibitor follows the Langmuir isothermal model. Gibbs energy shows that the process of inhibition of carbon steel is spontaneous. The SEM confirms that the inhibitor reduces the corrosion of the steel and stops the corrosion pitting phenomenon. The modified lignin shown as a good corrosion inhibitor in acid medium is highly saline with an efficiency> 96%.

Key words: Kraft Lignin, Phenylhydrazone, Corrosion inhibitor, Corrosion pitting, Electrochemical Impedance