Equilibrium and Thermodynamic Characteristics of the Corrosion Inhibition of Mild Steel Using Sweet Prayer Leaf Extract in Alkaline Medium

Adebayo, Matthew Ayorinde; Akande, Samson Olayinka; Olorunfemi, Adebowale Daniel; Ajayi, Oluwatosin Omoyemi; Orege, Joshua Iseoluwa; Daniel, Enobong Felix

doi:10.22034/pcbr.2021.120449

Document Type : Original Research Article

Authors

¹ Department of Chemistry, The Federal University of Technology, Akure, Nigeria

² Department of Industrial Chemistry, Ekiti State University, PMB 5363, Ado-Ekiti, Nigeria

³ Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Dalian 116023, China

⁴ Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

⁵ School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

⁶ University of Science and Technology of China, Baohe District, Hefei, Anhui 230026, China

https://doi.org/10.22034/pcbr.2021.120449

Abstract

The usage of synthetic-based inhibitors for protection of metals against corrosion is always accompanied by environmental and economic challenges, including a threat to human health. Therefore, the corrosion inhibition efficiency of sweet prayer (Thaumatococcus danielli) leaf extract on mild steel in alkaline medium (NaOH) was investigated. The effects of temperature and concentration of the inhibitor on corrosion inhibitive potential of the leaf extract were evaluated. The equilibrium data were subjected to isotherm analysis (Langmuir, Freundlich and Temkin models). Langmuir model was the best model that provided information on the adsorption of the corrosion systems. The values of Langmuir equilibrium constant (K_L) increased from 0.1581 g/L to 0.6523 g/L as the temperature increased from 298 K to 333 K. The findings revealed that sweet prayer leaf extract at different concentrations had inhibitive effects of mild steel on alkaline medium. The values of activation energy of the inhibited corrosion systems were greater than that of obtained for uninhibited system. Thermodynamic study revealed a feasible and spontaneous adsorption of sweet prayer leaf extract on mild steel. The trends of inhibition efficiencies and the results obtained from the thermodynamic parameters suggested a physical adsorption mechanism. The study proved that the sweet prayer leaf extract could serve as a low-cost corrosion inhibitor of mild steel in alkaline medium.

Graphical Abstract

Keywords

20.1001.1.26767090.2021.4.1.8.9

Main Subjects

Biochemical and Medical science

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Progress in Chemical and Biochemical Research

Equilibrium and Thermodynamic Characteristics of the Corrosion Inhibition of Mild Steel Using Sweet Prayer Leaf Extract in Alkaline Medium

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References

Volume 4, Issue 1
January 2021
Pages 80-91

Equilibrium and Thermodynamic Characteristics of the Corrosion Inhibition of Mild Steel Using Sweet Prayer Leaf Extract in Alkaline Medium

Full Text

Full Text

References

References

Volume 4, Issue 1January 2021Pages 80-91

Volume 4, Issue 1
January 2021
Pages 80-91