Azadirachta Indica's adsorptive behavior on mild steel in a sulfuric acid medium

Authors

  • U. S. Nwigwe Department of Mechanical Engineering, Faculty of Engineering and Technology, Alex Ekwueme Federal University Ndufu-Alike, Ikwo, Ebonyi State, 840001, Nigeria
  • C. I. Nwoye Department of Metallurgical and Materials Engineering, Faculty of Engineering, Nnamdi Azikiwe University, Awka, Anambra State, 420007, Nigeria
  • A. S. Bello Chemistry Laboratory, Department of Chemistry, Faculty of Science, Alex Ekwueme Federal University Ndufu-Alike, Ikwo, Ebonyi State, 840001, Nigeria
  • N. E. Nwankwo Department of Metallurgical and Materials Engineering, Faculty of Engineering, Nnamdi Azikiwe University, Awka, Anambra State, 420007, Nigeria

Keywords:

Adsorption, concentration, inhibition efficiency, organic extract, weight loss.

Abstract

This research investigated the corrosion of mild steel by exploring the anti-corrosion potentials of Azadirachta Indica leaf extract in 1.5 M of H2SO4 acid medium. Assessment was made using weight loss, fourier transform infrared spectroscopy, optical microscopy, and potentiodynamic polarization method. Measurements revealed that on the first four days, samples with 4g/l, 5g/l, and 6g/l extract showed the best inhibitory efficiency of 72.03%, 71.89%, and 71.33%, respectively. While in general, inhibition efficiency was found to decrease as exposure time increases. The computed  values for the extract ranged from -6.993 to -9.675 kJ mol-1, while the adsorption isotherm data fitted well into the Temkin isotherm, confirming a physisorption interaction between the extract molecules and the surface of the mild steel coupons. Going by the results obtained, the extract can be applied against corrosion attack on mild steel and other metals in acidic media.

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Published

2023-09-30

Issue

Vol. 2 No. 2 (2023): UNIZIK Journal of Engineering and Applied Sciences

Section

Articles