Anti-Corrosion Enhancement of Mild Steel Using Acid Extraction of Water Hyacinth Leaves from Igbokoda Nigeria Water Ways as Inhibitor

D. T. Oloruntoba, A. P. I. Popoola, O. O. Lawal, Aigbodion V. S.

Abstract


There is a growing trend in the use of plant extracts as corrosion inhibitors because of the toxic nature and high cost of synthetic organic compounds. The inhibitive performance of extract of water hyacinth plant (Eichhornia crassipes) on the corrosion behavior of mild steel in 0.5M H2SO4 solution was studied. Phytochemical analysis of the water hyacinth plant was carried out. The corrosion test was conducted by varying the inhibitor from 2.0 to 10.0 v/v% in 0.5 M 0.5 M H2SO4. Polarization resistant, current density (Icorr), and corrosion potentials (Ecorr) were obtained from Methro Ohms Potentiostat. Corroded surfaces of the coupons were then analyzed using Scanning Electron Microscope to study the corrosion mechanisms and to correlate them with the corrosion test results. The results indicated that the extract of water
hyacinth plant act as an effective corrosion inhibitor in the acid environment. The inhibition efficiency increase with increase in concentration of the inhibitor and decreased with increased in temperature. The inhibition capacity of this extract is attributed to the presence of saponnin and tannin in the extract. Potentiodynamic Polarization results show that 6 % v/v of the leaves acid extracts had the lowest corrosion potential and polarization resistance. The inhibition efficiency of acid extract of the leaves on mild steel from weight loss calculation has inhibition efficiency of 81 % at 6 v/v. Based on the results obtained in this study, it is recommended that the water hyacinth plant (Eichhornia crassipes) in tanks containing sulphuric acid used for washing, cleaning and pickling.
Keywords: corrosion inhibition, water hyacinth extract, acidic medium, mild steel,
microstructure.


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