GREEN CORROSION INHIBITION OF MILD STEEL USING PRUNUS DULCIS SEEDS EXTRACT IN AN ACIDIC MEDIUM

OSHOMOGHO FREDERICK OKHAKUMHE, AKHIHIERO THELMA EJIRO, EDOKPAYI OSARIEMEN, OSSAI JOY EHIMWENMA

Abstract


Synthetic inhibitors use by industries often have adverse effect on the environment. This work therefore investigates
the use of plant extract as an inhibition to mild steel corrosion in an acidic environment. Weight loss method was
adopted to evaluate inhibition efficiency by plant extract as corrosion inhibitors. Almond seeds (Prunusdulcis) was
extracted with the aid of Soxhlet apparatus. The corrosion inhibition experiment was performed by setting up reactors
containing mild steel coupon with variable concentrations of plant extract and 200ml of 1.5M HCl solution. The study
revealed that the extract was an efficient inhibitor and was most effective as the concentration increased from 0.81%
at 0.01g/ml to 69.95% at 0.15g/ml respectively. Adsorption study on mild steel surface showed that the experimental
data fitted better into the Temkin isotherm with regression R2 closer to unity. Arrhenius constant and activation energy
estimated at temperatures 308K to 328K revealed that activation energy a E increased with increasing inhibitor
concentration from 5348.23J/mol at 0.01g/ml to 6151.44J/mol at 0.05g/ml. The outcome of the study revealed that
mild steel is susceptible to corrosionwhich is capable of destroying the material and increasing inhibitor concentration
and temperature has significant influence on the corrosion.


Keywords


Mild steel, Corrosion, Inhibitor, Plant Extract, Adsorption.

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