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 aE 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
Highlights
Corrosion is the destruction of a material by a reaction which involves chemical, biochemical or electrochemical processes with the immediate environment
Figure (1b) shows that the extract was most efficient as the concentration of inhibitor increases from 0.01g/ml to 0.15g/ml. these results agrees with similar work done by Oguzie et al,(2013)
This study provides investigation on the effects of the almond seed extracts on the inhibition of corrosion caused by acidity in a medium
Summary
Corrosion is the destruction of a material by a reaction which involves chemical, biochemical or electrochemical processes with the immediate environment. Most synthetic inhibitors are organic compounds containing nitrogen, sulphur or oxygen atoms in their structures (Chigondo and Chigondo, 2016).The cost of these inhibitors is high and the inhibitor could be toxic to human and the Environment This pestilent effects has created the desire for an environmentally friendly inhibitors as a replacement for the toxic synthetic inhibitors to promote greenness to the environment. The used of plant extracts as inhibitors are vindicated by the phytochemical contents which have both electronic and molecular structures similar to the convention synthetic inhibitors(Oguzie et al.,2013) This investigation of the use of Prunusdulcis extract as a green corrosion inhibitor on mild steel in Frederick Okhakumhe Oshomogho,Chemical Engineering Department, University of Benin, PMB 1154, Benin City, Nigeria. Joy Ehimwenma Ossai, Chemical Engineering Department, University of Benin, PMB 1154, Benin City, Nigeria
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