Investigating Moringa Oleifera and Psidium Guajava Leaves Extract as Low-Cost, Eco-Friendly Inhibitors of Corrosion on Mild Steel in an Acidic Environment
This work investigated the inhibitory properties of low-cost, eco-friendly corrosion inhibitors (Moringa Oleifera and Psidium guajava Leaves Extract). In particular, the effect of different volumes in the range 25-50 cm3 of Moringa Oleifera and Psidium guajava Leaves Extract on the Corrosion Susceptibility of Mild Steel at different concentrations of an acidic environment (hydrogen tetra-oxosulphate VI, H2SO4), was used in the study. The experiment included casting the mild steel into rods; which were machined and subsequently cut into coupons averaging a total surface area of 6.284 cm2. The coupons were weighed and immersed into different beakers containing 0.5M and 1.0M of hydrogen tetra-oxosulphate VI acid, and the different volumes of the Moringa oleifera (MO) and Psidium guajava (PG) were introduced in the respective beakers and then labelled for easy and proper identification. The total exposure time was between 7 to 28 days, with the coupons removed every 7 days for weight loss measurements using the normal procedures. The results indicate that the corrosion penetration rate was very high in the control (without inhibitor), and was decreased when the inhibitor was introduced. However, the decrease was more pronounced (>80%) at a volume of 100 cm3 of Moringa oleifera leaf extracts at 0.5M and 1.0M of the acidic media respectively. According to the findings, it was concluded that the volume of 100 cm3 of Moringa oleifera leaf extracts at a concentration of 0.5M and 1.0M of the acidic media is the optimum conditions for reduced corrosion rate of mild steel in an acidic environment.
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