Optimization and Inhibitive effects of Sweet Potato Leaf Extract (SPLE) on mild steel
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Date
2023-02-02
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Elsevier
Abstract
Weight loss and electrochemical techniques were used to evaluate the inhibition efficiency of
sweet potato leaf extracts (SPLE) as inhibitor on mild steel in phosphoric acid. Box Behnken
design was used to examine the interactions of these variables: acid concentration (0.5–1.5 M);
time (5–10 days); inhibitor concentrations (0.3–0.9 g/L) and temperature (30–60
◦ C) respectively. Polarization and Electrochemical impedance and were used to measure the inhibition
efficiency. The surface morphology of coupons was analysed using Scanning Electron Microscope
(SEM). The experimental data was statistically analysed and regression equation was generated
for inhibition efficiency. The weight loss measurement revealed that extract acts as an inhibitor
for mild steel in phosphoric acid and decreases rate of corrosion. The results of inhibition effi
ciency derived from polarization studies and impedance analyses agree. The validated experi
ment’s coupon created a better protected inhibitive layer than coupon of the best process level as
observed from experimental design, according to SEM analysis. It can be concluded that the
extract operated as an inhibitor by producing outer film on the surface of mild steel.