The inhibition of corrosion of mild steel in 1 molar hydrochloric acid solution (1 M HCl) by Mucuna pruriens seed extract (MPSE) was investigated by weight-loss and electrochemical techniques. A significant decrease in the corrosion rate of mild steel was observed in the presence of the investigated additive and the inhibition efficiency was found to depend on the concentration of the MPSE. The potentiodynamic polarization data indicated that this additive was of mixed type, but the anodic effect was more pronounced. Nyquist plots showed that on increasing the MPSE concentration, the charge transfer resistance increased and double layer capacitance decreased. The thermodynamic parameters of adsorption revealed a strong interaction between the MPSE constituents and the corroding metal surface. MPSE lowered the corrosion reaction by blocking the mild steel surface through chemical adsorption. The mechanism of inhibition was discussed in the light of the chemical structure of the four major components of MPSE.
Background The inhibitive effect of the aqueous extract of Rothmannia longiflora (RL) on the corrosion of mild steel in 1 M HCl and 0.5 M H 2 SO 4 solutions was investigated by weight loss measurement as well as potentiodynamic polarization and electrochemical impedance spectroscopy measurements. Result The extract was found to efficiently inhibit the corrosion process in both environments and inhibition efficiency increased with increasing extract concentration as well as rise in temperature. Data from electrochemical measurements suggest that the extract functioned by adsorption of the organic matter on the metal/corrodent interface, inhibiting both the anodic and cathodic half reactions of the corrosion process. Conclusion The result obtained from this study clearly shows that RL functioned as a good inhibitor for the corrosion of mild steel in 1 M HCl and 0.5 M H 2 SO 4 solutions and the inhibiting efficiency value increased with the inhibitor concentration. The adsorption of the RL on the mild steel surface in acid solution obeyed Langmuir adsorption isotherm.
Acidic metabolites were precipitated from ethanolic extract of Garcinia kola seed and fractionated by column chromatography to obtain three fractions AM1, AM2, and AM3. Chemical test on the acidic metabolites and the fractions showed they were mainly flavonoids. In vitro antibacterial screening of the fractions showed they possessed antibacterial activity. They inhibited the growth of five human test bacterial isolates: Coliform bacilli, Escherichia coli, Salmonella spp., Staphylococcus aureus and Streptococcus spp. Their inhibition zone diameters ranged from 8 mm to 26 mm. The standard control antibiotic Ciprofloxacin gave inhibition zone diameters ranging from 18 mm to 20 mm, at the same concentration of 100 mg/ml for the same test bacteria. It was concluded that with appropriate standardization, the three fractions from the acidic metabolites of ethanolic extract of seed of Garcinia kola could effectively complement the existing antibiotics with beneficial health effect.
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