Inhibitory Effect of African Pumpkin (<i>Momordica balsamina</i> Linn.) Leaf Extract on Copper Corrosion in Acidic Media

Abstract

Inhibition of copper corrosion in acidic medium by ethanolic extract of Momordica balsamina leaves was investigated. Findings reveal that the rate of copper corrosion increases with increasing temperature of the medium but decreases as the concentration of the Momordica balsamina extract added to the medium increases. Examination of the surface morphology of copper using Scanning Electron Microscopy (SEM) also reveals that while the surface of copper was seriously damaged in acidic solution in the absence of Momordica balsamina extract, addition of 0.8 of the extract significantly protected the copper surface from corrosion. Results obtained from adsorption and thermodynamic studies reveal that the adsorption of the inhibitor on the surface of the copper metal fitted well to both Freundlich ( ≥ 0.948) and Temkin ( ≥ 0.940) adsorption models and the low values of activation energies obtained ( ≤ 34.02 ) indicate that the adsorption of the inhibitor on the copper surface favors the mechanism of physical adsorption. Negative signs of obtained in the study suggest that the adsorption of Momordica balsamina on the copper metal is thermodynamically favorable. The data obtained in this study demonstrate that extract of Momordica balsamina leaves probably contains one or more chemical species that protect copper against corrosion through the mechanism of physical adsorption. © JASEM https://dx.doi.org/10.4314/jasem.v21i6.12

Analysis of inhibition action of acacia nilotica ethanol extract on aluminium corrosion in 1.0M HCl and NaOH

“…Weight loss and corrosion rate increases with temperature thereby decreasing surface coverage and inhibition efficiency. Result similar to this was reported in literature (Maibalangu et al, 2017).…”

Momordica balsamina L.: A Plant with Multiple Therapeutic and Nutritional Potential—A Review

“…Numerous phenolic acids, such as quinic acid and various chlorogenic acids, have been identified within the plant [16,17]. Unique compounds, including pseudolaroside A acid and isocitric feruloyl acid, have been reported for the first time in relation to M. balsamina [19]. Common flavonoids, including kaempferol, quercetin, and isorhamnetin, have been identified, each exhibiting distinct glycoside forms [16,17].…”

“…Extracts from the leaves of M. balsamina serve as effective metal cleaners [62]. Additionally, the ethanolic extract of M. balsamina leaves has been studied for its potential to safeguard copper from corrosion within acidic environments [19]. In the Hausa regions of Nigeria and the Niger Republic, the leaves are incorporated into green vegetable soups consumed by nursing mothers.…”

Synthesis, Characterization and corrosion Inhibition Studies on Mn (II) and Co (II) Complexes Derived from 1-{(Z)-[(2-hydroxyphenyl) imino]methyl}naphthalen-2-ol in 1M HCl Solution

“…Acidic solution containing 1.0 moldm -3 HCl was prepared by dissolving 8.60 cm 3 of concentrated HCl in distilled water and diluting the resulting solution to volume in 100 cm 3 volumetric flasks (Maibulangu et al, 2017). The concentration of the inhibitors (Schiff base, Mn (II) complex and Co (II) complex) used for the study were 0.02, 0.04, 0.06, 0.08 and 0.10 gL -1 .…”