Corrosion Inhibition of Mild Steel in Acidic Medium by Jathropha Curcas Leaves Extract

Abstract

:Inhibition of corrosion of mild steel in sulphuric acid by acidic extract of Jatropha Curcas leaves has been studied using weight loss and thermometric measurements. It was found that the leaves extract act as a good corrosion inhibitor for mild steel in all concentrations of the extract. The inhibition action depends on the concentration of the Jatropha Curcas leaves extract in the acid solution. Results for weight loss and thermometric measurements indicate that inhibition efficiency increase with increasing inhibitor concentration. The adsorption of Jatropha curcas leaves extract on the surface of the mild steel specimens obeys Langmuir adsorption isotherm. Based on the results, Jatropha curcas leaves extract is recommended for use in industries as a replacement for toxic chemical inhibitors.

The inhibitive action of Plukenetia conophora plant extract on the corrosion of Al–Zn–Cu alloy in different acidic media

“…Therefore, their usage as metal corrosion inhibitors has raised severe criticisms [10]. As a result of these criticisms, some green inhibitors of plant origin (natural products) have been discovered as they exhibit good corrosion inhibiting properties in different corrosive environments [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30].…”

“…The utilisation of these green inhibitors as corrosion inhibitors become vital as they have been known to be readily available, non-toxic, environmentally friendly, renewable material sources and ecologically acceptable. The organic nature of these plant products contains active constituents such as alkaloids, saponins, essential oils, flavonoids, organic and amino-acids; in which their presence have been established in literature to be advantageous in inhibiting corrosion [16,17,[20][21][22][23].…”

“…Recent studies [21][22][23] have shown that Jatropha curcas and Moringa oleifera leaves extracts possessed good corrosion inhibiting properties on mild steel when immersed into acidic media. Odusote and Ajayi [21] stated that in a sulphuric acid solution, the increasing concentration of J. curcas extracts gave a high inhibitive efficiency. It was concluded that the inhibitive capacity was dependent on the concentration of the leaf extract in the corrosion environment, especially acidic solution.…”

Inhibitory action of Vernonia amygdalina extract (VAE) on the corrosion of carbon steel in acidic medium

“…Here, equation (3) was used to calculate degree of surface coverage () for the different concentrations of VAE. In this study, Langmuir model was adopted to determine the adsorption isotherm according to equation (4).…”

“…Such plants include Jatropha curcas [4][5][6], Tithonia diversifolia [7], Carica papaya [8], Isertia coccinea [9], Telfaria occidentalis [10], Rice husk [11], Nicotiana tabacum [12], Water hyacinth [13], Moringa oleifera [14], Curcuma longa [15], Azadirachta indica [16], Phyllanthus amarus [17] and Bitter leaf [18]. It has been reported that the extract from these plants contained tannin and saponins that contribute to the inhibitory action via physical adsorption mechanism [19].…”