Inhibitive Behaviour of Acacia senegalensis on Corrosion Resistance of Mild Steel-Acidic Environment

Evaluation of Grewa Venusta (Wild Jute Tree) Extract as Corrosion Inhibitor for Mild Steel in Acidic Environment

“…5. The polarization study showed that there was the formation of a protective film formed on the metal surface during corrosion inhibition process, as observed by [12,17]. It could also be observed that both the cathodic and anodic reactions were suppressed with the addition of Grewa Venusta; this resulted in a protective film formed on the metal surface, thereby decreasing the corrosion current value (Icorr).…”

“…The optimum concentration for Grewa Venusta was found to be 8% v/v with maximum inhibition efficiency of 97.90% for the period of 3 hours of immersion time. This result indicated that the plant extract could act as effective corrosion inhibitor for mild steel in 1.0 M HCl, due to the compounds/elements determined by both analytical /quantitative method, AAS and GC-MS, shown in Tables 1, 2 and 2 [7,8,11,12]. The effect of immersion time was studied for periods of 1h to 6h, as shown in Table 7; it reveals that the plant extract showed maximum efficiency at 3h of immersion time (as also illustrated in Fig.…”

“…C, respectively. From the measured weight loss data, the corrosion rate (mm/y) and the inhibition efficiency (IE) were calculated using equations 1 and 2 as in [12]: (1) where K = 8.76 x 10 4 (constant), W = weight loss in g, A = area in cm 2 , t = time in hours, and D = density in g/cm 3 (7.86), respectively.…”

“…In order to specify the adsorption mode of Grewa Venusta molecules on the mild steel surface in the acidic solution, the degree of surface coverage ( ), at different concentrations of the inhibitor (% v/v) in the stagnant aerated acidic solution, was determined from the corresponding weight loss measurements, according to eq. 2 [12,19]:…”

“…Therefore, protective films are formed on the metal surface and, hence, corrosion is prevented, according to [11]. The inhibition efficiency of plant extracts, in controlling corrosion of metals in various environments, has been investigated in acidic media [12][13][14][15][16]. In the present work, Grewa Venusta extract was found out to be a cheap, ecofriendly and naturally occurring substance, and its inhibitive action on the corrosion behaviour of mild steel in 1.0 M HCl was investigated through Gravimetric -weight loss and Potentiodynamic polarization (Tafel analysis) measurements at 30, 45, 60 and 75 o C in an acidic environment.…”