Mild Steel Corrosion Mitigation in Sulphuric Acid via Benign Isolated Phytochemicals from <I>Viscum album</I>

Abstract

We present the evaluation of four Eco-friendly corrosion inhibitors for the corrosion mitigation of mild steel in acid media. The corrosion inhibition of mild steel by ethanol extracts from Viscum album (EEVA) and some of its isolated phytochemical components; phytates extract (PEVA), saponins extract (SEVA), and flavonoids extracts (FEVA) have been studied using gravimetric and gasometric techniques. The results of the study reveal that these ecofriendly and benign extracts function as good inhibitors for mild steel corrosion in sulphuric acid. Inhibition efficiency of the extracts increases with inhibitor concentration and temperature rise. The trend of inhibition efficiency in lower inhibitor concentration is EEVA > PEVA > SEVA > FEVA and at higher concentration, the order was SEVA > PEVA > EEVA > FEVA. The presence of the plant extracts decreases the corrosion activation energy in the solution which indicates chemical adsorption mechanism. The adsorption of the components of the extracts is consistent with Temkin isotherm. The interaction between the isolated extracts is synergistic at lower inhibitor concentration and antagonistic at higher concentrations. The K ads values for PEVA and SEVA are higher than those of EEVA and FEVA. This implies that PEVA and SEVA are more efficiently adsorbed on the mild steel surface.

Inhibition of Acid Descaling and Pickling Effects on API 5CT Carbon Steel Using Schiff Base Ligand (C24H21N5O2) in 1 M H2SO4 Solution

“…From Table 5, it can be deduced that the data from the interaction between the Schiff base ligand and the API 5CT carbon steel surface fitted very well to the Langmuir than the Frumkin isotherm considering their correlation coefficient values. The Langmuir correlation values were 0.99 across the various temperatures which implies that the inhibition process was a physically adsorbed one and connotes a monolayer adsorption process (Ugi 2024;Nya et al, 2018;Ammouchi et al, 2020). From the Frumkin adsorption data, the interaction parameter values were all positive implying that there was a strong inhibitor molecular interaction between the Schiff base and the carbon steel.…”

“…From the Nyquist plots, it was observed that the diameter of the semicircles obtained were influences by both the free acid and the various concentrations of the Schiff base inhibitor. The difference in sizes of their diameters could be attributed to the strong adsorption of the Schiff base on the working electrode (API 5CT carbon steel), hence increasing the charge transfer resistance (Uct) at the working electrode and decreasing the solution resistance (Rs) of the electrolyte as concentration of the inhibitor increases (Agwamba et al, 2022;Ugi et al, 2025;Nya et al, 2018). However, the addition of SFBL further increased the diameter of the capacitive loop (Figure 5).…”

“…However, the addition of SFBL further increased the diameter of the capacitive loop (Figure 5). The EIS plots were noticed to show some level of imperfection and a single capacity loop and could be linked to API 5CT carbon steel surface roughness, noise effects and a charge transfer type (process) of mechanism of inhibition (Agwamba et al, 2022;Ugi et al, 2025;Nya et al, 2018). The degree of roughness or nonhomogeneity (n1) of API 5CT carbon steel was found to decreased on addition of SFBL, suggesting that the surface roughness of the steel was decreased on adsorption of inhibitor molecules on steel surface active sites and this result is in agreement with those of the morphology (SEM) test (Ugi and Magu 2012;Tan et al, 2020).…”

Study of Glycyrrhiza glabra root extract as green corrosion inhibitor for Copper in Nitric acid.

“…Corrosion of metals is an important problem in industries causing great loss in total production, operation deficiencies, and high cost of maintenance. From previous reports, it is obvious that one of the best methods of protecting metals against corrosion entails the application of inhibitors which are additives that mitigate the rate of corrosion (2)(3)(4)(5)(6)(7). Discovery of various methods have been done since years to mitigate the rate of corrosion and overcome the losses due to corrosion.…”

Electrochemical evaluation of the anti-corrosion potential of selected amino acids on magnesium in aqueous sodium chloride solutions

“…Among the applicable strategies for corrosion protection, the introduction of corrosion inhibitors remains the most feasible. Corrosion inhibitors are sourced from a wide range of materials, which can be organic or inorganic (Nya et al , 2018; Ikeuba et al , 2013; Obike et al , 2020; Ikeuba, 2022). Most efficient commercially available corrosion inhibitors are chromate-based, which raises huge toxicity concerns.…”