Development of novel leaf extract of Dioscorea dumetorum: A corrosion-resistant material for steel in HCl medium
DOI:
https://doi.org/10.62638/ZasMat1404Abstract
The use of green corrosion inhibitors is one of the most efficient control methods for protecting metals from electrochemical reactions. In this study, Discorea dumetorum was explored as a potential corrosion inhibitor for mild steel in 1 M HCl medium using the weight loss technique, phytochemical screening, and optical microscopy. This novel inhibitor of plant origin is analyzed for anticorrosive characteristics in an acidic medium. The quantitative result of the phytochemical elements in Dioscorea dumetorum showed that it contains steroids, phenols, saponins, and tannins. The results obtained from weight loss measurement showed that the maximum inhibition efficiencies were 71.3%, 80%, and 76.9% from 1 g, 2 g, and 3 g concentrations, respectively, and that of the optical microscopy indicated pitting and intergranular corrosion on the sample surface, while the degree of surface coverage established the formation of protective film on the sample surface, which implies that the inhibitor is adsorbed at the interface between the mild steel and the acid medium. The theoretical fittings of the two adsorption models for the extract were found to obey the Langmuir’s isotherm, with its adsorption-desorption equilibrium constant (Kads) values between 0.6030 and 0.7858 g/l and R2 of 0.3252 to 0.4555, while values of Gibb’s energy of adsorption ( are from -11.424 down to -7.3730 kJ mol-1 indicate electrostatic interaction between charged molecules and charged metal, indicating physisorption. The extract has proven its potential as an eco-friendly alternative to synthetic corrosion inhibitors.
Keywords:
Corrosion; mild steel; Dioscorea dumentorum; corrosion inhibition; physisorptionReferences
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