Neolamarckia cadamba alkaloids as eco-friendly corrosion inhibitors for mild steel in 1 M HCl media

Corrosion inhibition by leaves and stem extracts of Sida acuta for mild steel in 1 M H2SO4 solutions investigated by chemical and spectroscopic techniques

Alkaloid extracts of leaves (OOL) and bark (OOB) of Ochrosia oppositifolia, as well as isoreserpiline (ISR), the major alkaloid isolated from OOL and OOB, were investigated as potential corrosion inhibitors for mild steel (MS) in 1 M HCl medium. The inhibition properties of these phytoconstituents were studied using electrochemical techniques (potentiodynamic polarization measurements and electrochemical impedance spectroscopy, EIS) and scanning electron microscopy (SEM). The results indicated that these green inhibitors effectively reduced the corrosion rate. Polarization studies showed that these inhibitors decreased the corrosion current densities by a mixed-mode mechanism. The EIS data were analyzed by an equivalent circuit model for the electrode/electrolyte interface. SEM observations confirmed the existence of an adsorbed protective film of green inhibitors, and the adsorption was found to follow the Langmuir adsorption isotherm. FTIR and molecular modeling studies were also employed and revealed t...

Evaluation of Green Corrosion Inhibition by Alkaloid Extracts of Ochrosia oppositifolia and Isoreserpiline against Mild Steel in 1 M HCl Medium

In recent years, plant extracts have become the focus of corrosion inhibitor research due to their low toxicity, easy availability and economical preparation. This review presents most of the recent contributions made to the application of plant extracts as corrosion inhibitors for steel in sulphuric acid, as well as in both hydrochloric acid and sulphuric acid. The constituents, properties, adsorption modes and inhibition mechanisms of these natural products are discussed. Evaluation methods and the factors that influence the corrosion-inhibition efficiency of plant extracts are also summarised.

Plant extracts as “green” corrosion inhibitors for steel in sulphuric acid

Abstract There has been a strong interest worldwide in developing suitable technologies that can derive chemicals and materials from renewable biomass in a number of applications, including corrosion inhibitors. In spite of the efficacy of conventional inhibitors in corrosion control, current corrosion inhibitors exhibit toxicity and/or are non-biodegradable. Therefore, industry efforts are leading to the development of non-toxic and environmentally friendly “green” corrosion inhibitors from renewable resources. Extensive studies of different bio-based inhibitors show that a vast number of phytochemicals can be used as efficient corrosion inhibitors. This paper provides a comprehensive review of the corrosion inhibition properties of plant-derived chemicals classified under the parameters provided by botanical chemistry.

Performance of green corrosion inhibitors from biomass in acidic media

Inhibitory Effect of Kopsia Singapurensis Extract on the Corrosion Behavior of Mild Steel in Acid Media

Inhibitive effect of Xylopia ferruginea extract on the corrosion of mild steel in 1M HCl medium

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Inhibitory Effect of Kopsia Singapurensis Extract on the Corrosion Behavior of Mild Steel in Acid Media

Inhibitive effect of Xylopia ferruginea extract on the corrosion of mild steel in 1M HCl medium