Use of Opuntia ficus extract as a corrosion inhibitor for carbon steel in acidic media

Abstract

Purpose – The purpose of this investigation is to study the corrosion inhibition of carbon steel (CS) using a “green” inhibitor, Opuntia ficus-indica, in an aerated, 0.5 M H2SO4 solution at different concentrations and temperatures. Design/methodology/approach – Weight loss determinations, surface studies, electrochemical impedance spectroscopy and potentiodynamic polarization were applied during the investigation. Findings – It was observed that Opuntia ficus-indica extract can decrease the corrosion rate of CS, and its efficiency increases with increasing concentration up to 1,000 ppm and with time, but decreases with increasing the temperature from 25 to 600C. The inhibitory activity is due to the presence of phenolic compounds in its chemical structure. Research limitations/implications – The work was done under static conditions, whereas in acid cleaning conditions, there is a dynamic system. However, the findings may apply to both the systems. Practical implications – CS is used in acidic environments in the acid cleaning industry. Social implications – Results of this work show that it is possible to reduce the cost of repair of equipment and the environmental impact of corrosion. Originality/value – There are very few investigations on the study of Opuntia ficus-indica leaf extract as a green inhibitor in an acidic environment.

A peony-leaves-derived liquid corrosion inhibitor: protecting carbon steel from NaCl

“…The real part of the surface impedance increases with the inhibitor concentration and time, reaching a maximum value with 3 vol.% of PLS inhibitor at day 16. This indicates that by increasing the concentration of PLS and over time, the density of the protective layer formed on the surface of metal is increased (61). Similar shape of the capacitive loops suggests that the corrosion inhibition process followed the same mechanism and is controlled by charge transfer process, regardless of the inhibitor concentration and immersion time.…”

“…As such, the R ct values confirm that the PLS inhibition efficiency increased with its concentration (at day 16). The decrease of C dl value can be attributed to the decrease in the local dielectric constant and the increase in the thickness of electric double layer (61). This shows that the water molecules and other ions on the surface of metal have been displaced by peony leaves extract molecules through adsorption at the metal/solution interface (72).…”

Characterization of Tannin-Based Resins from the Barks of <i>Ficus platyphylla</i> and of <i>Vitellaria paradoxa</i>: Composites’ Performances and Applications

“…Indeed, the peak at 1607 cm −1 is attributed to the vibrational motions of C=C in the aromatic rings [25]. The peaks at 1371 cm [33]. Such residues are not new in the structures of condensed tannins, as already highlighted by Navarrete et al [10].…”

Mechanism of corrosion protection in chloride solution by an apple-based green inhibitor: experimental and theoretical studies

“…The C dl values decreased with increases in the concentration of APE, which can be ascribed to the reduction of double layer dielectric constant [10]. This means a thicker electrical double layer, which is caused by more displacement of corrosive species by APE molecules at the steel/electrolyte interface [57,75]. By increasing the concentration of APE, the values of R ct increased which could translate to higher inhibition efficiencies [26].…”