Abstract
Ethyl acetate extract (EAE) and butanolic extract (BE) of Thapsia villosa were investigated as corrosion inhibitors of Carbon Steel (CS) in 1 M H2SO4 using electrochemical impedance spectroscopy (EIS) techniques, potentiodynamic polarization and weight loss measurements. The effect of temperature on the corrosion behavior of CS was studied in the range of 20–40 °C. The experimental results show that EAE and BE are good corrosion inhibitors and the protection efficiency increased with increasing concentration of the extracts, but decrease with rise in temperature. The EAE and BE act as a mixed types inhibitors. The adsorption of extracts on CS surface follow Langmuir isotherm. The apparent energies, enthalpies and entropies of the dissolution process were discussed.
Highlights
Metals and alloys react electrochemically with the environment to form stable compounds, in which the loss of metals occurs
The increasing diameter of loop obtained in 1 M H2SO4 in the presence of Ethyl acetate extract (EAE) and butanolic extract (BE) indicated the corrosion inhibition and the strengthening of inhibitor film [18]
The results indicate that both extracts are good inhibitors for Carbon Steel (CS) in 1 M H2SO4 solution and the maximum inhibition efficiency was achieved using BE
Summary
Metals and alloys react electrochemically with the environment to form stable compounds, in which the loss of metals occurs. Organic compounds having functional groups such as -OR, -COOH, -SR and/or NR2 have been reported to inhibit corrosion of metals in acid solutions [4]. The presence of oxygen, sulfur, nitrogen atoms and multiple bonds in organic compounds enhances their adsorption ability and corrosion inhibition efficiency [1]. Most of these compounds are expensive, toxic and not biodegradable [5]. Extracts of some plants such as bupleurum lancifolium [6], Limonium thouinii [7], and Punica granatum [8] have been reported to inhibit the corrosion of metals in acid solutions
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