Corrosion inhibition of carbon steel in 1 M H2SO4 solution by Thapsia villosa extracts

Abstract

Ethyl acetate extract (EAE) and butanolic extract (BE) of Thapsia villosa were investigated as corrosion inhibitors of Carbon Steel (CS) in 1 M H 2 SO 4 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.

Adsorption and Corrosion Inhibition Properties of Butanolic Extract of Elaeoselinum thapsioides and Its Synergistic Effect with Reutera lutea (Desf.) Maires (Apiaceae) on A283 carbon Steel in Hydrochloric Acid Solution

“…Various studies has been reported recently regarding the inhibition efficiency of different plants extract against steel corrosion: Holoptelea integrifolia leaves [9], lychee fruit [17], Curcuma longa extract [18], Aloe Vera leaf [19], Thymus Vulgaris [20], Egyptian licorice [21], Coreopsis tinctoria [22]. Among plant materials tested in our laboratory are: Bupleurum lancifolium (Apiaceae) [23], Saccocalyx satureioides [24], Thapsia villosa [25], Echium italicum L [8], Reutera lutea (Desf.) Maire (Apiaceae) [26].…”

Corrosion Inhibition of Aluminum Alloy (R408, R613) in Sodium Hydroxide Alkali Medium by Expired Drug of Ketoprofen

“…The following expression was used to compute the corrosion rate (CR corr). [12] In this formula, (CR) stands for corrosion rate, (W) for weight loss (measured in grams), (A)…”

Mathematical Relationship Based on Experimental Data, for Corrosion Inhibition Mechanism of Phenolic Compounds Obtained fromEchium italicumL.

“…Electrochemical impedance spectroscopy (EIS) experiments were conducted in the frequency range of 100 kHz-10 mHz with a signal amplitude perturbation of 10 mV at open circuit potential (OCP) measured during 60 min of immersion in the tested solutions. The percentage of the inhibition efficiency η w % ðÞ was calculated using the polarization resistance by the following relationship [36]:…”