extracting ellagic acid from the pomegranate fruit peels and its application as an inhibitor of carbon steel 45 corrosion in different media

This study suggests a solution to the corrosion issue faced by carbon steel by reducing corrosion and improving protection using a natural inhibitor, ellagic acid. the inhibitor ellagic acid is extracted from pomegranate fruit peels. it was characterized using fourier transform infrared spectroscopy (ftir). using the electrochemical polarization technique, the corrosion behavior of carbon steel 45 in 1m of hydrochloric acid (hcl) and a saline medium (artificial seawater 3.5% nacl) was investigated before and after using the different concentrations of inhibitor ellagic acid (0.01 and 0.05) m at four temperatures: 298, 303, 313, and 323 k. the thermodynamic parameter of the corrosion behavior of carbon steel in two media under study, which include: energy activation ea (15.101-6.738 kj/mole) enthalpy ∆h*(13.2105-4.847 kj/mole), entropy ∆s*(-0.1444- (-0.1932) j/mole), and free gibbs energy ∆g*(0.055 -0.061kj/mole) for 1m hcl and energy activation ea (4.21649-22.2536 kj/mol), enthalpy ∆h* (2.32529-20.3624 kj/mol), entropy ∆s*(-0.1861- (-0.15465) j/mol), and free gibbs energy ∆g*(0.0568-0.0656kj/mole) for 3.5% nacl before and after using the inhibitor, were also studied. the result showed that the inhibition efficiency values in the sodium chloride solution containing the inhibitor ranged from 93-97% at a concentration of 0.01 m and ranged from 97-99 % at a concentration of 0.05 m, and the inhibition efficiency values in the hydrochloric acid solution containing the inhibitor ranged from 91-94% at a concentration of 0.01 m and ranged from (95-96)% at a concentration of 0.05 m. atomic force microscopy (afm) analysis of the electrodeposited layers shows a protective coating layer of ellagic acid on carbon steel (c45).