Cupressus sempervirens extract as green inhibitor for corrosion of carbon steel in hydrochloric acid solutions

The effect of an aqueous extract of Cupressus sempervirens on the corrosion manner of carbon steel in 1M hydrochloric acid solution has been measured by mass reduction, hydrogen evolution, electrochemical frequency modulation (EFM), potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) methods The efficiency of Cupressus sempervirens extract was examined with increasing dose of the extract and the temperature. The parameters of thermodynamic of corrosion and adsorption processes were measured and discussed. The extract was adsorbed on surface of metal chemically and was obtain obey Temkin isotherm. The potentiodynamic polarization resulted lead to the extract is mixed inhibitor type. The results given from the various methods were in best agreement.