corrosion inhibition of api 5l carbon steel by nettle leaves hydroalcoholic extract in a 0.5 m h2so4 solution

In this work, electrochemical methods such as tafel polarization and electrochemical impedance spectroscopy (eis) were used to study the inhibition efficiency of nettle leaves hydroalcoholic extract as a green corrosion inhibitor of api 5l carbon steel in 0.5 m h2so4 solution. the results showed that the inhibition efficiency was increased withincreasing the concentration of the extract and the maximum inhibition efficiency in the concentration of 6 g/l was 96%. the negative sign δg^0 ads absorption of inhibitor on the steel surface was spontaneous and the value δg^0 ads represented the physical absorption of the inhibitor which followed the langmuir isotherm.