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The inhibitive action of extract from mint leaves (EML) on Q235A hot rolled carbon steel (HRCS) in 0.5mol/L H2SO4 solution was studied using weight loss measurement, electrochemical polarization and scanning electron microscope (SEM) characterization. The results indicate that the extract functions as a good inhibitor. The inhibition efficiency of EML increases with rise in temperature and concentration. The max value of inhibition efficiency reaches 94.01% with addition of 320mg/L EML inhibitor in 0.5mol/L H2SO4 solution, at 50 o C. Chemical adsorption of EML components occurs on the surface of carbon steel according to the thermodynamic theoretic analysis. It is shown that the extract of mint leaves acts as a mixed type inhibitor according to the analysis from electrochemical polarization curves. The adsorption of the extract on hot rolled carbon steel obeys Langmuir's adsorption isotherm.

Electrochemical And Weight Loss Studies Of Extract From Mint As Green Corrosion Inhibitor For Carbon Steel In H2SO4 Solution