Corrosion inhibition effect of Nigella Sativa L extract (SE NS) on corrosion of mild steel in 1 M HCl solution was investigated using weight loss measurements, electrochemical polarization and EIS methods. Results obtained reveal that Nigella Sativa L extract acts as a mixed inhibitor without modifying the hydrogen reduction mechanism. The inhibition efficiency increases with increased Nigella Sativa L extract concentration to attain a maximum value of 99% at 2 g/L. The adsorption of natural product on the steel surface was found obey to Langmuir’s adsorption isotherm.
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