European Journal of Chemistry volume 1, issue 2, P129-133 2010 DOI: 10.5155/eurjchem.1.2.129-133.52

Inhibitive action of Bridelia retusa leaves extract on corrosion of mild steel in acidic media

Niketan Patel, Anamika Rawat, Smita Jauhari, Girish Mehta
Abstract: KEYWORDSExtract of Bridelia retusa leaves was investigated as corrosion inhibitor of mild steel in 1 N H2SO4 using conventional weight loss, electrochemical polarizations, electrochemical impedance spectroscopy and scanning electron microscopic studies. The weight loss results showed that the extract of Bridelia retusa leaves is excellent corrosion inhibitor and electrochemical polarizations data revealed the mixed mode of inhibition. While the results of electrochemical impedance spectroscopy have shown that the change in the impedance parameters, charge transfer resistance and double layer capacitance, with the change in concentration of the extract is due to the adsorption of active molecules leading to the formation of a protective layer on the surface of mild steel. Scanning electron microscopic studies provided the confirmatory evidence of improved surface condition, due to the adsorption, for the corrosion protection.Bridelia retusa Acid corrosion inhibitor Electrochemical polarization Electrochemical impedance spectroscopy Scanning electron microscopy Mild steel
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