Dapsone: A Novel Corrosion Inhibitor for Mild Steel in Acid Media
نویسندگان
چکیده
Corrosion inhibition of mild steel in 1 M HCl and 0.5 M H2SO4 by dapsone were studied by polarization resistance, Tafel polarization, electrochemical impedance spectroscopy (EIS) and weight loss measurement. Results obtained revealed that inhibition occurs through adsorption of the drug on metal surface without modifying the mechanism of corrosion process. Potentiodynamic polarization suggested that it acts as a mixed type predominantly cathodic in HCl and predominantly anodic in H2SO4. Electrochemical impedance spectroscopy was used to investigate the mechanism of corrosion inhibition. Thermodynamic parameters such as a E , ° a H , ° a S , ° ads H were calculated to investigate mechanism of inhibition. The adsorption of dapsone followed Langmuir adsorption isotherm.
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