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The corrosion inhibition of carbon steel in a 1.0 M HCl solution, using 4-amino-2-(4 chlorophenyl)-8-(2,3-dimethoxyphenyl)-6-oxo-2,6-dih ydropyrimido[2,1b][1,3]thiazine3,7-dicarbonitrile (ACMPT) was investigated by weig ht loss, potentiodynamic polarization, electrochemical impedance spectroscop y (EIS) and quantum chemical calculations. Polarization curves indicate that the studied compound was acting as a mixed inhibitor with predominant cathodic effective ness. The inhibition efficiency decreased with an increased temperature, and the th ermodynamic and activation parameters obtained from this study were discussed. The adsorption behavior of ACMT follows Langmuir’s isotherm. In addition, Density F unction Theory (DFT) calculations were performed on the studied molecule. The theoret ical parameters obtained from this method are in good agreement with the experimental results.

portugaliae electrochimica acta

Experimental and Theoretical Studies of the Corrosion Inhibition of 4-amino-2-(4-chlorophenyl)-8-(2, 3-dimethoxyphenyl)-6-oxo-2, 6-dihydropyrimido [2, 1-b][1, 3] thiazine-3,7-dicarbonitrile on Carbon Steel in a 1.0 M HCl Solution