Inhibition Effect and Adsorption Behavior of New Azodye Derivatives on Corrosion of Carbon Steel in Acid Medium

Abstract

The inhibition effects of synthesized azodye derivatives on carbon steel corrosion in 2.0 M HCl were studied using weight loss, potentiodynamic polarization, and electrochemical frequency modulation (EFM) techniques. Potentiodynamic polarization measurements show that azodye derivatives are mixed-type inhibitors. EFM can be used as a rapid and non destructive technique for corrosion rate measurements without prior knowledge of Tafel constants. The results obtained from weight loss, potentiodynamic polarization and EFM measurements were in good agreement. Adsorption of these inhibitors on the surface on carbon steel follows the Langmuir adsorption isotherm. The surface of carbon steel examined using UV-vis reflectance spectroscopy. Quantum chemical calculations have been performed and several quantum chemical parameters were calculated and correlated with the corresponding inhibition efficiencies.

Keywords:

• Adsorption mechanism
• carbon steel
• inhibition efficiency
• quantum chemical calculation