Study of the corrosion and inhibition mechanism for carbon steel and zinc alloys by an eco-friendly inhibitor in acidic solution

Abstract

The inhibitory nature, thermodynamics and adsorptive properties of Phaseolus vulgaris L. extract, known as Fasolia seed extract were evaluated for carbon steel and zinc alloy corrosion in 0.5 M HCl using potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. Theoretical fittings for kinetic-thermodynamic and Flory–Huggins models have been studied in order to elucidate the mode of adsorption of P. vulgaris L. seed (PS) extract on zinc alloy and carbon steel. The findings have shown that the mechanism of adsorption occurs through electrostatic interactions between the extract molecules and the metal surface.

Keywords:

• Adsorption
• carbon steel
• corrosion inhibition
• EIS
• natural extract
• zinc alloy

Disclosure statement

No potential conflict of interest was reported by the authors.