Sustainable corrosion inhibitor for steel embedded in concrete by Guar Gum: Electrochemical and theoretical analyses

Abstract

Guar gum is recently being extensively used in a broad range of applications because of its distinctive physico-chemical properties. Guar gums have been used to prepare different concrete specimens. After the guar gum concrete has been scrutinized, the binding characteristics of the concrete are determined. Experimental studies using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDS), scanning electron microscopy (SEM), and quantum chemical calculations revealed that guar gum effectively protects structural steel from corrosion. The experimental analyses showed that 1.4% of guar gum exhibited maximum protection exhibited from maximum surface orientation values as 0.7874 and the same is fixed as optimum dose to examine the cooperative effect of counter ions on the corrosion progression. Furthermore, Monte Carlo (MC) simulations were used to investigate the surface interactions between the inhibitors and the metal surface. Finally, the results indicated that the ingredients of Guar Gum such as Mannose, Galactose, and Galactomannan have strong interactions with the surface of Fe (110) and thus have processed modelling inhibition strength against metal corrosion.

Keywords

• Guar Gum
• Potentiodynamic polarization
• Electrochemical impedance
• Quantum chemical theory
• Monte Carlo simulations