Assessment of Performance of Velvet Tamarind-furfural resin as Corrosion Inhibitor for Mild Steel in Acidic Solution

Abstract

Furfural obtained from peanut husk by acid hydrolysis was utilized to form a resin with the pulp of Velvet Tamarind. The resultant resin was investigated as corrosion inhibitor for mild steel in 1 M HCl solutions by using weight loss, electrochemical impedance spectroscopy and potentiodynamic polarization measurements. The studies reveal that at constant acid concentration, Velvet Tamarind-furfural (VT-F) resin acts as an effective inhibitor for mild steel corrosion in 1M HCl media. Weight loss measurement showed that inhibition efficiency increased with extract concentration and exposure time but decreased with increase in temperature. Potentiodynamic polarization results showed VT-F resin to be a mixed type inhibitor in 1M HCl environment, whereas the impedance results revealed adsorption of the inhibitor species on the steel surface. The adsorption was in accordance with Langmuir adsorption isotherm and negative adsorption energy, Δðºoð‘Žð‘‘ð‘  obtained inferred that the adsorption rate was spontaneous.  Keywords: Velvet Tamarind-furfural resin, Corrosion Inhibitor, Mild Steel, Weight Loss, Electrochemical Impedance Spectroscopy and Potentiodynamic Polarization