Duplex Stainless Steel 2101 corrosion inhibition in an acidic environment using Solanum tuberosum leaves and roots extract

Abstract

The effectiveness of Solanum tuberosum (Potato) leaves (STPL) extract and Solanum tuberosum (Potato) roots (STPR) extract as corrosion inhibitor on Duplex Stainless Steel 2101(DSS2101) in 0.5M Hydrogen tetra oxo sulphate (IV) acid (H2SO4) solution were studied by weight loss, electrochemical potentiodynamic polarization and Fourier Transform Infrared Spectroscopy (FTIR) techniques. The increase in inhibition efficiency (IE) as the inhibitor dose increases show the effectiveness of inhibition. The FTIR spectrums of DSS2101 showed compounds of the extract that act as the inhibitor. The adsorption processes were calculated and discussed. The STPL and STPR isotherm adsorption behaviour on the surface of DSS2101 is known with isotherm adsorption of Langmuir and involves physical adsorption. The adsorption and protective thin layer formation cause an improvement in surface condition of the steel. The polarization curve results and thermodynamic parameters revealed that STPL and STPR provided inhibition in the H2SO4 acid environment.