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Electrochemical study of Aspilia africana leaf extract for combating corrosion of mild steel corrosion in acid solutions

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Author Affiliations

  • 1Department of Science Laboratory Technology, Imo State Polytechnic, Umuagwo, Owerri, Nigeria
  • 2Department of Science Laboratory Technology, Imo State Polytechnic, Umuagwo, Owerri, Nigeria
  • 3Department of Science Laboratory Technology, Imo State Polytechnic, Umuagwo, Owerri, Nigeria
  • 4Department of Science Laboratory Technology, Imo State Polytechnic, Umuagwo, Owerri, Nigeria
  • 5Department of Science Laboratory Technology, Imo State Polytechnic, Umuagwo, Owerri, Nigeria

Int. Res. J. Environment Sci., Volume 12, Issue (1), Pages 1-7, April,22 (2023)

Abstract

The work studied the performance of Aspilia africana leaf (AAL) extract in retarding the corrosion of mild steel substrates in 0.5 MH2SO4 and 1.0 M HCl acid solutions. The inhibition performance and efficiency of the extract was studied using electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) measurements. The results of the study indicated that AAL extract effectively inhibited the dissolution of mild steel in the said acid solutions. The inhibition efficiencies of the plant extract increased as the concentration of the leaf extract increased. The leaf extract exhibited the maximum inhibition efficiency η(%) of 98.30% and 60.82% at 700mg/L in 0.5 M H2SO4 and 1.0 M HCl respectively using electrochemical impedance spectroscopy, while potentiodynamic polarization measurements reveal maximum inhibition efficiency η(%) of 81.25% and 54.55% at 700 mg/L in 0.5 M H2SO4 and 1.0 M HCl acid media respectively. The Tafel plots of the PDP showed that the inhibitor functioned as a mix-type inhibitor in which a decreased corrosion current density resulted as extract concentration was increased, suggesting an inhibiting effect. The AAL extract was found to retard corrosion via adsorption of the extract organic molecules on the mild steel and the blocking of the active sites by hindering dissolution of metal at the anode and evolution of hydrogen at the cathode.

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