Theoretical and Experimental Investigations of the Corrosion Inhibition Action of Piliostigma Thonningii Extract on Mild Steel in Acidic Medium

Authors

  • P. O. Ameh

    Nigeria Police Academy, Wudil, P. M B. 3474, Kano State Nigeria
    Author
  • N. O. Eddy

    University of Nigeria, Nsukka, Enugu State, Nigeria
    Author

Keywords:

Mild steel, corrosion inhibition, Piliostigma thonningii leaf, experimental and theoretical considerations

Abstract

The search for green corrosion inhibitor for mild steel in solution of HCl was implemented in this work by using electrochemical polarization, gravimetric and thermometric techniques to investigate the corrosion inhibition efficiency of ethanol extract of Piliostigma thonningiil leaf. Results obtained from weight loss and thermometric measurements indicated that the inhibition efficiency of ethanol extract of Piliostigma thonningii leaf ranged from 65.12 to 79.55 % and from 73.61 to 88.16 % respectively. The ranges for inhibition efficiencies from, linear and potentiodynamic polarization measurements were 66.40 to 89.97 % and 51.29 to 85.53 % respectively Active components of the extracts that synergistically cooperated to enhance their adsorption on mild steel surface (and hence corrosion inhibition) were identified through GCMS analysis and they included 1,1,7-trimethyl-4-methylenedecahydro-1H-cyclopropa[e]azulene; hydroquinone; 3-tridecene; 3,5-bis(1,1-dimethylethyl)-phenol; Pentadecanoic acid; 1- ethenyl-1-methyl-2,4-bis(1-methylethenyl)-cyclohexane and 9-oxa-bicyclo[3,3,1]nona-3,6- dien-2-one. Results from quantum chemical calculations revealed that these compounds (apart from meeting the basic requirements for corrosion inhibition) are characterized by frontier molecular energy values that are unique for well-known corrosion inhibitors.

 

Author Biographies

  • P. O. Ameh, Nigeria Police Academy, Wudil, P. M B. 3474, Kano State Nigeria

    Physical Chemistry Unit,

    Department of Chemistry

  • N. O. Eddy, University of Nigeria, Nsukka, Enugu State, Nigeria

    Department of Pure and Applied Chemistry

Theoretical and Experimental Investigations of the Corrosion Inhibition Action of Piliostigma Thonningii Extract on Mild Steel in Acidic Medium cover image

Downloads

Published

2018-11-04

Similar Articles

1-10 of 62

You may also start an advanced similarity search for this article.