Corrosion inhibition and adsorption characteristics of rice husk extracts on mild steel immersed in 1M H2SO4 and HCl solutions

K. K. Alaneme, Y. S. Daramola, S. J. Olusegun, A. S. Afolabi

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Abstract

Corrosion inhibition characteristics of extract of rice husk ash on mild steel in 1 M HCl and H2SO4 was investigated in this work. The study was carried out using mass loss, inhibition efficiency, atomic adsorption spectroscopy (AAS), FT-IR spectroscopy and surface analysis as bases for assessing the inhibition and adsorption properties of the extract in the acid solutions. The analyses of the results showed that the inhibition efficiency increased with increase in concentration of the inhibitor and decreased with temperature in both acid solutions. The efficiency of the extract in HCl (96%) was noted to be more than in H2SO4 (86%) solution. Thermodynamic parameters revealed that the adsorption of extract onto the metal surface was spontaneous. FTIR results showed that the inhibition mechanism was by absorption process, through the functional groups present in the extract. The SEM images of the corrosion product confirmed the protection offered by the extract on the surface of the metal immersed in both media. The data obtained were fitted into Langmuir and Freundlich adsorption isotherms though the Langmuir model was found to be better fitted than the Freundlich.

Original languageEnglish
Pages (from-to)3553-3567
Number of pages15
JournalInternational Journal of Electrochemical Science
Volume10
Issue number4
Publication statusPublished - Jan 1 2015

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All Science Journal Classification (ASJC) codes

  • Electrochemistry

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