Evaluation of Fuji apple peel extract as a corrosion inhibitor for carbon steel in a saline medium

ROSA DE LAS MERCEDES VERA ARAVENA, Francisco Figueredo, Andrés Díaz-Gómez, Aurora Molinari

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5 Scopus citations

Abstract

The present study evaluated the activity of extract obtained from the peel of Fuji apples (Malus Domestica) harvested in the region of Valparaiso, Chile, as a potential corrosion inhibitor for carbon steel in a saline medium. The total phenol and flavonoid content in the extract was measured and its main components were identified using HPLC-MS. The inhibition efficiency of the extract was evaluated by mass loss measurements, Tafel polarisation curves and electrochemical impedance spectroscopy, obtaining an inhibition percentage of around 90% at a concentration of 1000 ppm of extract. Adsorption of the extract's components on the surface of the steel followed the Langmuir adsorption isotherm model, implying a physisorption mechanism based on thermodynamic parameters and from the ΔGads0 value, which was calculated at -15.16 KJ/mol. SEM was used to verify the presence of an organic layer on the steel, corroborating the adsorption of the organic components from the extract blocking active sites on the steel.

Original languageEnglish
Pages (from-to)4139-4159
Number of pages21
JournalInternational Journal of Electrochemical Science
Volume13
Issue number5
DOIs
StatePublished - 1 May 2018
Externally publishedYes

Keywords

  • Adsorption
  • Carbon steel
  • Chloride inhibition
  • Fuji apple

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