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Pomegranate peels crude extract as a corrosion inhibitor of mild steel in HCl medium: Passivation and hydrophobic effect
Author(s) -
Ait Aghzzaf Ahmed,
VeysRenaux Delphine,
Rocca Emmanuel
Publication year - 2020
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.201911049
Subject(s) - corrosion , passivation , corrosion inhibitor , chemistry , extraction (chemistry) , carbon steel , antioxidant , electrochemistry , aqueous solution , polyphenol , solvent , chromatography , organic chemistry , layer (electronics) , electrode
Low‐toxic and cheap corrosion inhibitors are used for determining the durability of industrial equipment in acidic medium. The aim of the present study is to investigate the pomegranate peels crude extract (PPE) as a corrosion inhibitor of steel in 1 M HCl. The optimum yield of extraction, in terms of total phenolic content, was obtained by using a Soxhlet process in an aqueous solvent. The corrosion inhibition efficiency of PPE was investigated with stationary and dynamic electrochemical techniques. PPE acts as a mixed‐type corrosion inhibitor in very acidic medium, thanks to the formation of an organic layer made of various components, providing both a chemical antioxidant activity, likely due to the polyphenolic compounds, and a physical hydrophobic barrier against the aggressive environment, likely due to the filming properties of macromolecules as pectin or fatty acids.