Adsorption and corrosion-inhibiting effect of Dacryodis edulis extract on low-carbon-steel corrosion in acidic media

Dacryodis edulis extract was studied as a corrosion inhibitor for mild steel in acidic media. The electronic structures of the extract components (A) ascorbic acid, (B) β-caryophyllene and (C) an alkaloid (HBMB) show that the molecules could be adsorbed on the corroding metal surface, and thus retar...

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Bibliographic Details
Published in:Journal of colloid and interface science 2010-09, Vol.349 (1), p.283-292
Main Authors: Oguzie, E.E., Enenebeaku, C.K., Akalezi, C.O., Okoro, S.C., Ayuk, A.A., Ejike, E.N.
Format: Article
Language:English
Subjects:
Acid corrosion
Acids - chemistry
Adsorption
Alkaloids - chemistry
Anodic
Ascorbic Acid - chemistry
Carbon - chemistry
Chemistry
Corrosion
Corrosion inhibitors
Corrosion mechanisms
Electrochemistry
Exact sciences and technology
Ferns - chemistry
General and physical chemistry
Inhibition
Media
Molecular Dynamics Simulation
Molecular modeling
Plant extracts
Plant Extracts - chemistry
Sesquiterpenes - chemistry
Steel
Steel - chemistry
Surface chemistry
Surface physical chemistry
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Summary:Dacryodis edulis extract was studied as a corrosion inhibitor for mild steel in acidic media. The electronic structures of the extract components (A) ascorbic acid, (B) β-caryophyllene and (C) an alkaloid (HBMB) show that the molecules could be adsorbed on the corroding metal surface, and thus retard the corrosion reaction. [Display omitted] ► The absorbed organic constituents inhibit corrosion. ► Inhibiting effects of the different extract constituents vary randomly. ► Their individual effects depend on envirionmental conditions. The inhibition of low-carbon-steel corrosion in 1 M HCl and 0.5 M H 2SO 4 by extracts of Dacryodis edulis (DE) was investigated using gravimetric and electrochemical techniques. DE extract was found to inhibit the uniform and localized corrosion of carbon steel in the acidic media, affecting both the cathodic and anodic partial reactions. The corrosion process was inhibited by adsorption of the extracted organic matter onto the steel surface in a concentration-dependent manner and involved both protonated and molecular species. Molecular dynamics simulations were performed to illustrate the process of adsorption of some specific components of the extract.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2010.05.027