Publications Internationales

Now showing 1 - 3 of 3

Olive Leaf Extract as a Potential Anti-Corrosion of Copper-Nickel in Natural Seawater
(Springer Science and Business Media, 2025) Bourouis, Douniazed; Ghemmit-Doulache, Naima; Bounechache, Foudil; Trari, Mohamed
This study investigates the phenolic composition of olive leaves from Skikda region (Northern Algeria), focusing on their therapeutic potential for diabetes and hypertension due to their high content of phenols, particularly oleuropein. The leaves were dried, micronized and characterized by FT-IR spectroscopy. The obtained powder was subjected to various extraction techniques, including microwave, Soxhlet, Ultrasound-Assisted Extraction (USAE) and traditional maceration. The extracted compounds were analyzed by gas chromatography-mass spectrometry (GC/MS) and Ultra-High Performance Liquid Chromatography (UHPLC) coupled with electrospray ionization-quadrature-time-of-flight mass spectrometry (ESI-Q-TOF-MS). The presence of olivetol and two oleuropein isomers, highlighted the rich phenolic profile of the leaves. The study also examines the efficacy of olive leaf extract, particularly from traditional maceration, to prevent corrosion in the Cu-Ni alloy (90/10) seawater, one of the most corrosive environments. The results showed a high inhibitory efficiencies of 96.8% for the highest concentration (S1) by Tafel and 93% for the lower concentration (S3) by Electrochemical Impedence Spectroscopy (EIS). Scanning electron microscopy (SEM) and energy dispersive X-ray (EDS) analyses confirmed that the surface of the treated alloy remains free of corrosion, unlike the untreated alloy, which shows significant deterioration with a black corrosion layer attributed to the cuprite Cu2O. The study focuses on the identification of olivetol in olive leaf extract and its remarkable properties, for potential and preventive applications against corrosion
Experimental Approach to Monitoring the Degradation Status of Pipelines Transporting Hydrocarbons
(2021) Yahi, Sarah; Bensmail, Aicha; Haddad, Ahmed; Benmohamed, Manel
Improve the reliability of the gas and oil transportation process is a primary objective of the pipeline designers because it interests the safety of the goods and the people, the availability and the performance of pipelines as well as the economy of the hydrocarbon transport. Corrosion is a present phenomenon that occurs inside and outside of buried pipes, causing the pipeline to be pierced, leading to gas and oil leaks and causes consequences of the major economic losses. In this context, our study focused on the corrosion monitoring of metals used in the transport of hydrocarbons by two approaches based on electrochemical techniques. Monitoring the evolution of the corrosion potential using an elaborated reference instead of a commercial reference electrode, and by electrochemical impedance spectroscopy (EIS) coupled with the gravimetric method. The obtained results showed the efficiency of our approach for the realization of a corrosion sensor intended for the monitoring of corrosion in pipelines.
Mass transfer in a laminar elongational flow of a drag reducing surfactant
(Journal of Non-Newtonian Fluid Mechanics, 2002) Boutoudj, M.S.; Ouibrahim, A.; Deslouis, C.
The mass transfer given by an electrochemical reaction towards a rotating disk in a solution of surfactant having drag reducing abilities exhibits a first order transition. Beyond this transition marked by a significant slump of the mass transfer rate, the flow becomes unsteady and is characterised by an hysteresis cycle. This phenomenon was earlier observed for viscoelastic dilute solutions of linear polymers of high molecular weight and is induced by the elongational strain prevailing in the flow around a rotating disk. © 2002 Elsevier Science B.V. All rights reserved

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