Publications Scientifiques

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Author: search.filters.author.Bounoughaz, MoussaSubject: search.filters.subject.EIS

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    Study of the Influence of Metal Surface Quality on the Performance of an Epoxy Coating
    (Elsevier, 2023) Boudieb, Naima; Bounoughaz, Moussa; Hamidouche, Fahim; Ghebache, Zohra
    In the present work, an EC used for steel corrosion protection was characterized by Ec techniques. This study aimed to describe the effect of the steel roughness surface on the performance of EC, through EIS and other methods. The studied metal was a low-strength CS immersed in a 3.5% NaCl solution. The CS surface was obtained by polishing it (metal electrodes) with an abrasive paper of 120, 600 and 1200 mesh. Then, the electrodes were painted with an anti-corrosive EC, which contained Zn3 (PO4)2 as an anti-corrosion agent. The study of the influence of the CS surface Ra and its corrosion behaviour and of the evolution of the protective capacity systems on the EC performance was made by stationary (Ecorr and Tafel plot) and no-stationary Ec techniques (EIS and CA). In order to confirm the detachment and blistering on the coating, the coated CS samples were analyzed by a salt spray in a 7.69 % NaCl solution, with an IT of 15 days. The obtained results showed that the CS surface state directly influenced the coating performance and the Ec parameter values variation, as a function of IT in the NaCl solution. EIS was the most valid Ec method for the studied coatings.
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    Evaluation efficiency of barium sulfate scale inhibitors by electrochemical impedance spectroscopy
    (2016) Labraoui-Djallal, Karima; Bounoughaz, Moussa
    The electrochemical behaviour of carbon API 5L X70 grade steel electrode towards barium sulfate scaling and scaling inhibitors is investigated in this paper. A study of the carbon steel/injection water interface, with and without inhibitor, was carried out using electrochemical impedance spectroscopy (EIS). The scanning electron microscopy (SEM) and the X-ray diffraction study, in the absence of scale inhibitors, revealed the formation of a thick layer on the surface mainly composed of barium sulfate BaSO4. The barium sulfate scale is formed naturally and evolves with the immersion time. EIS spectra, in uninhibited medium, present three capacitive loop corresponding to transfer charge resistance, deposit resistance and porous resistance. The effectiveness of scale inhibitors used in oil fields pressure maintaining systems is evaluated. The EIS spectra in the presence of the inhibitors show the decrease of the resistances reveal that the scaling inhibitors effect is a tendency to form low amounts of barite solid precipitated on the electrode surface and their inhibiting efficiency increases with concentration rise