Publications Scientifiques
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Item Study of scale inhibitor SI-4497 effect on calcareous deposit(Desalination Publications, 2021) Ghemmit-Doulache, Naima; Bourouis, Douniazed; Bounechache, FoudilCalcareous deposits in water desalination generate serious problems and lead to considerable economic losses. The aim of this study is to investigate the inhibition of calcareous deposits using polyphosphonate (scale inhibitor SI-4497), which is an ideal additive for desalination operations. We studied the recovery rate of titanium electrode, in the presence and absence of this inhibitor, using chronoamperometry. A cathodic potential of –1.3 V/SCE (SCE – saturated calomel electrode) is used at 1,000 rpm and at 20°C, 40°C, 60°C, 80°C. Levich’s law is verified before and after 1 h of electrodeposition in presence of an inhibitor. It was found that electrode recovery decreases with the addition of 3.5 ppm polyphosphonate (scale inhibitor SI-4497), resulting in an efficiency of 63.65%Item The effect of surface treatments on the electrochemical behavior of titanium alloy in seawater by electrochemical impedance spectroscopy (EIS)(2015) Ghemmit-Doulache, Naima; Benserradj, S.Seawater contains many minerals, dissolved gases, including oxygen O2 cellular organisms, suspended solids and sediments that sometimes impart high turbidity. Chemical and biological characteristics of seawater make it a particularly aggressiv materials in particular titanium. Physico-chemical interactions between a metal material and its environment can lead to corrosion of material. Deterioration of metal due to microbial activity is called biocorrosion or corrosion induced by microorganisms (CIM). Because of its economic and environmental importance, CIM has been extensively over past five decades and several models studies have been proposed to explain the mechanisms biocorrosion observed. Many sectors are a facilities, plant thermal (heat exchangers). Biofilm formation on walls of conduits considerably reduces heat transfer, this is particularly important in case of heat exchanger tubes. We noted that electrode moves corrosion potential to more cathodic values. And more, the short stay of titanium in natural seawater, corrosion potential varies around - 250 mV/Ag/AgCl, and then it reaches less cathodic values to longer residence time. Electrochemical impedance measurements showed the presence of one loop relative to the capacitive charge transfer phenomenon of metal/passive layer. Keywords: Natural seawater, Titanium, OCP, Electrochemical impedance spectroscopyItem Electrochemical behaviour of the titanium-seawater interface at the Cape-Djinet, Boumerdes thermal station : influence of the potential, temperature, and brine(Taylor & Francis, 2015) Ghemmit-Doulache, Naima; Remli, AliItem Effect of marine biofilm on the electrochemical behavior of stainless steel and titanium(International Congress of Chemistry and Environment, 2015) Ghemmit-Doulache, Naima; Azzouni, B.; Meriouli, A.