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Subject: search.filters.subject.Chronoamperometry

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    A novel methodology for monitoring low-temperature corrosion caused by hygroscopic salts using linear polarization resistance
    (Elsevier, 2024) Yahi, Sarah; Bensmaili, Aicha; Lehmusto, Juho; Hupa, Leena; Haddad, Ahmed; Benmohamed, Manel; Vainio, Emil
    A new methodology for monitoring low-temperature corrosion caused by hygroscopic salts was developed and tested with ZnCl2. First, deliquescence and efflorescence points of ZnCl2 were determined by electrochemical impedance spectroscopy and chronoamperometry measurements in the range of 10–35 vol % H2O. Then, low-temperature corrosion was monitored using a probe that combines linear polarization resistance and mass loss measurements. Suitable potential and scan rate for the linear polarization resistance measurements were experimentally determined. The feasibility of the probe was tested by monitoring the corrosiveness of ZnCl2 on P235GH steel under different temperatures (100–180 °C) and water vapor concentrations (15–35 vol %). With the developed corrosion probe, corrosion caused by hygroscopic salts during changes in testing conditions can be monitored and evaluated.
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    Chlorophytum rhizosphere, a suitable environment for electroactive biofilm development
    (Springer, 2020) Tou, Insaf; Azri, Mounia; Sadi, Meriem; Zitouni, D.; Merad3, A. S.; Laichouchi, A.; Drouiche, N.; Lounici, H.; Gana-Kebbouche, S.
    The electroactivity of Chlorophytum rhizospheric soil using imposed potential chronoamperometry and a characteristic cyclic voltammetry was demonstrated in the present work. Five different polarizations were tested: − 0.3, − 0.155, 0, + 0.155, and + 0.3 V/SCE. The current density had stabilized around − 0.0068 mA/m2 and − 0.03 mA/m2 at − 0.155 and − 0.3 V/SCE, respectively. However, at 0, + 0.155, and + 0.3 V/SCE, a current density had reached respectively 1.46 A/m2, 1.48 A/m2, and 0.6 A/m2. The potential + 0.155 V/SCE seemed to better stimulate the electrogenic bacteria activity of the Chlorophytum rhizosphere. Different bacterial strains had formed electroactive biofilms in response to different electrode polarizations. The Chlorophytum rhizosphere electroactivity has depended on strict anaerobes as well as facultative anaerobic bacteria under anaerobic conditions. Furthermore, the Chlorophytum rhizosphere soil had closed almost equal proportions of Firmicutes and Proteobacteria whose electroactivity seemed to depend on the Proteobacetria more than the Firmicutes and had could be thereby a suitable environment for electroactive biofilm development
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    Study of scale inhibitor SI-4497 effect on calcareous deposit
    (Desalination Publications, 2021) Ghemmit-Doulache, Naima; Bourouis, Douniazed; Bounechache, Foudil
    Calcareous 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%