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    A benzimidazolium salt as effective corrosion inhibitor against the corrosion of mild steel in acidic medium: experimental and theoretical studies
    (Taylor & Francis Ltd, 2022) Sahin, Neslihan; Kaya, Savas; Aydin, Ozkan; Katin, Konstantin P.; Chaouiki, Abdelkarim; Gurbuz, Nevin; Ozdemir, Ismail
    A new benzimidazolium salt (1-Allyl-3-(2,3,5,6-tetramethylbenzyl)-5,6-dimethylbenzimidazoliumchloride) is characterized by using H-1 NMR and C-13(H-1) NMR spectroscopies. The corrosion inhibition performance of benzimidazolium salt for mild steel in an acidic medium is investigated with the help of both experimental and theoretical tools. The experimental part of inhibition analysis includes the use of electrochemical impedance spectroscopy (EIS), linear sweep voltammetry, potentiodynamic polarization techniques, and surface characterizations are made. In the theoretical part, Density Functional Theory calculations are performed to discuss the corrosion inhibition efficiency using quantum chemical parameters. Molecular Dynamic Simulation calculation is made to analyze adsorption properties and characteristics of synthesized molecules on mild steel. Experimental studies show that the inhibition efficiency is calculated as 97.6% from EIS results for 5 x 10(-3) M inhibitor. Both experimental analyses and theoretical calculations proved that the studied inhibitor molecule is exhibiting higher inhibition efficiency.
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    A new application area of electrochemical limiting diffusion current technique: measurement of mixing time and effect of some parameters
    (Springer Int Publ Ag, 2019) Aydin, Ozkan; Arzutug, Mehmet Emin; Yapici, Sinan
    In this study, the electrochemical limiting diffusion current technique, which was employed first time for the mixing time measurement in the stirred tank system by the authors, was applied to determine the effect of some parameters on the global and local mixing times in the range of 3500 <= Re <= 10,000. The technique well sensed that increasing Reynolds number (Re), blade angle and blade number decreased the mixing time. The most effective parameter was observed to be Re, and the blade number and blade angle, in order. In addition, the mixing time was also investigated for solutions added in various volume fractions having different viscosity and density by using local mixing time measurement. It was determined that the mixing time decreased with the Reynolds number, the ratio of the initial solution volume to the total solution volume and the ratio of kinematic viscosity of the solution in the vessel initially to that of the added one viscosity. The ratio of initial solution volume to total solution volume was found to be a more effective parameter than the others in terms of mixing time.
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    A novel method for the measurement of mixing time: A new application of electrochemical limiting diffusion current technique
    (Elsevier Science Inc, 2018) Aydin, Ozkan; Yapici, Sinan
    The purpose of this work is to investigate whether the application of the electrochemical limiting diffusion current technique to the measurement of the mixing time in stirred vessels is possible; and if it is, then to establish a new technique for the measurement of the mixing time in the containers including liquids. For this aim, first the electrochemical limiting current conditions were determined, by observing the voltage-current change with the addition of a small amount of concentrated solution including active ions, that is, tracer, into the stirred system. Then, mixing time was determined by local and global measurements, employing both a local probe and one of the baffles as sensor, respectively. The comparison of the results with those of obtained by conductivity, which showed very good agreement, proved that electrochemical limiting current technique can be used as a means of measuring local and global mixing times as a cheap, simple, fast, straight forward and effective method.