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  • 1.
    Bark, Fritz H.
    et al.
    KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Mechanics of Industrial Processes.
    Vynnycky, M.
    A note on electrolysis with forced convection at large peclet number in a channel and an excess of supporting electrolyte2008In: Russian journal of electrochemistry, ISSN 1023-1935, E-ISSN 1608-3342, Vol. 44, no 4, p. 470-478Article in journal (Refereed)
    Abstract [en]

    Electrolysis of an aqueous solution of a metal salt with an excess of supporting electrolyte flowing in a two-dimensional channel is considered. The reaction kinetics is modeled by a Butler - Volmer law. The metal electrodes are symmetrically flush mounted in the channel walls, which are otherwise electrically insulating. Using the perturbation scheme originally proposed by Levich for electrolytes with an excess of supporting electrolyte, a solution in closed form, involving the root of a transcendental algebraic equation, is obtained for the polarization curve. For small and large values of the potential difference between the electrodes, explicit expressions for the polarization curve and the distributions of electric current and concentration on the electrodes are obtained. Particular attention is given to the conditions prevailing during the asymptotic approach to the limiting current.

  • 2.
    Ipek, Nulifer
    et al.
    KTH, School of Engineering Sciences (SCI), Centres, Faxén Laboratory. KTH, Superseded Departments, Mechanics.
    Lior, Noam
    University of Pennsylvania, Dept. Mech. Eng. and Appl. Mechanics.
    Bark, Fritz H.
    KTH, School of Engineering Sciences (SCI), Centres, Faxén Laboratory. KTH, Superseded Departments, Mechanics.
    Eklund, A.
    Avesta Sheffield AB.
    Alemany, Antoine
    Université Joseph Fourier, Lab. des Ecoulements Geophysique, Inst. de Mécan. de Grenoble.
    Simple analytical model predicting some features of the electrolytic steel-pickling process2002In: Russian journal of electrochemistry, ISSN 1023-1935, E-ISSN 1608-3342, Vol. 38, no 3, p. 238-246Article in journal (Refereed)
    Abstract [en]

    Electrolytic pickling of steel with neutral solutions, to remove the surface scale, reduces the need for the use of strong acids as needed in conventional pickling. This study is a step towards a more in-depth understanding of the factors affecting the former process. A theoretical model, sufficiently simplified to allow analytical solution, is developed and evaluated to provide a first approximation of the potential and current distributions in the electrolyte and steel band. To gain knowledge and validate the model, a small electrolytic pickling cell is constructed, and experiments, including bubble generation and motion observation, are conducted. The experimental work has shown the remarkable bubble production and adherence to the surfaces, and its effects on reducing pickling efficiency and uniformity. The pickling efficiency is about 30%, confirming other researchers' results. The analytical model shows trends very similar to those observed in the experiments, and provides very valuable guidance. It shows, for example, that the current efficiency decreases as the electrode-band distance increases, and it increases with the band thickness and the band-to-electrolyte conductivity ratio, The energy efficiency decreases by orders of magnitude faster than the current efficiency with all of the above-mentioned parameters, because of the correspondingly strong drop in the band-surface potential. A large amount of current is lost due to interelectrode short circuiting.

  • 3. Kravchenko, T A
    et al.
    Krysanov, V A
    Stolpovskii, A S
    Filatov, G A
    Zolotukhina, E V
    Zagorodni, Andrei A.
    KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
    Contribution of dimensional factor to the potential of copper-containing electron-ion exchangers2006In: Russian journal of electrochemistry, ISSN 1023-1935, E-ISSN 1608-3342, Vol. 42, no 3, p. 233-238Article in journal (Refereed)
    Abstract [en]

    The average size of copper particles in copper-containing electron-ion exchangers is determined with the aid of microscopy and x-ray diffractornetry. The results are used to calculate the contribution made by a dimensional factor to the electrode potential. Compared to the potential of compact copper, the potential shift in the negative direction measured experimentally falls within the region of calculated values. The average size of copper particles remains practically unchanged after contact with a copper sulfate solution. testifying to stabilization of an ultradisperse state of copper particles by a polymer matrix.

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