Electrolyte Vortex Dynamics in the Vicinity of a Ferromagnetic Surface in a Direct Current Magnetic Field

Abstract

We propose a new method for determining the frequency characteristics of the rotational motion of an electrolyte flow during electrochemical reactions under the influence of an external magnetic field. The main advantage of the proposed method is the possibility to determine the frequency characteristics without introducing marker particles or other changes in the electrolyte or in the nature of the reaction. The effectiveness of this method is demonstrated by measuring the electrolyte rotation frequencies during the corrosion of a steel ball in an external magnetic field. It is shown that at the chosen experimental conditions the typical electrolyte rotation frequencies during etching of the steel ball are 0.88 and 1.7 Hz. The developed method can be used for determining corrosion areas of metallic compounds via in situ testing.

Technique for Determining Fluids Motion Characteristics in the Vicinity of Ferromagnetic Solids Under Magneto-Chemical Treatment

“…The steady component is not shown on the graph in order to improve the perception. The comparison of the obtained data with the theoretical and experimental studies [ 13 – 16 , 18 , 19 ] shows that the results are in the range of the characteristic frequencies of the magnetohydrodynamic (MHD) electrolyte mixing. The maximum of 1.7 Hz is much lower than the first one of 0.88 Hz and perhaps is the second harmonic.…”

“…In order to obtain an overall picture of the dynamic behavior of fluids that interact with metal surfaces under the influence of an external magnetic field, the method described previously in [ 13 ] was modified by changing the radiation source and geometry of filming (see Fig. 1 ).…”

“…For the current investigation, we used the steel ball (AISI 52100 Alloy Steel, manufactured according to GOST 801-78 [ 17 ]) mounted on a nonconductive holder and placed in a quartz electrochemical cell filled with a 7 % solution of nitric acid and the external magnetic field of 0.16 T. This corresponds to the experiment in [ 13 ]. The image was recorded by CELESTRON NexImage 5 camera in the mode of 52 frames per second.…”

“…The treatment of the obtained data was carried out in accordance with the algorithms described in details in [ 13 ]. An important feature of the present study to compare with [ 13 ] is that the Fourier transform was performed by using the floating window length. This allowed to determine the dynamic characteristics of the medium motion both for the whole duration of filming (Fig.…”

“…In our previous paper [ 13 ], we proposed the method for local measurement of the frequency characteristics of electrolytes motion. In order to obtain the dynamic picture of the behavior of fluids that interact with metal surfaces over the volume of the medium in the vicinity of magnetized surfaces, we modified the proposed method by changing the geometry of filming and radiation source.…”