Physico-Chemical nanomaterials science

Vortex motion of electrolyte at the electrolytic deposition of nickel in an external magnetic field
Derecha D.O.1,5, Skirta Yu.B.1,2, Gerasimchuk I.V.1,2, Hruzevyich A.V.1,3, Samchenko D.M.4, Kochetov G.M.4
1 Institute of Magnetism, Natl. Acad. Sci. Ukraine and Min. Edu. Sci. Ukraine, Akad. Vernadsky Blvd. 36-b, Kyiv 03142, Ukraine 
E-mail: dderecha@gmail.com
2 National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”, Peremohy Ave. 37, Kyiv 03056, Ukraine 
3 Trypilska TPP, Promyslova Str. 1, Ukrainka 08720, Kyiv Rgn., Ukraine 
4 Kyiv National University of Construction and Architecture, 
Povitroflotsky Ave. 31, Kyiv 03037, Ukraine 
5 Physico-technological Institute of Metals and Alloys. 
34/1 Academician Vernadsky Blvd., Kyiv 03680, Ukraine.

The influence of the magnetic field on electrolysis, corrosion and other aspects of the interaction of metal surfaces with electrolytes attracts much attention nowadays. Earlier the effects of a significant acceleration of corrosion of metals in electrolytes in a constant magnetic field and the emergence of multi-vortex structures in electrolytes under the influence of a constant magnetic field were observed. Electrodeposition of metals has been successfully used to create surfaces with desired properties. 
We observed and analyzed the vortex motion of the electrolyte during the electrolytic deposition of nickel on a ferromagnetic mesh electrode in an external magnetic field. The characteristic frequencies of rotation of the electrolyte were found by optical methods developed by us earlier. This rotation is in many aspects similar to the processes occurring during the dissolution of a steel ball in nitric acid in a magnetic field. The calculated spectrum shows maxima corresponding to the characteristic frequencies of the electrolyte motion. The most intense maxima correspond to the frequencies of 0.161 Hz, 0.337 Hz and 1.113 Hz. The presence of clearly pronounced maxima shows that the motion of the electrolyte is ordered, cyclical, and not chaotic. 
The proposed method, with some modifications, can be used to study the frequency characteristics of the motion of liquids, gases and small objects without directly affecting the medium under investigation.