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STUDY OF SILICON ANODIC BEHAVIOR IN ALKALINE ELECTROLYTE
Vasilevskaya S.I.
, Ph.D. student, e-mail:
Svetlana.vasilevskaya.87@mail.ruMakarov V.F.,
Master’s Degree student, e-mail:
lion77167@gmail.comNovosibirsk State Technical University, 20 Prospekt K. Marksa, Novosibirsk, 630073, Russian
Federation
Abstract
The paper discusses processes of electrochemical dissolution of silicon in a 5% aqueous
potassium alkaline electrolytes and sodium hydroxide (KOH, NaOH) in a stationary
(potentiodynamic) conditions and intensification of the sample surface. For polarization studies
following equipment is used: potentiostat model P – 5827M, a device for current registration and
three-electrode electrochemical cell. The object of study of this research is the silicic plate on a
metallic substrate with the area S = 0.22 cm
2
and thickness h = 0.3 mm. It is revealed that the
conditions under potentiodynamic method ECM in the range of potentials from 0 V to 2.5 V the
increase the current density 0.02 A / cm
2
is observed in KOH and up to 0.008 A / cm
2
in NaOH. At
potentials ranging from 2.5 V to 8 V the passivation process is occurs. It is found from the results
that the current density is increased during intensification of the surface in the entire investigated
range of potentials of from 0 V to 8 V. It is determined that the current density increased in 10 times
under mechanical surface stripping in electrolytes in the potential range of 0 V to 8 V.
Keywords
anodic behavior, electrolyte, silicon, and intensification of the surface, the polarization
dependence, potential, current density, electrochemical machining