Study of Near-Electrode Plasma and Electrode Surface During Discharges in Electrolytes

Abstract—

The cathode plasma of a discharge in an electrolyte based on sodium carbonate and sodium hydroxide is studied as well as its interaction with the surface of electrolytes made from tungsten, tantalum, and titanium. The electrotechnical properties of the discharge are measured by spectral methods and the electron temperature of the near-cathode plasma is determined. When tungsten electrodes are used, 0.2–1.5-µm-diameter thread-like structures appear on their surface. Interaction with the discharge current destroys tantalum electrodes. On the surface of titanium electrodes, 1–40-µm-diameter sphere-like formations and areas of a porous surface with a pore diameter of 0.1–1 µm are observed. The mechanism of the formation of these surface structures is discussed.

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Correspondence to D. L. Kirko.

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Translated by E. Voronova

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Kirko, D.L. Study of Near-Electrode Plasma and Electrode Surface During Discharges in Electrolytes. Plasma Phys. Rep. 46, 597–603 (2020). https://doi.org/10.1134/S1063780X20060045

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Keywords:

  • discharge in electrolyte
  • plasma interaction with metal surface
  • sphere-like formations
  • thread-like structures