Thermophysical Features of Plasma Electrolytic Treatment with Jet Feed of Electrolyte onto a Flat Surface

The paper presents studies of thermophysical characteristics of local plasma electrolytic treatment with jet feed of electrolyte to the treated area of a flat surface of stainless steel plate in an electrolyte based on ammonium chloride solution (10%). A description of a setup providing plasma electrolytic treatment of samples and small-sized workpieces with jet feed of electrolyte to a local area of the treated surface is presented. The influence of hydrodynamic parameters of treatment on the electrophysical characteristics of the process is studied with varying the distance between the sprayer and the treated surface, the diameter of the nozzle outlet, and the electrolyte flow rate. Effective hydrodynamic and electrophysical conditions for implementing local treatment, providing the possibility of carrying out chemical-thermal treatment of a flat metal surface, are determined. Models are proposed for calculating the temperature distribution in a thin metal plate during local treatment, on the basis of which methods for determining heat flows are developed. The influence of processing conditions on the heating temperature and its distribution over the surface, as well as heat exchange in the near-electrode region, is studied. The specifics of heat exchange of a low-temperature vapor-gas layer with a processed sample and an aqueous electrolyte is described. Dependences of heat flows into the sample and electrolyte on processing conditions are obtained.