The final thesis examines the influence of electrolyte temperature and concentration on the efficiency of plasma electrolytic polishing (PeP) of metallic stainless steel samples. The aim of the research is to determine the appropriate processing conditions to achieve optimal surface roughness. Prior to PeP, all samples were sandblasted in order to obtain the most uniform initial surface roughness possible. The PeP process is carried out at a constant voltage of 320 V and a treatment duration of four minutes. Various concentrations of ammonium sulfate (0.15 M–0.75 M) and electrolyte temperatures (65–80 $^°$C) are used. Surface roughness parameters (Ra, Rz, Rp, Rv), mass, thickness, and edge geometry are measured before and after treatment. The results show that at concentrations of 0.15 M and 0.3 M, surface roughness is significantly reduced at all temperatures. Good results are also achieved at 0.45 M and 80 $^°$C, where the surface is smooth and the mass loss is low. Electrolyte concentration has a greater influence on polishing quality than temperature.
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