Greifswald 2024 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 2: Atmospheric Pressure Plasmas and their Applications I
P 2.5: Vortrag
Montag, 26. Februar 2024, 12:15–12:30, WW 1: HS
Spatio-temporal analysis of plasma electrolytic polishing: Insights from optical and electrical diagnostics — •Sehoon An1, Luka Hansen2, Thorben Wolff1, Rüdiger Foest1, Maik Fröhlich3, and Holger Kersten2 — 1INP Greifswald, Greifswald, Germany — 2Institute of Experimental and Applied Physics, Kiel University, Kiel, Germany — 3Leupold Institute of Applied Sciences, University of Applied Sciences Zwickau, Zwickau, Germany
Plasma electrolytic polishing (PEP) has recently gained much attention for its ecological benefits and its ability to enhance the surface quality of intricate metallic components. Understanding the dynamics of the gaseous layer around the workpiece, accompanied with electrical discharges, is crucial for optimal outcomes, as it significantly influences the surface modification effect. Here, we investigate the PEP process using optical and electrical monitoring, utilizing a high-speed camera synchronized with electrical waveform measurements. The temporal development of the temperatures of the workpiece and the surrounding electrolyte is measured and discussed in relation to the discharge characteristics. The experiment involves a WC-Co workpiece immersed in a 10 wt% Na2CO3 solution, anodically polarized at 120 V for 30 s. By high-speed video (1000 fps) a temporally resolved development of the gas layer involving numerous discharges on the workpiece surface is visualized which is correlated to the current signal. We report observations on oscillating discharge currents and characteristic frequencies, analyzed using FFT, in relation to process parameters and the workpiece temperature evolution.
Keywords: plasma electrolytic polishing; plasma in liquid; plasma electrolysis; plasma diagnostics; cemented carbide