Electrical characteristics identification of dielectric film breakdown during plasma electrolytic oxidation process

A Novel Self-Adaptive Control Method for Plasma Electrolytic Oxidation Processing of Aluminum Alloys

“…At this point, the current increased sharply when the voltage was further increased, implying that higher voltages led to more pronounced discharge events. Figure 2d shows the trend of the oscillating current for voltages higher than 450 V. In these conditions, powerful discharges might occur, causing destructive effects in the sample as reported in previous literature [6,11]. In this work, an initial V b equal to 330 V and a V u value of 450 V were chosen.…”

“…Figure 4a shows the voltage and the current as a function of the measurement time: The voltage increased linearly in the 330–450V range and the current remained rather stable. These observations show that the current overshoot process, which occurs in the traditional voltage-control mode [6], was effectively suppressed. The current termination rule adopted in this work more effectively maintained a steady voltage in time, when compared to the more commonly used fixed-time methods.…”

“…A detailed description of the pulse test method and of the feature information extraction can be found in a previous work [6].…”

“…Extensive investigations on plasma electrolytic oxidation have been carried out in past years, due to its increasing use in industrial applications. Most of the research focuses on processing conditions [3,4,5,6,7,8], discharge characteristics [1,9,10,11,12,13], coating microstructure [14,15,16], mechanical properties [17], environmental performance [16,18], and functional characteristics [2,18]. As a result, the correlations [3,4,5,13,14,15,19] between the electrical conditions, the electrolyte compositions, the coating microstructure, and the growth rate of coating, which are linked via the characteristics of the discharges, have become clearer over recent years.…”

Effect of Current Mode on the Plasma Discharge, Microstructure and Corrosion Resistance of Oxide Coatings Produced on 1100 Aluminum Alloy by Plasma Electrolytic Oxidation

“…Several approaches have been employed for PEO process diagnostics including optical, spectral, electrical, acoustic, frequency response and electrochemical impedance spectroscopy [17]. Optical emission spectroscopy (OES) can provide valuable information on the plasma characteristics including electron number density, ionization temperature and elemental composition.…”