Abstract
Atmospheric corona discharge devices are being studied as innovative systems for cooling, sterilization, and propulsion, in several industrial fields, from robotics to medical devices, from drones to space applications. However, their industrial scale implementation still requires additional understanding of several complex phenomena, such as corrosion, degradation, and fatigue behaviour, which may affect final system performance. This study focuses on the corrosive behaviour of wires that perform as a high-voltage electrode subject to DC positive corona discharge in atmospheric air. The experiments demonstrate that the non-thermal plasma process promotes the growth of the oxidative films and modifies the physicochemical properties of the materials chosen as corona electrodes, hence affecting device operation. Surfaces exposed to this non-thermal plasma are electrically characterized by negative exponential decay of time-depend power and analysed with SEM. Implications on performance are analysed and discussed.
Highlights
Atmospheric corona discharge devices are being studied as innovative systems for cooling, sterilization, and propulsion, in several industrial fields, from robotics to medical devices, from drones to space applications
Tests are performed to determine the behaviour of different corona electrodes materials exposed, during relevant amounts of time, to positive corona discharge at high voltages typical from real operation
Under the corona discharge effect, the thermophysical properties of electrode materials play an essential role in erosion
Summary
Atmospheric corona discharge devices are being studied as innovative systems for cooling, sterilization, and propulsion, in several industrial fields, from robotics to medical devices, from drones to space applications. The variation of the experimental and environmental conditions causes changes in the global power and overall performance of the device Conditions such as local humidity, ambient temperature, ionization medium, applied voltage or degradation of the electrodes, can affect device stability by producing continuous electric arcs, causing a non-uniform discharge[17,18,19]. Numerous investigations have focused on studying the erosion instigated by electrodes subjected to electric discharges with a high current density, point heating due to the presence of electric arcs and high applied voltage[20,21,22] Under these conditions, micro-explosions are originated, due to a local concentration of high energy and overheating of the metal (leading to ecton production[22,23]). With a current density of 1 A/ cm[2], Weissler has reported the formation of craters, due to the mechanism of ecton erosion, as a consequence of the appearance of accumulated metal on the sides of the rounded tip
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