The aim of this paper is to study the properties of the materials for spacecraft surfaces under the effects of simulated low Earth orbit (LEO) plasma environment to understand the effects of charging and discharging phenomena, which are known to take place when spacecraft is moving through space plasma in LEO. Anodized aluminum Al₂O₃ samples were prepared using electrochemical techniques with different thicknesses to investigate the role of the Al₂O₃ coating in the charging and discharging phenomena. Penning plasma source is used to generate plasma using Ar gas flowing through the vacuum chamber. The peak current and the voltage waveform associated with charging and discharging processes, when a negatively biased voltage is applied to the substrate, are discussed. The structural properties before and after plasma exposure are investigated through the morphology and optical analyses of the samples. Morphological analyses confirmed the significant contribution of space plasma in the variation of the crystalline structure, and sample characteristics are dependent on the value of the thickness. In addition, the results confirm the variation of optical properties and the microcrystalline structure over the surface of the anodic oxide film.

本文的目的是研究模拟低地球轨道 (LEO) 等离子体环境影响下航天器表面材料的特性，以了解已知航天器通过时会发生的充电和放电现象的影响。 LEO 中的空间等离子体。使用电化学技术制备不同厚度的阳极氧化铝 Al ₂ O ₃样品，以研究 Al ₂ O _{3 的作用}镀层中的充放电现象。Penning 等离子体源用于使用流过真空室的 Ar 气体产生等离子体。讨论了当负偏置电压施加到基板时与充电和放电过程相关的峰值电流和电压波形。通过样品的形态和光学分析研究了等离子体暴露前后的结构特性。形态分析证实了空间等离子体对晶体结构变化的显着贡献，样品特性取决于厚度值。此外，结果证实了阳极氧化膜表面上的光学特性和微晶结构的变化。