Abstract

Protective oxide coatings are developed on aluminum substrate through plasma electrolytic oxidation using a pulsed current and within the alkaline electrolyte. The morphology and corrosion resistance of the oxide layer established under a pulsed current condition have been previously carried out. Since the frequency is one of the main characteristics of the pulse current, the results were performed to investigate the effect of this factor. As the results specified, by increasing the pulse frequency, power of each pulse is individually reduced; therefore the required strength to break the dual capacitive layer on the sample surface is reduced. As a result, ignition is initiated at a higher voltage. The results show that with increasing time at a frequency of 10 000 Hz and duty cycle of 25% the thickness was increased exponentially. It is also revealed that applying pulses with a higher frequency, can improve corrosion resistance significantly.

中文翻译：

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脉冲电流频率对铝上等离子体电解氧化形态和腐蚀行为的影响

摘要

通过使用脉冲电流的等离子电解氧化在碱性电解质内在铝基材上形成保护性氧化物涂层。先前已经进行了在脉冲电流条件下建立的氧化物层的形态和耐腐蚀性。由于频率是脉冲电流的主要特征之一，因此进行了研究以研究该因素的影响。根据指定的结果，通过增加脉冲频率，可以分别降低每个脉冲的功率；因此，降低了破坏样品表面上的双电容层所需的强度。结果，在较高电压下开始点火。结果表明，随着时间的增加，频率为10000 Hz，占空比为25％，厚度呈指数增加。