为了研究恒定电流密度下铝合金微弧氧化陶瓷膜的特性随处理时间的变化规律,在工作电流密度设定为25 A/dm2时制备了处理时间分别为1、3、5、10、20、30 min的样品共6块,并采用光学显微镜、显微硬度计、表粗糙度测量仪和SEM等手段对氧化陶瓷膜的形成机理进行了研究.结果表明,陶瓷膜表面呈圆饼状结构,圆饼的中心存在一个放电通道;膜的厚度、表面粗糙度、圆饼和放电通道的直径随处理时问线性增加;陶瓷膜的显微硬度与处理时间密切相关.
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