超声波清洗机中，清洗效果是随着超声波功率密度增加而进步的。但过高的功率密度会由于空化作用过份激烈而惹起被清洗件外表的浸蚀，从而使被清洗件外表遭到损伤。这种现象特别对工件上的各种镀层以及铝合金件更为突出。

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