Diamond micro powder ( abrasive grain = 0 . 5 u m ) is added to the plating liquor , after many experiments , we discover every parameter of composite electro - brush plating , includes voltage of brush plating , relative velocity of between brush plating pen and workpiece , adding quantity of diamond micro powder etc . finally steel balls millstone covering with ni - fe - diamond composite electro - brush plating film is produced successfully 试验中加入粒度为w0 . 5的金刚石微粉，通过反复多次的试验，确定出了镍-铁-金刚石复合电刷镀中的各项工艺参数，包括电压、镀笔和工件的相对速度、金刚石微粉的加入量、温度等等工艺参数；成功的试制成了覆盖有镍-铁-金刚石复合电刷镀层的钢球研磨板。
