试样制备有色金属试样的制备基本与黑色金属相同。有色金属质软,粗磨时砂纸颗粒剥落易刮伤预制表面,一般宜加入少许汽油或煤油,以润滑和保护磨面。试样粗抛后再用氧化镁精抛。由于氧化镁在潮湿空气或水中易结块,而生成不溶于水的碳酸镁粗粒,以致失去抛光作用,因此最好用蒸馏水将氧化镁粉调匀,并加入少许酒石酸铵,经煮沸后立即使用。此时抛光液细 Sample Preparation Non-ferrous metal samples are basically the same as ferrous metals. Non-ferrous metals are soft, coarse abrasive sand particles peeling easy scratched prefabricated surface, the general should add a little gasoline or kerosene to lubricate and protect the grinding surface. After the rough sample throwing magnesium oxide polishing. Magnesium oxide in humid air or water easy caking, and generate water-insoluble magnesium carbonate coarse particles, resulting in loss of polishing, it is best to use distilled water to mix the magnesium oxide powder, and add a little ammonium tartrate, boiled immediately after use . At this point polishing liquid fine