汽缸套的金相检查,无论是高磷铸铁或是硼铸铁都应观察评定磷共晶或硼化物的网孔大小、数量、分布、块度等项目。近年来,我厂试用5%过硫酸铵水溶液试剂侵蚀试样(冷蚀10～20秒)效果较好,组织对比度明显。应用该溶液显示的磷共晶或硼化物的网孔、分布、块度也较清楚。见图(1、2)。 Cylinder liner metallographic examination, whether it is high-phosphorus cast iron or boron cast iron should be assessed to assess the phosphorus eutectic or boride mesh size, number, distribution, block and other projects. In recent years, I plant trial 5% ammonium persulfate solution erosion of the sample (cold etching 10 to 20 seconds) better, obvious contrast. Application of the solution shows the eutectic phosphorus or boride network, distribution, block size is also more clear. See figure (1,2).