Lead brass is a complex brass with lead as the main added element. It is made of four non-ferrous metals, Cu, Pb, Al, and Zn, in a certain ratio. Lead is rarely dissolved in copper-zinc alloys. It exists as an independent phase in the alloy and is distributed as free particles at the grain boundaries and in the grains. It has both lubrication and can break the chips into pieces, which can improve the machinability and wear resistance of brass. The machinability of lead brass is proportional to the lead content, but when the lead content exceeds 3%, it no longer significantly improves the machinability of copper, and reduces the hardness, strength, and elongation of brass. Therefore, the main properties of lead brass can be summarized as wear resistance, corrosion resistance, and good toughness... ...

Difficulty in sample preparation: It is extremely soft and easy to cause scratches.

Customer goal: Under the microscope, lead particles are clearly visible without scratches.