Brass is an alloy of copper and zinc. The simplest brass is a copper-zinc binary alloy, called simple brass or plain brass. By changing the zinc content in brass, different mechanical properties of brass can be obtained.
The higher the zinc content in brass, the higher its strength and the slightly lower its plasticity. The zinc content of brass used in industry does not exceed 45%. A higher zinc content will produce brittleness and deteriorate the performance of the alloy. As we all know, copper is an active metal, very easy to oxidation corrosion.
Usually, in the production process, due to the needs of the process, for just after processing or just polishing treatment of copper parts, if there is no timely surface anti-oxidation protection treatment, then as fast as a few hours, as slow as three to five days, brass parts will appear oxidation, discoloration, surface rust and other oxidation phenomenon.
The traditional process is basically to use the application of anti-rust oil.
However, this process is not only inconvenient and unhygienic to operate, but also requires additional cleaning and grease removal process when it is to be used subsequently, which is costly and labor-intensive, causing headaches for all enterprises.
The addition of 1% tin to copper can significantly improve the resistance of brass to seawater and marine atmospheric corrosion, and also improve the cutting performance of brass. Then, after the copper passivation process, the oxidation resistance of brass can be effectively ensured.
In addition, the main purpose of adding lead to brass is to improve the machinability and wear resistance, and lead has little effect on the strength of brass. Manganese brass has good mechanical properties, thermal stability and corrosion resistance; adding aluminum to manganese brass can also improve its performance and get the castings with bright and clean surface.