Preventing dezincification
When this amount of tin is added to cartridge brass, the resulting alloy is called admiralty brass. Further protection against dezincification is obtained if smaller amounts of arsenic, antimony or phosphorus, in the range of 0.02 to 0.1 wt%, are added to tin brass.
How can we prevent dezincification?
Alloying strategies to prevent dezincification
- Decreasing of zinc to lower than 15% .
- add Sn about 1% in brass 60/40.
- IF use copper content about 85% in alloys.
- Use inhibitor such as Tin element or add antimony, arsenic, phosphorus about 0.020%-0.6% (Zhang, Yaofu ,2009)
What causes dezincification?
Dezincification can be caused by water containing sulfur, carbon dioxide, and oxygen. Stagnant or low velocity waters tend to promote dezincification. To combat this, arsenic or tin can be added to brass, or gunmetal can be used instead.
