Views:40 Author:Site Editor Publish Time: 2020-12-31 Origin:Site
Zinc-based alloys are the easiest to die cast. High ductility and excellent impact strength make these alloys suitable for a variety of products. Zinc die castings can provide thin walls and excellent surface smoothness, easily for electroplating and spraying relatively.
High strength and hardness
High thermal conductivity
Low-cost raw materials
High dimensional accuracy and stability
Excellent thin wall capability
Can be cold-formed, easy to connect
High-quality finishing features
Excellent corrosion resistance
Zinc alloy 2, also known as Zamak 2 (ASTM AC43A), is the highest strength and hardness in the Zamak alloy series. This alloy has excellent casting characteristics, including:
Higher creep performance than other Zamak alloys.
Compared with aluminum die-casting alloy, it has excellent damping ability and damping effect.
High strength and hardness after long-term aging.
Zamak 3 (ASTM AG40A) or Zinc Alloy 3 is the most widely used in North America. For many reasons, it is usually the first choice when considering zinc alloy die casting.
The ideal balance for physical and mechanical capacities.
Excellent castability and long-term dimensional stability.
Electroplating, painting, and chromate treatment have excellent surface treatment characteristics.
Compared with aluminum die casting alloy, it has excellent damping ability and damping effect.
Zamak 5 (ASTM AC41A) or zinc alloy 5 is the most widely used zinc alloy in Europe.
It has a higher copper content than Zamak 3, so it is stronger.
Its ductility (decrease in elongation) is lower than Zamak 3.
The designer must remember that the decrease in ductility will affect the formability during secondary processing (such as bending, riveting, forging, or crimping operations).
Due to the wide availability of Zamak 3, component engineers usually enhance components through design modifications rather than using Zamak 5.
When it is necessary to measure tensile properties, Zamak 5 castings are recommended.
Compared with alloy 3, Zamak 5 is easier to plate, finish, and machine.
Zamak 7 (ASTM AG40B) or zinc alloy 7 is an improved form of Zamak 3. It is a high-purity alloy with lower magnesium content and stricter impurity specifications. This can improve the fluidity, ductility, and surface finish of the casting.
Zamak 7 is mainly for special hardware applications, or when castings require additional formability during subsequent assembly processes such as crimping or riveting. Its higher fluidity also allows thinner walls casting.
Sometimes higher fluidity is required, especially on zinc die casting parts with complex details.
To avoid casting parts' excessive flash, it is necessary to have good mold compatibility and strictly control the casting process parameters.
The high ductility exhibited also affects processing, but it is mainly to remove and trim flash during secondary processing.
Compared with aluminum die casting alloy, Zamak 7 has excellent damping ability and vibration attenuation.
ZA-8 or zinc-aluminum alloy contains more aluminum alloy than Zamak combination gold. ZA-8 contains about 8.4% aluminum and is the only ZA alloy that can be die-casted in a hot chamber. This is an important consideration when selecting component materials.
ZA-8 has excellent surface treatment and electroplating properties and was developed as a permanent mold alloy.
Although its casting characteristics are not as good as other zinc alloys, it can significantly improve strength, hardness, and creep properties.
In terms of mechanical properties, ZA 8 has the highest creep strength among all zinc alloys. And it is the highest strength alloy among all hot chamber die-cast zinc alloys.
ZA-12 is the best gravity casting alloy for sand molds, permanent molds, and graphite molds. It is also a high-quality (cold chamber) die casting alloy. ZA-12 often competes with ZA-27 in strength applications. ZA-12 is an excellent bearing alloy. Although the coating adhesion is reduced compared with the traditional zinc alloy, it is also plateable.
ZA-27 or zinc-aluminum alloy contains more aluminum than Zamak combination gold. The number 27 represents the approximate percentage of aluminum.
ZA-27 has the highest aluminum content, the highest strength, the highest melting point, and the lowest ZA group density.
This zinc alloy has excellent bearing performance and can be designed as castings for certain applications.
Its higher casting temperature requires a cold chamber process.
Intricate reticulated zinc housing with precise thin walls, providing excellent electrical performance and shielding performance.
Our proprietary multi-slide die-casting process and excellent thin-wall capability make us the premier supplier of zinc components in various consumer electronic equipment.
The castability, wear-resistance, and structural integrity of zinc alloy make it ideal for highly complex shapes in the automotive safety and electronics industries.