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What Is Die Casting Zinc Alloy

Zinc Alloys Die Casting

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.

Zinc Alloy Characteristics
  • High strength and hardness
  • Excellent conductivity
  • 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
  • Fully recyclable
Zamak 2

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

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

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

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

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

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

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.
Zinc Die Casting Application

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.


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