The four zinc alloys used to make die cast components are Alloys 2, 3 and 5, as well as ZA 8. Analyzing the properties of these alloys is possible only following the identification of the product’s main characteristics. Following is a look in detail at the properties of zinc alloys.
Castability
The above-mentioned alloys have excellent castability, which is precisely the feature making them suitable for the hot chamber zinc die casting process. High castability levels let die casting companies produce parts characterized by extremely thin walls. These parts are lighter than those made with other metals. Due to the option these alloys bring of achieving minimum thickness, die casters also stand to gain significant cost savings when using one of them.
Resistance and Hardness
Alloys 2 and ZA 8 have the highest resistance as well as hardness. Zinc Alloy 2 has a high percentage of copper, giving it a particular resistance. In contrast, ZA 8 is relatively harder and more resistant thanks to the markedly high aluminum percentage. Therefore, these alloys are ideal for the making of parts which require great hardness and resistance but do not demand a specific dimensional parameter.
Dimensional Stability
In contrast, products that require dimensional stabilities have to be made with Alloys 3 or 5. These alloys have the right copper amount to make sure of good resistance while assuring stability over a period of time. They are a very good choice for the manufacture of parts with extremely complex shapes and allow minimum dimensional shrinkage. Thanks to the balance between dimensional stability and resistance, Alloys 3 and 5 are the most widely used ones in North America and the continent of Europe, respectively.
Creep Performance
When it comes to creep performance, ZA8 and Alloy 2 are the most efficient options. However, Alloy 5 also has fine creep performance, which is better than that of Zinc Alloy 3. Consequently, Alloy 5 is a more suitable choice to be used in die casting at high temperatures and under continuous pressure.
Surface Treatment
All the alloys mentioned at the beginning of this post are suitable for surface treatments. The high fluidities of these four alloys, which are all part of the ZAMAK family, allow die casters to apply different kinds of finishes. Zinc parts can be worked to achieve just about any kind of surface finish preferred by the client.