Zinc alloys are alloys composed of other elements based on zinc. Commonly added alloying elements are aluminum, copper, magnesium, cadmium, lead, titanium and other low-temperature zinc alloys. Zinc alloy has low melting point, good fluidity, easy fusion welding, brazing and plastic processing, corrosion resistance in the atmosphere, and easy recycling and remelting of residual waste; however, the creep strength is low, and it is prone to dimensional changes caused by natural aging. Prepared by melting, die casting or pressure processing. According to the manufacturing process, it can be divided into cast zinc alloy and deformed zinc alloy. The main added elements of zinc alloys are aluminum, copper and magnesium. Zinc alloys can be divided into two types: deformation and casting zinc alloys according to the processing technology. Casting zinc alloys have good fluidity and corrosion resistance, and are suitable for die-casting instruments and auto parts casings. Wait.
Aluminum alloy is a general term for aluminum-based alloys.
The main alloying elements are copper, silicon, magnesium, zinc, manganese, and the secondary alloying elements are nickel, iron, titanium, chromium, lithium, etc. Aluminum alloy has low density, but relatively high strength, close to or surpassing high-quality steel, good plasticity, can be processed into various profiles, has excellent electrical conductivity, thermal conductivity and corrosion resistance, widely used in industry, second only to steel . Some aluminum alloys can be heat treated to obtain good mechanical properties, physical properties and corrosion resistance. Hard aluminum alloy belongs to AI-Cu-Mg system, generally contains a small amount of Mn, and can be strengthened by heat treatment. It is characterized by high hardness, but poor plasticity. Super hard aluminum belongs to the Al-Cu-Mg-Zn system, which can be strengthened by heat treatment. It is the aluminum alloy with the highest strength at room temperature, but it has poor corrosion resistance and fast softening at high temperature. Forged aluminum alloys are mainly Al-Zn-Mg-Si alloys. Although there are many types of elements added, the content is small, so they have excellent thermoplasticity and are suitable for forging, so they are also called forged aluminum alloys.
The differences in die casting technology are as follows:
Pros: Zinc Alloy
The performance of die-casting is relatively good, the melting point is low, the solidification temperature range is small, it is easy to fill and form, and the tendency of shrinkage cavities is small. It can die-cast precision parts with complex shapes and thin walls. The surface of the casting is smooth and the dimensional accuracy is high. Long, not easy to stick to the mold, and does not corrode the mold. Moreover, the mechanical properties of zinc alloy at room temperature are also high, especially the compression resistance and wear resistance are very good.
In terms of performance, it is much better than zinc alloy, has good die casting performance, electrical conductivity and thermal conductivity, and has good cutting performance.
Cons: Zinc Alloy
Aging phenomenon, the volume increases, the strength decreases, and if the time is too long, the die casting will be deformed or even broken.
Al-Si series alloys are easy to stick to molds, are corrosive to metal crucibles, have large volume shrinkage, and are prone to shrinkage cavities.