aluminum sheet metal fabrication.Cost Theory of Aluminum Alloy Die Casting and Zinc Alloy Die Casting

　　1. Comparing material prices

　　The prices of zinc alloy and aluminum alloy die-casting are similar, with zinc alloy having a specific gravity about 2.5 times that of aluminum alloy, and the prices are comparable. Therefore, in terms of material cost, zinc alloy is two to three times more expensive than aluminum alloy.

　　2. Material performance comparison

　　Because zinc alloy has much better strength, hardness, and formability than aluminum alloy. If your product surface needs to be polished and electroplated, and requires high appearance quality, then you have to use zinc alloy. It is difficult to achieve high surface quality requirements for aluminum alloy materials because aluminum alloy die-casting performance is poor, and there are many pores on the surface of the product, resulting in poor surface quality after electroplating.

　　Zinc alloy die-casting has good performance and many advantages. Zinc alloy has a low melting point, a small solidification temperature range, is easy to fill and shape, and has a small tendency for shrinkage. It can be used to die-cast precision parts with complex shapes and thin walls. The casting surface is smooth and the dimensional accuracy is high; The pouring temperature is low, the mold has a long service life, is not easy to stick to the mold, and does not corrode the mold. Moreover, zinc alloy has high mechanical properties at room temperature, especially good compressive and wear resistance. Zinc alloy die-casting can accept various surface treatments well, such as electroplating, spraying, painting, etc.

　　3. Comparison of mold prices

　　Generally speaking, the prices of molds used in zinc alloy die-casting and aluminum alloy die-casting are different. Zinc alloy die-casting is not easy to stick to the mold and does not corrode the mold, so the price of molds used in zinc alloy die-casting is also cheaper. On the other hand, aluminum alloy die-casting requires better mold materials and higher prices due to its easy sticking to the mold and corrosion to the metal crucible

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