* Property Zinc alloy: an alloy mainly contains zinc with other elements added. Aluminum alloy: it is the most widely used non-ferrous metal material in industry. * Characteristic Zinc alloy: usually add low temperature alloy elements, such as: aluminum, copper, magnesium, cadmium, lead, titanium..etc. Zinc alloy has low melting point, good liquidity, easy welding, brazing and plastic processing, corrosion resistance in air, and the scrap material is easy to recycle and re-melt, but has low creep strength and it’s easy to getting deformation by natural aging. It’s made from melting method, die casting or pressure processing. Aluminum alloy: Aluminum alloy has low intensity, but the strength is relatively high, closing to or even better than high-quality steel. It has good plasticity, so can be made to all kinds of materials. Aluminum alloy has excellent properties of electrical conductivity, thermal conductivity and corrosion resistance. It is widely used in industry, rank only second to steel. * Differences in technology In processing, the temperature is different between two molten bath from two alloys. Temperature for Zinc alloy is more than 400℃, while temperature of aluminum alloy is more than 700℃. * Differences in processing machines. Although they are both called die casting machine, but machines need matching the materials, cannot be mixed. Differences in processing technology and parameter. * Differences in mechanical properties Hardness of Zinc alloy is 65-140. Strength of extension of Zinc alloy is 260-440. Hardness of Aluminum alloy is 45-90. Strength of extension of Aluminum alloy is 120-290. As a whole, the hardness of Zinc alloy is higher than that of Aluminum alloy, and also the strength of extension of Zinc alloy is higher than that of Aluminum alloy. * Difference in material composition Zinc alloy mainly contains zinc with other elements added, and usually add low temperature alloy elements, such as: aluminum, copper, magnesium, cadmium, lead, titanium..etc. Aluminum alloy contains aluminum, copper and magnesium, generally also contains a small amount of manganese.

* Advantages and disadvantages of Zinc alloy: * Advantages: die casting Zinc alloy has good liquidity and corrosion resistance. It suits for die casting instruments, automobile part shells…etc. Disadvantages: the common defect is bubbles on surface of die casted Zinc parts. * Advantages and disadvantages of Aluminum alloy: Advantages: Aluminum alloy has low intensity, but the strength is relatively high, closing to or even better than high-quality steel. It has good plasticity, so can be made to all kinds of materials. Aluminum alloy has excellent properties of electrical conductivity, thermal conductivity and corrosion resistance. It is widely used in industry, rank only second to steel. Disadvantages: in the process of aluminum die casting, defects may happen like shrinkage cavities, sand holes, porosity, and slag.

Electroplating is good for improving the beauty, density and corrosion resistance for die casted Zinc parts. Materials are commonly used for electroplating are: Nickel, Tin, Copper, Silver, and Gold. Before electroplate. Must check carefully to confirm whether the part surface is fine for electroplating. Parts are not suitable for electroplating if have defects such as loose, racks, air bubbles, cold lines, pinholes…etc.Other finish for parts such as polish and smooth need completed before electroplating, so it’s better to design even product structure and avoid great sags and crests, large planes and sharp edges in product designing and mould designing, which is easy for polishing parts. Painting can be used for decorations, protection, and signs. It can partially hide some defects on surface of die casted Zinc parts, to help products achieve better performance. In painting, the concentration, quantity should strictly follow operation standards to avoid defects such as orange grains, pinholes, matte, paint gathering, paint throwing…etc. Chemical film forming treatment,Chrome-plating can improve the corrosion resistance of die casted Zinc parts and add beauty on part surface. Chrome-plating forms a protection layer on part surface, which makes die casted Zinc parts more easier to be painted and colored. Electrostatic painting also can form a protection layer for die casted Zinc parts, and make parts more smooth, beautiful and better performance. It can also improve the property of corrosion resistance. Electrostatic painting process needs strictly follow the operating standards, must check devices carefully as required before painting, and need choose the best appropriate hanging locations, adjust the moving speed of die casted parts, strictly control the temperature, paint viscosity and amount, to make sure that each part is painted evenly.

Die casting mould lifetime depends on its mould material, manufacturing precision and maintenance methods. Generally the mould life of Zinc die casting mould is 100-150k shots from die casting companies, while die casting moulds from GREFEE can achieve mould life to 500k shots or even one million.

Here’re the reasons: firstly, we choose imported mould steel(ASSAB 8407 or ASSAB 8418) to manufacture mould, which greatly increase the mould life of Zinc die casting mould. Secondly, GREFEE values much on intensity and precision of die casting mould, strictly access and inspect each process, operate and maintain in time and in accurate way. The final step of maintain is also well done, inspect and clean mould regularly.Obviously, GREFEE’s careful work in die casting helps our customers save cost on mould and improve the mould life of Zinc die casting mould!

1.Dimensional accuracy. Whether the mould can die cast Zinc parts within required tolerances. 2.Die casting production efficiency. It means the time for one part die casted, the shorter time takes, the better quality and higher efficiency mould is. 3.Mould stability. Whether the Zinc die casting mould can keep casting ok parts, and keep stable and high efficient for long term, besides, not easy to damage. 4.Long lifetime die casting mould is surely the best financial return to customers. 5.Runners design of die casting mould. Die casted parts don’t have defects of flow marks or cracks. 5.Whether it is reasonable for die casting mould designing. It covers reasonable mould structures, reasonable gate locations, and die casting mould intensity as required. It also means reasonable arrangement of cooling runners of die casting mould, which is good for Zinc parts demold from die casting mould, and parts not stick to the mould. All of these requires years of experience in mould designing. GREFEE has several skilled mould designers who can design die casting mould with fast speed, lead time of mould making 10-15 days, seldom problems and quick processing.