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Zinc alloy die-casting is usually composed of 96% zinc, 4% aluminum, in addition to copper and magnesium. The other silicon, iron, cadmium, tin, lead, etc. are considered as impurities.
Pressure die-cast zinc-aluminum alloy, the aluminum content can be refined inside the crystal particles, strengthening the strength of the casting, but also can reduce the molten zinc mold black metal erosion, with the increase of aluminum content, castings strong plating and impact resistance worth To significantly improve, but aluminum is higher than 4.5%, the impact toughness decreased. If the surface of the die castings need to be electroplated, such as nickel-plated chrome, the high aluminum content causes poor adhesion, and the ordinary zinc alloy electroplating process can not be well applied to the high-aluminum plated parts.
Copper used to improve its mechanical properties, but also can improve the strength and hardness of alloy castings, but not higher than 1.5%.
Trace amounts of magnesium 0.01% ~ 0.04%, so that zinc-aluminum alloy with creep resistance.
The presence of other impurities such as silicon, iron, cadmium, tin and lead will cause intergranular corrosion of the zinc alloy castings when they are exposed to corrosive environments, and the iron in them is harder iron-aluminum compounds with aluminum which gives Plating before machining and grinding and polishing difficulties.