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First, the characteristics of the zinc alloy 1. The relatively high specific gravity. 2. casting performance, or complex die-cast shapes, thin wall precision castings, smooth surface. 3. can be surface treatment: electroplating, painting, painting, polishing and grinding. The melting and do not smoke when iron-casting, pressure-type non-corrosive, non-stick mold. 5. Have a good room temperature mechanical properties and wear resistance. 6. The low melting point, melting at 385 ℃, easy casting. Use process issues to be aware of: 1. poor corrosion resistance. When the alloy composition of impurity elements such as lead, cadmium, tin than the standard time, resulting in deformation of casting aging, expressed as a volume swell, mechanical properties, especially ductility decreased significantly, a long time or even rupture. Lead, tin, cadmium zinc alloys solubility is very small, and therefore focused on the grain boundaries become the cathode, aluminum-rich solid solution of an anode, in water vapor (electrolyte) presence of conditions to foster intergranular electrochemical corrosion. Casting due to intergranular corrosion and aging. 2. Organization of aging effect of zinc alloy mainly containing Al and Cu, Zn-containing zinc-rich solid solution and Al-rich solid solution formed, their solubility decreases with temperature drop. However, due to the solidification casting speed is extremely fast, and therefore to room temperature, the solubility of solid solution is substantially saturated.
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