What should we pay attention to when using zinc alloy die casting?


Date:

2021-07-12

What should I pay attention to when using zinc alloy die casting? Zinc alloy is based on zinc, adding aluminum, copper, magnesium, cadmium, lead, titanium and other elements of the alloy. Zinc alloy has low melting point, good fluidity, easy welding, brazing and plastic processing, corrosion resistance in the atmosphere, easy recovery and remelting of deformed materials, but low creep strength, easy to change size due to natural aging. Melting, die casting or pressure machining.

What should we pay attention to when using zinc alloy die casting?

What should we pay attention to when usingzinc alloy die-casting? Zinc alloy is an alloy based on zinc, with aluminum, copper, magnesium, cadmium, lead, titanium and other elements added. Zinc alloy has low melting point, good fluidity, easy welding, brazing and plastic processing, corrosion resistance in the atmosphere, easy recovery and remelting of deformed materials, but low creep strength, easy to change size due to natural aging. Melting, die casting or pressure processing

1. Poor corrosion resistance. The solubility of lead, tin and cadmium in zinc alloy is low, and they concentrate at the grain boundary and become anions, while the aluminum rich solid solution becomes cations, which promotes intergranular electrochemical corrosion in the presence of water vapor (electrolyte). Die castings age due to intergranular corrosion

2. Aging effect

The microstructure of zinc alloy is mainly composed of zinc rich solid solution containing aluminum and copper and aluminum rich solid solution containing zinc, and its solubility decreases with the decrease of temperature. However, the solidification speed of die castings is fast, so the solubility of solid solution at room temperature is largely saturated. After a period of time, this supersaturation phenomenon will gradually ease, and the shape and size of the casting will change slightly

3. Zinc alloy die castings shall not be used at high and low temperatures (below 0 ° C). Zinc alloy has good mechanical properties at room temperature. However, the tensile strength at high temperature and impact strength at low temperature decreased significantly

4. The surface of zinc alloy die-casting parts has burrs due to insufficient clamping force, poor clamping, insufficient die strength, and high melting temperature. This phenomenon is called the front end of the product, which is often a post-processing process that enterprises need to face. It is mainly solved by hand grinding, hydrogen oxygen blasting and trillion diamond frozen shot blasting machine according to the product properties


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