Zinc alloy die casting attention points

Several problems should be paid attention to in the production of die-casting zinc alloy:

1. Control the alloy composition from the purchase of alloy ingots. The alloy ingots must be based on ultra-high-purity zinc, plus ultra-high-purity aluminum, magnesium, and copper alloy ingots. The supplier has strict composition standards. High-quality zinc alloy material is the guarantee for the production of high-quality castings.

2. The purchased alloy ingots must have a clean and dry stacking area to avoid white rust caused by prolonged exposure to moisture, or increased slag generation and metal loss due to contamination by factory dirt. A clean factory environment is useful for effective control of alloy composition.

3. The ratio of the new material to the returning material such as the nozzle should not exceed 50%. Generally, the new material: the old material = 70:30. Al and Mg gradually decrease in successive remelted alloys.

4. When the nozzle material is remelted, the remelting temperature must be strictly controlled not to exceed 430°C to avoid the loss of aluminum and magnesium.

5. Conditional die-casting plants should preferably use centralized melting furnaces to melt zinc alloys, so that the alloy ingots and the returning materials are evenly mixed, and the flux can be used more effectively, so that the alloy composition and temperature can be kept uniform and stable. Electroplating waste and fines should be furnaced separately.